Goncalo, R Abolins, M Achenbach, R Adragna, P Aielli, G Aleksandrov, E Aleksandrov, I Aloisio, A Alviggi, M G Amorim, A Anderson, K Andrei, V Anduaga, X Antonelli, S Aracena, I Ask, S Asquith, L Avolio, G Backlund, S Badescu, E Bahat Treidel, O Baines, J Barnett, B M Barria, P Bartoldus, R Batreanu, S Bauss, B Beck, H P Bee, C Bell, P Bell, W H Bellagamba, L Bellomo, M Ben Ami, S Bendel, M Benhammou, Ya Benslama, K Berge, D Berger, N Berry, T Bianco, M Biglietti, M Blair, R R Bogaerts, A Bohm, C Bold, T Booth, J R A Boscherini, D Bosman, M Boyd, J Brawn, I P Brelier, B Bressler, S Bruni, A Bruni, G Buda, S Burckhart-Chromek, D Buttar, C Camarri, P Campanelli, M Canale, V Caprini, M Caracinha, D Cardarelli, R Carlino, G Casadei, D Casado, M P Cataldi, G Cerri, A Charlton, D G Chiodini, G Ciapetti, G Cimino, D Ciobotaru, M Clements, D Coccaro, A Coluccia, M R Conde-Muíño, P Constantin, S Conventi, F Corso-Radu, A Costa, M J Coura Torres, R Cranfield, R Cranmer, K Crone, G Curtis, C J Dam, M Damazio, D Davis, A O Dawson, I Dawson, J De Almeida Simoes, J De Cecco, S De Pedis, D De Santo, A DeAsmundis, R DellaPietra, M DellaVolpe, D Delsart, P -A Demers, S Di Mattia, A Di Ciaccio, A Di Girolamo, A Dionisi, C Djilkibaev, R Dobinson, Robert W Dobson, M Dogaru, M Dotti, A Dova, M Drake, G Dufour, M -A Eckweiler, S Ehrenfeld, W Eifert, T Eisenhandler, E F Ellis, Nick Emeliyanov, D Enoque Ferreira de Lima, D Ermoline, Y Eschrich, I Etzion, E Facius, K Falciano, S Farthouat, P Faulkner, P J W F Feng, E Ferland, J Ferrari, R Ferrer, M L Fischer, G Fonseca-Martin, T Francis, D Fukunaga, C Föhlisch, F Gadomski, S Garitaonandia Elejabarrieta, H Gaudio, G Gaumer, O Gee, C N P George, S Geweniger, C Giagu, S Gillman, A R Giusti, P Gorini, B Gorini, E Gowdy, S Grabowska-Bold, I Grancagnolo, F Grancagnolo, S Green, B Galllno, P Haas, S Haberichter, W Hadavand, H Haeberli, C Haller, J Hamilton, A Hanke, P Hansen, J R Hasegawa, Y Hauschild, M Hauser, R Head, S Hellman, S Hidvegi, A Hillier, S J Höcker, A Hrynóva, T Hughes-Jones, R Huston, J Iacobucci, G Idarraga, J Iengo, P Igonkina, O Ikeno, M Inada, M Ishino, M Iwasaki, H Izzo, V Jain, V Johansen, M Johns, K Joos, M Kadosaka, T Kajomovitz, E Kama, S Kanaya, N Kawagoe, K Kawamoto, T Kazarov, A Kehoe, R Khoriauli, G Kieft, G Kilvington, G Kirk, J Kiyamura, H Klofver, P Klous, S Kluge, E -E Kobayashi, T Kolos, S Kono, T Konstantinidis, N Korcyl, K Kordas, K Kotov, V Krasznahorkay, A Kubota, T Kugel, A Kuhn, D Kurashige, H Kurasige, H Kuwabara, T Kwee, R Landon, M Lankford, A LeCompte, T Leahu, L Leahu, M Ledroit, F Lehmann-Miotto, G Lei, X Lellouch, D Lendermann, V Levinson, L Leyton, M Li, S Liberti, B Lifshitz, R Lim, H Lohse, T Losada, M Luci, C Luminari, L Lupu, N Mahboubi, K Mahout, G Mapelli, L Marchese, F Martin, B Martin, B T Martínez, A Marzano, F Masik, J McMahon, T McPherson, R Medinnis, M Meessen, C Meier, K Meirosu, C Messina, A Migliaccio, A Mikenberg, G Mincer, A Mineev, M Misiejuk, A Mönig, K Monticelli, F Moraes, A Moreno, D Morettini, P Murillo Garcia, R Nagano, K Nagasaka, Y Negri, A Némethy, P Neusiedl, A Nisati, A Niwa, T Nomachi, M Nomoto, H Nozaki, M Nozicka, M Ochi, A Ohm, C Okumura, Y Omachi, C Osculati, B Oshita, H Osuna, C Padilla, C Panikashvili, N Parodi, F Pasqualucci, E Pastore, F Patricelli, S Pauly, T Pectu, M Perantoni, M Perera, V Perera, V J O Pérez, E Pérez-Réale, V Perrino, R Pessoa Lima Junior, H Petersen, J Petrolo, E Piegaia, R Pilcher, J E Pinto, F Pinzon, G Polini, A Pope, B Potter, C Prieur, D P F Primavera, M Qian, W Radescu, V Rajagopalan, S Renkel, P Rescigno, M Rieke, S Risler, C Riu, I Robertson, S Roda, C Rodríguez, D Rogriquez, Y Roich, A Romeo, G Rosati, S Ryabov, Yu Ryan, P Rühr, F Sakamoto, H Salamon, A Salvatore, D Sankey, D P C Santamarina, C Santamarina-Rios, C Santonico, R Sasaki, O Scannicchio, D Scannicchio, D A Schiavi, C Schlereth, J L Schmitt, K Scholtes, I Schooltz, D Schuler, G Schultz-Coulon, H -C Schäfer, U Scott, W Segura, E Sekhniaidze, G Shimbo, N Sidoti, A Silva, L Silverstein, S Siragusa, G Sivoklokov, S Sloper, J E Smizanska, M Solfaroli, E Soloviev, I Soluk, R Spagnolo, S Spila, F Spiwoks, R Staley, R J Stamen, R Stancu, S Steinberg, P Stelzer, J Stradling, A Strom, D Strong, J Su, D Sugaya, Y Sugimoto, T Sushkov, S Sutton, M Szymocha, T Takahashi, Y Takeda, H Takeshita, T Tanaka, S Tapprogge, S Tarem, S Tarem, Z Teixeira-Dias, P Thomas, J P Tokoshuku, K Tomoto, M Torrence, E Touchard, F Trefzger, T Tremblet, L Tripiana, M Usai, G Vachon, B Vandelli, W Vari, R Veneziano, S Ventura, A Vercesi, V Vermeulen, J Von Der Schmitt, J Wang, M Watkins, P M Watson, A Weber, P Wengler, T Werner, P Wheeler-Ellis, S Wickens, F Wiedenmann, W Wielers, M Wilkens, H Winklmeier, F Woehrling, E -E Wu, S -L Wu, X Xella, S Yamaguchi, Y Yamazaki, Y Yasu, Y Yu, M Zanello, L Zema, F Zhang, J Zhao, L Zobernig, H De Seixas, J M Dos Anjos, A Zur Nedden, M Ozcan, E Ünel, G J. Phys.: Conf. Ser. 10.1088/1742-6596/110/9/092013 092013 110 ATLAS Trigger HLT Early running 2008 2008 The ATLAS experiment is one of the two general-purpose experiments due to start operation soon at the Large Hadron Collider (LHC). The LHC will collide protons at a centre of mass energy of 14~TeV, with a bunch-crossing rate of 40~MHz. The ATLAS three-level trigger will reduce this input rate to match the foreseen offline storage capability of 100-200~Hz. This paper gives an overview of the ATLAS High Level Trigger focusing on the system design and its innovative features. We then present the ATLAS trigger strategy for the initial phase of LHC exploitation. Finally, we report on the valuable experience acquired through in-situ commissioning of the system where simulated events were used to exercise the trigger chain. In particular we show critical quantities such as event processing times, measured in a large-scale HLT farm using a complex trigger menu. Abolins, M Achenbach, R Adragna, P Aielli, G Aleksandrov, E Aleksandrov, I Aloisio, A Alviggi, M G Amorim, A Anderson, K Andrei, V Anduaga, X Antonelli, S Aracena, I Ask, S Asquith, L Avolio, G Backlund, S Badescu, E Bahat Treidel, O Baines, J Barnett, B M Barria, P Bartoldus, R Batreanu, S Bauss, B Beck, H P Bee, C Bell, P Bell, W H Bellagamba, L Bellomo, M Ben Ami, S Bendel, M Benhammou, Ya Benslama, K Berge, D Berger, N Berry, T Bianco, M Biglietti, M Blair, R R Bogaerts, A Bohm, C Bold, T Booth, J R A Boscherini, D Bosman, M Boyd, J Brawn, I P Brelier, B Bressler, S Bruni, A Bruni, G Buda, S Burckhart-Chromek, D Buttar, C Camarri, P Campanelli, M Canale, V Caprini, M Caracinha, D Cardarelli, R Carlino, G Casadei, D Casado, M P Cataldi, G Cerri, A Charlton, D G Chiodini, G Ciapetti, G Cimino, D Ciobotaru, M Clements, D Coccaro, A Coluccia, M R Conde-Muíño, P Constantin, S Conventi, F Corso-Radu, A Costa, M J Coura Torres, R Cranfield, R Cranmer, K Crone, G Curtis, C J Dam, M Damazio, D Davis, A O Dawson, I Dawson, J De Almeida Simoes, J De Cecco, S De Pedis, D De Santo, A DeAsmundis, R DellaPietra, M DellaVolpe, D Delsart, P A Demers, S Demirkoz, B Di Mattia, A Di Ciaccio, A Di Girolamo, A Dionisi, C Djilkibaev, R Dobinson, Robert W Dobson, M Dogaru, M Dotti, A Dova, M Drake, G Dufour, M -A Eckweiler, S Ehrenfeld, W Eifert, T Eisenhandler, E F Ellis, Nick Emeliyanov, D Enoque Ferreira de Lima, D Ermoline, Y Eschrich, I Etzion, E Facius, K Falciano, S Farthouat, P Faulkner, P J W F Feng, E Ferland, J Ferrari, R Ferrer, M L Fischer, G Fonseca-Martin, T Francis, D Fukunaga, C Föhlisch, F Gadomski, S Garitaonandia Elejabarrieta, H Gaudio, G Gaumer, O Gee, C N P George, S Geweniger, C Giagu, S Gillman, A R Giusti, P Goncalo, R Gorini, B Gorini, E Gowdy, S Grabowska-Bold, I Grancagnolo, F Grancagnolo, S Green, B Galllno, P Haas, S Haberichter, W Hadavand, H Haeberli, C Haller, J Hamilton, A Hanke, P Hansen, J R Hasegawa, Y Hauschild, M Hauser, R Head, S Hellman, S Hidvegi, A Hillier, S J Höcker, A Hrynóva, T Hughes-Jones, R Huston, J Iacobucci, G Idarraga, J Iengo, P Igonkina, O Ikeno, M Inada, M Ishino, M Iwasaki, H Izzo, V Jain, V Johansen, M Johns, K Joos, M Kadosaka, T Kajomovitz, E Kama, S Kanaya, N Kawagoe, K Kawamoto, T Kazarov, A Kehoe, R Khoriauli, G Kieft, G Kilvington, G Kirk, J Kiyamura, H Klofver, P Klous, S Kluge, E E Kobayashi, T Kolos, S Kono, T Konstantinidis, N Korcyl, K Kordas, K Kotov, V Krasznahorkay, A Kubota, T Kugel, A Kuhn, D Kurashige, H Kurasige, H Kuwabara, T Kwee, R Landon, M Lankford, A LeCompte, T Leahu, L Leahu, M Ledroit, F Lehmann-Miotto, G Lei, X Lellouch, D Lendermann, V Levinson, L Leyton, M Li, S Liberti, B Lifshitz, R Lim, H Lohse, T Losada, M Luci, C Luminari, L Lupu, N Mahboubi, K Mahout, G Mapelli, L Marchese, F Martin, B Martin, B T Martínez, A Marzano, F Masik, J McMahon, T McPherson, R Medinnis, M Meessen, C Meier, K Meirosu, C Messina, A Migliaccio, A Mikenberg, G Mincer, A Mineev, M Misiejuk, A Mönig, K Monticelli, F Moraes, A Moreno, D Morettini, P Murillo Garcia, R Nagano, K Nagasaka, Y Negri, A Némethy, P Neusiedl, A Nisati, A Niwa, T Nomachi, M Nomoto, H Nozaki, M Nozicka, M Ochi, A Ohm, C Okumura, Y Omachi, C Osculati, B Oshita, H Osuna, C Padilla, C Panikashvili, N Parodi, F Pasqualucci, E Pastore, F Patricelli, S Pauly, T Pectu, M Perantoni, M Perera, V Perera, V J O Pérez, E Pérez-Réale, V Perrino, R Pessoa Lima Junior, H Petersen, J Petrolo, E Piegaia, R Pilcher, J E Pinto, F Pinzon, G Polini, A Pope, B Potter, C Prieur, D P F Primavera, M Qian, W Radescu, V Rajagopalan, S Renkel, P Rescigno, M Rieke, S Risler, C Riu, I Robertson, S Roda, C Rodríguez, D Rogriquez, Y Roich, A Romeo, G Rosati, S Ryabov, Yu Ryan, P Rühr, F Sakamoto, H Salamon, A Salvatore, D Sankey, D P C Santamarina, C Santamarina-Rios, C Santonico, R Sasaki, O Scannicchio, D Scannicchio, D A Schiavi, C Schlereth, J L Schmitt, K Scholtes, I Schooltz, D Schuler, G Schultz-Coulon, H -C Schäfer, U Scott, W Segura, E Sekhniaidze, G Shimbo, N Sidoti, A Silva, L Silverstein, S Siragusa, G Sivoklokov, S Sloper, J E Smizanska, M Solfaroli, E Soloviev, I Soluk, R Spagnolo, S Spila, F Spiwoks, R Staley, R J Stamen, R Stancu, S Steinberg, P Stelzer, J Stradling, A Strom, D Strong, J Su, D Sugaya, Y Sugimoto, T Sushkov, S Sutton, M Szymocha, T Takahashi, Y Takeda, H Takeshita, T Tanaka, S Tapprogge, S Tarem, S Tarem, Z Teixeira-Dias, P Thomas, J P Tokoshuku, K Tomoto, M Torrence, E Touchard, F Trefzger, T Tremblet, L Tripiana, M Usai, G Vachon, B Vandelli, W Vari, R Veneziano, S Ventura, A Vercesi, V Vermeulen, J Von Der Schmitt, J Wang, M Watkins, P M Watson, A Weber, P Wengler, T Werner, P Wheeler-Ellis, S Wickens, F Wiedenmann, W Wielers, M Wilkens, H Winklmeier, F Woerling, E E Wu, S -L Wu, X Xella, S Yamaguchi, Y Yamazaki, Y Yasu, Y Yu, M Zanello, L Zema, F Zhang, J Zhao, L Zobernig, H De Seixas, J M Dos Anjos, A Zur Nedden, M Ozcan, E Ünel, G J. Phys.: Conf. Ser. 10.1088/1742-6596/119/2/022014 022014 119 Trigger Commissioning ATLAS HLT Level-1 Cosmic ray 2008 2008 The ATLAS detector at CERN's LHC will be exposed to proton-proton collisions from beams crossing at 40 MHz. At the design luminosity there are roughly 23 collisions per bunch crossing. ATLAS has designed a three-level trigger system to select potentially interesting events. The first-level trigger, implemented in custom-built electronics, reduces the incoming rate to less than 100 kHz with a total latency of less than 2.5$\mu$s. The next two trigger levels run in software on commercial PC farms. They reduce the output rate to 100-200 Hz. In preparation for collision data-taking which is scheduled to commence in May 2008, several cosmic-ray commissioning runs have been performed. Among the first sub-detectors available for commissioning runs are parts of the barrel muon detector including the RPC detectors that are used in the first-level trigger. Data have been taken with a full slice of the muon trigger and readout chain, from the detectors in one sector of the RPC system, to the second-level trigger algorithms and the data-acquisition system. The system is being prepared to include the inner-tracking detector in the readout and second-level trigger. We will present the status and results of these cosmic-ray based commissioning activities. This work will prove to be invaluable not only during the commissioning phase but also for cosmic-ray data-taking during the normal running for detector performance studies. Buttar, C M Clements, D Dawson, I Moraes, A Acta Phys. Pol. B 433-41 35 minimum-bias-events MC-tuning LHC underlying-event-data Tevatron PYTHIA-multiparton-model PHOJET central-jet Higgs-search vector- boson-fusion-channel QCD 2004 2004 Minimum bias and underlying event data from the SppmacronS and the Tevatron have been compared to PYTHIA and PHOJET simulations. The data have been used to tune the PYTHIA multiparton model and good agreement is found. PHOJET also gives good agreement. Predictions are made for the multiplicities in minimum bias and the underlying events at the LHC. PYTHIA predicts increases by factors of order two to three from Tevatron energies, while PHOJET predicts more modest increases by a factor of 1.5. The effect of different levels of underlying event activity on the central jet veto used in Higgs searches in the vector boson fusion channel is investigated. Albrow, Michael G. Begel, M. Bourilkov, D. Campanelli, M. Chlebana, F. De Roeck, A. Dittmann, J.R. Ellis, S.D. Field, B. Field, R. Gallinaro, M. Giele, W. Goulianos, Konstantin A. Group, R.C. Hatakeyama, K. Hubacek, Z. Huston, J. Kilgore, W. Kluge, T. Lee, S.W. Moraes, A. Mrenna, S. Olness, F. Proudfoot, J. Rabbertz, K. Royon, C. Sjostrand, T. Skands, Peter Z. Smith, J. Tung, W.K. Whalley, M.R. Wobisch, M. Zielinski, M. 2006 2006 The experiments at Run 2 of the Tevatron have each accumulated over 1 inverse femtobarn of high-transverse momentum data. Such a dataset allows for the first precision (i.e. comparisons between theory and experiment at the few percent level) tests of QCD at a hadron collider. While the Large Hadron Collider has been designed as a discovery machine, basic QCD analyses will still need to be performed to understand the working environment. The Tevatron-for-LHC workshop was conceived as a communication link to pass on the expertise of the Tevatron and to test new analysis ideas coming from the LHC community. The TeV4LHC QCD Working Group focussed on important aspects of QCD at hadron colliders: jet definitions, extraction and use of Parton Distribution Functions, the underlying event, Monte Carlo tunes, and diffractive physics. This report summarizes some of the results achieved during this workshop. Buttar, C Dittmaier, S Drollinger, V Frixione, Stefano Nikitenko, A Abdullin, S W S Accomando, E Acosta, D Arbuzov, A Ball, R D Ballestrero, A Bartalini, P Baur, U Belhouari, A Belov, S Belyaev, A Benedetti, D Binoth, T Bolognesi, S Bondarenko, S Boos, E E Boudjema, F Bredenstein, A Bunichev, V E Buttar, C Campbell, J M Calame, C C Catani, S Cavanaugh, R J Ciccolini, M Collins, J Cooper-Sarkar, A M Corcella, Gennaro Cucciarelli, S Davatz, G Del Duca, V Denner, A D'Hondt, J Drozdetsky, A A Dudko, L V Dührssen, M Frazier, R Fujimoto, J Gascon-Shotkin, S Gehrmann, T Ridder, A G D Giammanco, A Giolo-Nicollerat, Anne Sylvie Glover, E W N Godbole, Rohini M Grau, A Grazzini, M Guillet, J P Gusev, A Harlander, R Hegde, R Marlen-Heinrich, G Heyninck, J Huston, J Ishikawa, T Kalinowski, A Kaneko, T Kato, K Kauer, N Kilgore, W Kirsanov, M Korytov, A Krämer, M Kulesza, A Kurihara, Y Lehti, S Magnea, L Mahmoudi, F Maina, E Maltoni, F Mariotti, C Mellado, B Mercier, D Mitselmakher, G Montagna, G Moraes, A Moretti, M Moretti, S Nakano, I Nason, P Nicrosini, O Nolten, M R Olness, F Pakhotin, Y Pancheri, G Piccinini, F Pilon, E Pittau, R Pozzorini, Stefano Pumplin, J Quayle, W 2005 2005 This Report summarises the activities of the "SM and Higgs" working group for the Workshop "Physics at TeV Colliders", Les Houches, France, 2-20 May, 2005. On the one hand, we performed a variety of experimental and theoretical studies on standard candles (such as W, Z, and ttbar production), treating them either as proper signals of known physics, or as backgrounds to unknown physics; we also addressed issues relevant to those non-perturbative or semi-perturbative ingredients, such as Parton Density Functions and Underlying Events, whose understanding will be crucial for a proper simulation of the actual events taking place in the detectors. On the other hand, several channels for the production of the Higgs, or involving the Higgs, have been considered in some detail. The report is structured into four main parts. The first one deals with Standard Model physics, except the Higgs. A variety of arguments are treated here, from full simulation of processes constituting a background to Higgs production, to studies of uncertainties due to PDFs and to extrapolations of models for underlying events, from small-$x$ issues to electroweak corrections which may play a role in vector boson physics. The second part of the report treats Higgs physics from the point of view of the signal. In the third part, reviews are presented on the current status of multi-leg, next-to-leading order and of next-to-next-to-leading order QCD computations. Finally, the fourth part deals with the use of Monte Carlos for simulation of LHC physics. Buttar, C M Butterworth, J M Field, R D Gustafson, G Hoeche, S Krauss, F Moraes, A Seymour, Michael H Schälicke, A Sjöstrand, T Szczypka, P 10.5170/CERN-2005-014.192 2005 2005 Moraes, A Buttar, C Clements, D Skillicorn, I O jets, azimuthal decorrelation, reconstructed events QCD 2005 2005 Dijet azimuthal decorrelations are investigated in this report. We present a study on how well the event generators PYTHIA, HERWIG and HERWIG+JIMMY describe some of the recent measurements on dijet azimuthal decorrelations made by D0. We predict the correlations in the azimuthal angle between the two largest transverse momentum jets in the central rapidity for LHC inclusive dijet event samples. Reconstructed dijet azimuthal decorrelation distributions for simulated jet events at ATLAS (Rome samples) are shown to reproduce the MC event generator predictions. Campabadal, F Fleta, C Key, M Lozano, M Martínez, C Pellegrini, G Rafí, J M Ullán, M Johansen, L Pommeresche, B Stugu, B Ciocio, A Fadeev, V Gilchriese, M G D Haber, C Siegrist, J Spieler, H Vu, C Bell, P J Charlton, D G Dowell, John D Gallop, B J Homer, R J Jovanovic, P Mahout, G McMahon, T J Wilson, J A Barr, A J Carter, J R Fromant, B P Goodrick, M J Hill, J C Lester, C G Palmer, M J Parker, M A Robinson, D Sabetfakhri, A Shaw, R J Anghinolfi, F Chesi, Enrico Guido Chouridou, S Fortin, R Grosse-Knetter, J Gruwé, M Ferrari, P Jarron, P Kaplon, J MacPherson, A Niinikoski, T O Pernegger, H Roe, S Rudge, A Ruggiero, G Wallny, R Weilhammer, P Bialas, W Dabrowski, W Grybos, P Koperny, S Blocki, J Brückman, P Gadomski, S Godlewski, J Górnicki, E Malecki, P Moszczynski, A Stanecka, E Stodulski, M Szczygiel, R Turala, M Wolter, M Ahmad, A Benes, J Carpentieri, C Feld, L Ketterer, C Ludwig, J Meinhardt, J Runge, K Mikulec, B Mangin-Brinet, M D'Onofrio, M Donega, M Moêd, S Sfyrla, A Ferrère, D Clark, A G Perrin, E Weber, M Bates, R L Cheplakov, A P Saxon, D H O'Shea, V Smith, K M Iwata, Y Ohsugi, T Kohriki, T Kondo, T Terada, S Ujiie, N Ikegami, Y Unno, Y Takashima, R Brodbeck, T Chilingarov, A G Hughes, G Ratoff, P Sloan, T Allport, P P Casse, G L Greenall, A Jackson, J N Jones, T J King, B T Maxfield, S J Smith, N A Sutcliffe, P Vossebeld, Joost Herman Beck, G A Carter, A A Lloyd, S L Martin, A J Morris, J Morin, J Nagai, K Pritchard, T W Anderson, B E Butterworth, J M Fraser, T J Jones, T W Lane, J B Postranecky, M Warren, M R M Cindro, V Kramberger, G Mandic, I Mikuz, M Duerdoth, I P Freestone, J Foster, J M Ibbotson, M Loebinger, F K Pater, J Snow, S W Thompson, R J Atkinson, T M Bright, G Kazi, S Lindsay, S Moorhead, G F Taylor, G N Bachindgagyan, G Baranova, N Karmanov, D Merkine, M Andricek, L Bethke, Siegfried Kudlaty, J Lutz, Gerhard Moser, H G Nisius, R Richter, R Schieck, J Cornelissen, T Gorfine, G W Hartjes, F G Hessey, N P de Jong, P Muijs, A J M Peeters, S J M Tomeda, Y Tanaka, R Nakano, I Dorholt, O Danielsen, K M Huse, T Sandaker, H Stapnes, S Bargassa, Pedrame Reichold, A Huffman, T Nickerson, R B Weidberg, A Doucas, G Hawes, B Lau, W Howell, D Kundu, N Wastie, R Böhm, J Mikestikova, M Stastny, J Broklová, Z Broz, J Dolezal, Z Kodys, P Kubík, P Reznicek, P Vorobel, V Wilhelm, I Chren, D Horazdovsky, T Linhart, V Pospísil, S Sinor, M Solar, M Sopko, B Stekl, I Ardashev, E N Golovnya, S N Gorokhov, S A Kholodenko, A G Rudenko, R E Ryadovikov, V N Vorobev, A P Adkin, P J Apsimon, R J Batchelor, L E Bizzell, J P Booker, P Davis, V R Easton, J M Fowler, C Gibson, M D Haywood, S J MacWaters, C Matheson, J P Matson, R M McMahon, S J Morris, F S Morrissey, M Murray, W J Phillips, P W Tyndel, M Villani, E G Dorfan, D E Grillo, A A Rosenbaum, F Sadrozinski, H F W Seiden, A Spencer, E Wilder, M Booth, P Buttar, C M Dawson, I Dervan, P Grigson, C Harper, R Moraes, A Peak, L S Varvell, K E Chu Ming Lee Hou Li Shing Lee Shih Chang Teng Ping Kun Wan Chang Chun Hara, K Kato, Y Kuwano, T Minagawa, M Sengoku, H Bingefors, N Brenner, R Ekelöf, T J C Eklund, L Bernabeu, J Civera, J V Costa, M J Fuster, J García, C García, J E González-Sevilla, S Lacasta, C Llosa, G Martí i García, S Modesto, P Sánchez, J Sospedra, L Vos, M Fasching, D González, S Jared, R C Charles, E Nucl. Instrum. Methods Phys. Res., A 10.1016/j.nima.2004.08.133 384-407 538 2005 2005 The design and technology of the silicon strip detector modules for the Semiconductor Tracker (SCT) of the ATLAS experiment have been finalised in the last several years. Integral to this process has been the measurement and verification of the tracking performance of the different module types in test beams at the CERN SPS and the KEK PS. Tests have been performed to explore the module performance under various operating conditions including detector bias voltage, magnetic field, incidence angle, and state of irradiation up to 3 multiplied by 1014 protons per square centimetre. A particular emphasis has been the understanding of the operational consequences of the binary readout scheme. Moraes, A Buttar, C Dawson, I Eur. Phys. J. C 10.1140/epjc/s10052-007-0239-1 435-466 50 2 Minimum bias Underlying event Monte Carlo generator LHC predictions MCGENERATORS 2007 2007 In this report we investigate the models employed by PYTHIA and PHOJET Monte Carlo event generators used to describe soft interactions in hadron-hadron collisions. The prime aim of this study is to predict minimum bias and underlying event levels of particle production and event activity for the LHC as accurately as these models allow us, thus providing a good description of the event environment in simulations. Focusing on a wide range of measurements dominated by soft interactions in proton-proton and proton-anti-proton collisions, one of the aims of this study is to check the consistency of these models when compared to data and evaluate how accurate their descriptions of low-pT processes are. Based on comparisons to a wide range of minimum bias and underlying event data we present a tuning for PYTHIA6.214 and compare it to other PYTHIA tunings. Our proposed tuning for PYTHIA6.214 has been used for the ATLAS Data Challenge productions. Moraes, A Buttar, C Clements, D Underlying event, Reconstructed data, Jets QCD 2005 2005 In this report we investigate measurements of the underlying event in jet events at ATLAS. Reconstructed QCD jet samples in separate pT bins produced for jet calibration (Rome samples) are used in this study. We show that reconstructed track distributions for the underlying event reproduce the MC event generator predictions. Moraes, A Buttar, C Dawson, I Minimum bias Underlying event Monte Carlo modelling LHC predictions MCGENERATORS 2005 2005 In this report we investigate the models employed by PYTHIA and PHOJET Monte Carlo event generators used to describe soft interactions in hadron-hadron collisions. The prime aim of this study is to predict minimum bias and underlying event levels of particle production and event activity for the LHC as accurately as these models allow us, thus providing indispensable information for simulations. Focusing on a wide range of measurements dominated by soft interactions in proton-proton and proton-anti-proton collisions, one of the aims of this study is to check the consistency of these models when compared to data and evaluate how efficient their descriptions of low-pT processes are. Based on comparisons to a wide range of minimum bias and underlying event data we present a tuning for PYTHIA6.214 and compare it to other PYTHIA tunings. Dawson, I Buttar, C Moraes, A Czechoslov. J. Phys. A221-A228 54 2004 2004 Dawson, I Moraes, A Buttar, C Cindro, V Mandic, I Nucl. Instrum. Methods Phys. Res., A 10.1016/j.nima.2003.06.007 422-438 515 2003 2003 One of the consequences of operating detector systems in harsh radiation environments will be radioactivation of the components. This will certainly be true in experiments such as ATLAS and CMS, which are currently being built to exploit the physics potential at CERN's Large Hadron Collider. If the levels of radioactivity and corresponding dose rates are significant, then there will be implications for any access or maintenance operations. This paper presents predictions for the radioactivation of ATLAS's Semi- Conductor Tracker (SCT) barrel system, based on both calculations and measurements. It is shown that both neutron capture and high-energy hadron reactions must be taken into account. The predictions also show that the SCT barrel-module should not pose any serious radiological problems after operation in high radiation environments. Sturrock, R Bischof, R Epp, B Ghete, V M Kuhn, D Mello, A G Caron, B Vetterli, M C Karapetian, G V Martens, K Agarwal, A Poffenberger, P R McPherson, R A Sobie, R J Amstrong, S Benekos, N C Boisvert, V Boonekamp, M Brandt, S Casado, M P Elsing, M Gianotti, F Goossens, L Grote, M Hansen, J B Mair, K Nairz, A Padilla, C Poppleton, A Poulard, G Richter-Was, Elzbieta Rosati, S Schörner-Sadenius, T Wengler, T Xu, G F Ping, J L Chudoba, J Kosina, J Lokajícek, M Svec, J Tas, P Hansen, J R Lytken, E Nielsen, J L Wäänänen, A Tapprogge, Stefan Calvet, D Albrand, S Collot, J Fulachier, J Ledroit-Guillon, F Ohlsson-Malek, F Viret, S Wielers, M Bernardet, K Corréard, S Rozanov, A De Vivie de Régie, J B Arnault, C Bourdarios, C Hrivnác, J Lechowski, M Parrour, G Perus, A Rousseau, D Schaffer, A Unal, G Derue, F Chevalier, L Hassani, S Laporte, J F Nicolaidou, R Pomarède, D Virchaux, M Nesvadba, N Baranov, S Putzer, A Khonich, A Duckeck, G Schieferdecker, P Kiryunin, A E Schieck, J Lagouri, T Duchovni, E Levinson, L Schrager, D Negri, G Bilokon, H Spogli, L Barberis, D Parodi, F Cataldi, G Gorini, E Primavera, M Spagnolo, S Cavalli, D Heldmann, M Lari, T Perini, L Rebatto, D Resconi, S Tatarelli, F Vaccarossa, L Biglietti, M Carlino, G Conventi, F Doria, A Merola, L Polesello, G Vercesi, V De Salvo, A Di Mattia, A Luminari, L Nisati, A Reale, M Testa, M Farilla, A Verducci, M Cobal, M Santi, L Hasegawa, Y Ishino, M Mashimo, T Matsumoto, H Sakamoto, H Tanaka, J Ueda, I Bentvelsen, Stanislaus Cornelius Maria Fornaini, A Gorfine, G Groep, D Templon, J Köster, L J Konstantinov, A Myklebust, T Ould-Saada, F Bold, T Kaczmarska, A Malecki, P Szymocha, T Turala, M Kulchitskii, Yu A Khoreauli, G Gromova, N Tsulaia, V Minaenko, A A Rudenko, R Slabospitskaya, E Solodkov, A Gavrilenko, I Nikitine, N Sivoklokov, S Yu Toms, K Zalite, A Zalite, Yu Kervesan, B Bosman, M González, S Sánchez, J Salt, J Andersson, N Nixon, L Eerola, Paule Anna Mari Kónya, B Smirnova, O G Sandgren, A Ekelöf, T J C Ellert, M Gollub, N Hellman, S Lipniacka, A Corso-Radu, A Pérez-Réale, V Lee, S C CLin, S C Ren, Z L Teng, P K Faulkner, P J W O'Neale, S W Watson, A Brochu, F Lester, C Thompson, S Kennedy, J Bouhova-Thacker, E Henderson, R Jones, R Kartvelishvili, V G Smizanska, M Washbrook, A J Drohan, J Konstantinidis, N P Moyse, E Salih, S Loken, J Baines, J T M Candlin, D Candlin, R Clifft, R Li, W McCubbin, N A George, S Lowe, A Buttar, C Dawson, I Moraes, A Tovey, Daniel R Gieraltowski, J Malon, D May, E LeCompte, T J Vaniachine, A Adams, D L Assamagan, Ketevi A Baker, R Deng, W Fine, V Fisyak, Yu Gibbard, B Ma, H Nevski, P Paige, F Rajagopalan, S Smith, J Undrus, A Wenaus, T Yu, D Calafiura, P Canon, S Costanzo, D Hinchliffe, Ian Lavrijsen, W Leggett, C Marino, M Quarrie, D R Sakrejda, I Stravopoulos, G Tull, C Loch, P Youssef, S Shank, J T Engh, D Frank, E Sen-Gupta, A Gardner, R Meritt, F Smirnov, Y Huth, J Grundhoefer, L Luehring, F C Goldfarb, S Severini, H Skubic, P L Gao, Y Ryan, T De, K Sosebee, M McGuigan, P Ozturk, N Nucl. Instrum. Methods Phys. Res., A 2004 2004 The ATLAS Collaboration at CERN is preparing for the data taking and analysis at the LHC that will start in 2007. Therefore, a series of Data Challenges was started in 2002 whose goals are the validation of the Computing Model, of the complete software suite, of the data model, and to ensure the correctness of the technical choices to be made for the final offline computing environment. A major feature of the first Data Challenge (DC1) was the preparation and the deployment of the software required for the production of large event samples as a worldwide distributed activity. It should be noted that it was not an option to "run the complete production at CERN" even if we had wanted to; the resources were not available at CERN to carry out the production on a reasonable time-scale. The great challenge of organising and carrying out this large-scale production at a significant number of sites around the world had therefore to be faced. However, the benefits of this are manifold: apart from realising the required computing resources, this exercise created worldwide momentum for ATLAS computing as a whole. This report describes in detail the main steps carried out in DC1 and what has been learned form them as a step towards a computing Grid for the LHC experiments. Dawson, I Buttar, C M Mokhov, N V Moraes, A Shupe, M A Nucl. Instrum. Methods Phys. Res., A 10.1016/S0168-9002(03)01861-8 219-232 510 2003 2003 The physics requirements of future hadron-collider experiments require very high collision rates, leading to harsh radiation environments never before confronted in large-scale high-energy physics experiments. The high levels of radiation backgrounds becomes a major design criterion for such experiments. Considering the enormous cost and effort involved in building modern high-energy physics experiments, it is vital that particle fluences and energy depositions can be predicted reliably. This is done using Monte-Carlo simulation programs. Given in this paper are the results of comparisons in which the predictions of different simulation programs, all used in the evaluation of radiation backgrounds in the ATLAS and CMS experiments at the CERN Large Hadron Collider, are analysed. Such comparisons give confidence when the predictions agree, and possible cause for further investigation when they disagree. Dobbs, M. Frixione, S. Laenen, Eric De Roeck, A. Tollefson, K. Andersen, J.R. Balazs, C. Banfi, A. Berge, S. Bernreuther, W. Binoth, T. Brandenburg, A. Buttar, C. Cao, Q.H. Corcella, G. Cruz, A. Dawson, I. Del Duca, V. Drollinger, V. Dudko, L. Eynck, T. Field, R. Grazzini, M. Guillet, J.P. Heinrich, G. Huston, J. Kauer, N. Kidonakis, Nikolaos Kulesza, A. Lassila-Perini, K. Magnea, Lorenzo Mahmoudi, F. Maina, E. Maltoni, F. Nolten, M. Moraes, A. Moretti, S. Mrenna, S. Nadolsky, Pavel M. Nagy, Z. Olness, F. Puljak, I. Ross, D.A. Sabio Vera, Agustin Salam, G.P. Sherstnev, A. Si, Z.G. Sjostrand, T. Skands, Peter Z. Thome, E. Trocsanyi, Z. Uwer, P. Weinzierl, S. Yuan, C.P. Zanderighi, G. 291-409 2004 2004 This report documents the results obtained by the Working Group on Quantum Chromodynamics and the Standard Model for the Workshop `Physics at TeV Colliders'', Les Houches, France, 26 May - 6 June 2003. After a Monte Guide description, the first contributions report on progress in describing multiple interactions, important for the LHC, and underlying events. An announcement of a Monte Carlo database, under construction, is then followed by a number of contributions improving parton shower descriptions. Subsequently, a large number of contributions address resummations in various forms, after which follow studies of QCD effects in pion pair, top quark pair and photon pair plus jet production. After a study of electroweak corrections to hadronic precision observables, the report ends by presenting recent progress in methods to compute finite order corrections at one-loop with many legs, and at two-loop. Buttar, C M Cindro, V Dawson, I Mandic, I Moraes, A Activation Dose Module 2002 2002 One of the consequences of operating detector systems in the harsh radiation environments of the ATLAS inner-detector will be radioactivation of the components. If the levels of radioactivity and corresponding dose rates are significant, then there will be implications for any access or maintenance operations. Given in this note are predictions for the radioactivation of SCT barrel-modules in the expected radiation environment of the inner-detector, based on both calculations and measurements. It is shown that both neutron-capture and high-energy hadron reactions must be taken into account. The predictions show that, from a radiological point of view, the SCT barrel-modules should not pose any serious problems. Buttar, C M Dawson, I Moraes, A 10.5170/CERN-2001-005.412 2001 2001 Moraes, A M QCD, ATLAS 2008 2008 A brief overview of QCD studies at ATLAS is presented. The following QCD measurements are discussed: minimum bias, jets, parton luminosity and pdf, direct photon production, measurement of the strong coupling constant at large scales and multi-parton interactions. Moraes, A M Nucl. Phys. B, Proc. Suppl. 10.1016/j.nuclphysbps.2004.04.138 63-68 133 ATLAS Direct photon production Drell-Yan Heavy quark production Jet physics Parton distributions 2004 2004 Accurate measurements at ATLAS will allow perturbative QCD to be tested in an energy regime never probed. Operating at the expected level of precision, ATLAS will measure SM cross sections and QCD related processes at the LHC which will further constrain the parton densities distributions. We present results from simulations of jet studies, direct photon production, Drell-Yan processes and heavy flavour production which indicate the potential to investigate the partonic structure of protons at ATLAS. Moraes, A M direct photon production jet physics minimum-bias and the underlying event parton luminosities strong coupling constant 2003 2003 The LHC will allow QCD studies to be performed at very high energy, including precision tests and measurements in an as yet unexplored kinematic region. A detailed understanding of QCD is important for almost all physics processes to be studied at the LHC, as the production mechanisms are mostly controlled by QCD. This talk will review various measurements of QCD-related processes to be performed at the LHC, based on final states containing leptons, photons and jets. The kinematic reach and the expected statistical uncertainties will be described for selected examples. The achievable constraints on the parton distribution functions of the proton and a measurement of the strong coupling constant at very large scales will be presented. Where already studied, sources of systematic uncertainties and contributions from background processes are going to be discussed. Moraes, A M TGC W mass electroweak mixing angle single top quark production top quark mass 2003 2003 The ATLAS experiment at the LHC has vast potential for electroweak measurements and the 14 TeV center-of-mass energy will in addition allow new regimes of electroweak phenomena to be explored. The extreme brightness (luminosity) of the LHC beam crossings will allow significant improvements in the measurement of the mass of the top quark and the W boson. A significant improvement in the determination of the coupling in three vector boson vertices will be possible. Measurements of the forward- backward asymmetry in Z -> ee decays will provide competitive measurements of the Weinberg angle. Tests of dynamical symmetry breaking will be made from studies of vector boson scattering at high energies which are feasible thanks to the forward jet tagging capabilities of ATLAS. Electroweak single-top production will allow a new direct measurement of V_tb and of the top polarization. This talk will highlight recent electroweak studies performed by ATLAS. Moraes, A M SUSY, ATLAS, CMS 2006 2006 SUSY is a strong candidate for physics beyond the SM. If SUSY is realized at the TeV scale, ATLAS and CMS are likely to detect its signal. In this presentation a summary of the the discovery potential of SUSY at the LHC is presented. Examples of measurements to study the SUSY sector such as the SUSY mass scale, dilepton mass (kinematic endpoints), right-handed squark mass, and SUSY spin are also shown in this presentation. Clements, D Buttar, C Moraes, A VBF Central Jet Veto HIGGS 2005 2005 The efficiencies of vetoes used in the VBF Higgs channel (M(H)=160GeV) were evaluated for events generated using three different multiple interaction models (utilising PYTHIA version 6.221 and ATLFAST 8.0.5). The efficiency of two vetoes: the lepton-acceptance cut and the central jet veto (CJV) showed a dependence on the multiple interaction model used. The efficiency of the lepton-acceptance was found to vary between 58% and 61% whilst the central jet veto (pT>20GeV) varied between 68% and 83% as a function of the multiple interaction model. The effect of changing the Higgs mass (140 < M(H) < 190GeV) on the CJV efficiency was also studied and found to be negligible. Moraes, A Diffractive Physics QCD 2009 2009 This talk presents a brief review of a few diffractive physics studies to be done with ATLAS. It describes the main features of the forward detectors and gives examples of some measurements planned for diffractive topologies. Buckley, A Chekanov, S Hare, G Kar, D Moraes, A Nielsen, J Proudfoot, J Straessner, A Yoshida, R Wahrmund, S Wynne, B Underlying event Monte Carlo tuning Multiple parton interaction QCD 2010 2010 The first underlying event measurements with the ATLAS detector at the LHC are presented. Data were collected using a minimum-bias trigger in December 2009 and March 2010 during proton-proton collisions at center of mass energies of 900 GeV and 7 TeV respectively. The observables sensitive to the underlying event, i.e the charged particle density and the charged transverse momentum sum are measured as function of the leading track transverse momentum. The angular distribution of the charged tracks with respect to the leading track is also presented, as well as the correlation between mean transverse momentum and charged particle multiplicity. The data show a higher underlying event activity than predicted by the different Monte Carlo models to which it is compared. Buckley, A Chekanov, S Hare, G Kar, D Moraes, A Nielsen, J Proudfoot, J Straessner, A Yoshida, R Wahrmund, S Wynne, B Underlying event Monte Carlo tuning Multiple parton interaction QCD 2010 2010 The underlying event measurements with the ATLAS detector at the LHC at the center of mass energy of 7 TeV are presented. Data were collected using a minimum-bias trigger on 30th March 2010. The observables sensitive to the underlying event, i.e the charged particle density and the charged transverse momentum sum are measured as function of the leading track transverse momentum. The angular distribution of the charged tracks with respect to the leading track is also presented, as well as the correlation between mean transverse momentum and charged particle multiplicity. The data show a higher underlying event activity than predicted by the different Monte Carlo models to which it is compared. Buckley, A Chekanov, S Hare, G Kar, D Moraes, A Nielsen, J Proudfoot, J Straessner, A Yoshida, R Wahrmund, S Wynne, B Underlying event Monte Carlo tuning QCD 2010 2010 The first underlying event measurements with the ATLAS detector at the LHC are presented. Data were collected using a minimum-bias trigger in December 2009 during proton-proton collisions at a center of mass energy of 900 GeV. The observables sensitive to the underlying event, i.e the charged particle density and the charged transverse momentum sum are measured as functions of the leading track. The angular distribution of the charged tracks with respect to the leading track is also looked at, as well as the correlation between mean transverse momentum and charged particle multiplicity. The measurements are compared to different Monte Carlo model predictions and a higher particle density was observed in data for the underlying event. Buckley, A Chekanov, S Hare, G Kar, D Moraes, A Nielsen, J Proudfoot, J Yoshida, R Wahrmund, S Underlying event Monte Carlo tuning QCD QCD 2010 2010 Measurements of charged particle densities using minimum-bias events from proton-proton collisions at a center of mass energy of 900 GeV are presented. The densities and the average transverse momenta of charged particles are shown as a function of the transverse momenta of a leading in pT charged particle, concentrating on phase-space regions which are most sensitive to the underlying event. The data are unfolded using a bin-by-bin correction procedure and compared to several Monte Carlo (MC) predictions with different treatments of the underlying event. Buckley, A Chekanov, S Hare, G Kar, D Moraes, A Nielsen, J Proudfoot, J Straessner, A Yoshida, R Wahrmund, S Wynne, B Underlying event Monte Carlo tuning QCD 2010 2010 The first underlying event measurements with the ATLAS detector at the LHC are presented. Data were collected using a minimum-bias trigger in December 2009 during proton-proton collisions at a center of mass energy of 900 GeV. The observables sensitive to the underlying event, i.e the charged particle density and the charged transverse momentum sum are measured as functions of the leading track. The angular distribution of the charged tracks with respect to the leading track is also looked at, as well as the correlation between mean transverse momentum and charged particle multiplicity. The measurements are compared to different Monte Carlo model predictions and a higher particle density was observed in data for the underlying event. Campanelli, M Kama, S Katzy, J Kepka, O Mijovic, L Monk, J W Moraes, A Newman, P Steinberg, P A Warsinsky, M MCGENERATORS 2010 2010 This note describes the MC studies specifically done for the analysis of minimum bias events taken at 900 GeV. Predictions of minimum bias distributions at 900 GeV from different PYTHIA tunes are presented. The tunes were done to data from several experiments and over a wide range of energies below and above 900 GeV. Predictions from PHOJET, which uses a different physics model to PYTHIA, are also presented. The results of hadron level analysis that was carried out out on the different Monte Carlo tunes to simulate the analysis of the data are discussed. In addition, observables sensitive to the different MC models are presented. Buckley, A Katzy, J Kersevan, B Mijovic, L Moraes, A Schulz, H Warsinsky, M MC tuning Pythia Herwig Jimmy PDF MCGENERATORS 2010 2010 This note describes the ATLAS tunes of underlying event and minimum bias description for the main Monte Carlo generators used in the MC09 production. For the main shower generators, pythia and herwig (with jimmy), the MRST LO* parton distribution functions (PDFs) were used for the first time in ATLAS. Special studies on the performance of these, conceptually new, PDFs for high pt physics processes at LHC energies are presented. In addition, a tune of jimmy for CTEQ6.6 is presented, for use with MC@NLO. Buckley, A Katzy, J Kersevan, B Mijovic, L Moraes, A Schulz, H Warsinsky, M MC Generators Tuning Pythia Herwig MC09 MCGENERATORS 2009 2009 This note describes the ATLAS tune for the underlying event description and minimum bias events for the main Monte Carlo generators used in the MC09 production. For the main shower generators, PYT HI A and HERWIG, the MRST LO* parton density functions (pdfs) were used for the first time in ATLAS. Special studies on the performance of the conceptually new pdfs for high pT physics processes at LHC energies are presented. Buckley, A Katzy, J M Kersesan, B P Mijovic, L Moraes, A Schulz, H Warsinsky, W MC tuning Pythia Herwig/Jimmy modified LO pdf MCGENERATORS 2009 2009 This note describes the ATLAS tune for the underlying event description and min.bias events for the main Monte Carlo generators us ed in the MC09 production. For the main shower generators, Pythia~cite{pythia6} and Herwigcite{herwig},the MRST LO* parton densi ty functions (pdfs) were used for the first time in ATLAS. Special studies on the performance of the conceptually new pdfs for hig h pt physics processes at LHC energies are presented. Moraes, A Diffractive Physics QCD 2009 2009 This talk presents a brief review of a few diffractive physics studies to be done with ATLAS. It describes the main features of the forward detectors and gives examples of some measurements planned for diffractive topologies. Abat, E. Abbott, B. Abdallah, J. Abdelalim, A.A. Abdesselam, A. Abdinov, O. Abi, B. Abolins, M. Abramowicz, H. Abreu, H. Acerbi, E. Acharya, B.S. Ackers, M. Adams, D.L. Addy, T.N. Adelman, J. Aderholz, M. Adorisio, C. Adragna, P. Adye, T. Aefsky, S. Aguilar-Saavedra, J.A. Aharrouche, M. Ahlen, S.P. Ahles, F. Ahmad, A. Ahmed, H. Ahsan, M. Aielli, G. Akdogan, T. Akesson, P.F. Akesson, T.P.A. Akimoto, G. Akimov, A.V. Aktas, A. Alam, M.S. Alam, M.A. Albert, J. Albrand, S. Aleksa, M. Aleksandrov, I.N. Aleppo, M. Alessandria, F. Alexa, C. Alexander, G. Alexandre, G. Alexopoulos, T. Alhroob, M. Aliev, M. Alimonti, G. Alison, J. Aliyev, M. Allport, P.P. Allwood-Spiers, S.E. Almond, J. Aloisio, A. Alon, R. Alonso, A. Alonso, J. Alviggi, M.G. Amako, K. Amaral, P. Ambrosini, G. Ambrosio, G. Amelung, C. Ammosov, V.V. Amorim, A. Amoros, G. Amram, N. Anastopoulos, C. Andeen, T. Anders, C.F. Anderson, K.J. Andreazza, A. Andrei, V. Andrieux, M.L. Anduaga, X.S. Angerami, A. Anghinolfi, F. Anjos, N. Annovi, A. Antonaki, A. Antonelli, M. Antonelli, S. Antos, J. Antunovic, B. Anulli, F. Aoun, S. Arabidze, G. Aracena, I. Arai, Y. Arce, A.T.H. Archambault, J.P. Arfaoui, S. Arguin, J.F. Argyropoulos, T. Arik, E. Arik, M. Armbruster, A.J. Arms, K.E. Armstrong, S.R. Arnaez, O. Arnault, C. Artamonov, A. Arutinov, D. Asai, M. Asai, S. Asfandiyarov, R. Ask, S. Asman, B. Asner, D. Asquith, L. Assamagan, K. Astbury, A. Astvatsatourov, A. Athar, B. Atoian, G. Aubert, B. Auerbach, B. Auge, E. Augsten, K. Aurousseau, M. Austin, N. Avolio, G. Avramidou, R. Axen, D. Ay, C. Azuelos, G. Azuma, Y. Baak, M.A. Baccaglioni, G. Bacci, C. Bach, A.M. Bachacou, H. Bachas, K. Bachy, G. Backes, M. Badescu, E. Bagnaia, P. Bai, Y. Bailey, D.C. Bain, T. Baines, J.T. Baker, O.K. Baker, M.D. Baker, S. Baltasar Dos Santos Pedrosa, F. Banas, E. Banerjee, P. Banerjee, S. Banfi, D. Bangert, A. Bansal, V. Baranov, S.P. Baranov, S. Barashkou, A. Barber, T. Barberio, E.L. Barberis, D. Barbero, M. Bardin, D.Y. Barillari, T. Barisonzi, M. Barklow, T. Barlow, N. Barnett, B.M. Barnett, R.M. Baroncelli, A. Barone, M. Barr, A.J. Barreiro, F. Barreiro Guimaraes da Costa, J. Barrillon, P. Bartheld, V. Bartko, H. Bartoldus, R. Bartsch, D. Bates, R.L. Bathe, S. Batkova, L. Batley, J.R. Battaglia, A. Battistin, M. Battistoni, G. Bauer, F. Bawa, H.S. Bazalova, M. Beare, B. Beau, T. Beauchemin, P.H. Beccherle, R. Becerici, N. Bechtle, P. Beck, G.A. Beck, H.P. Beckingham, M. Becks, K.H. Beddall, A.J. Beddall, A. Bednyakov, V.A. Bee, C. Begel, M. Behar Harpaz, S. Behera, P.K. Beimforde, M. Belanger, G.A.N. Belanger-Champagne, C. Belhorma, B. Bell, P.J. Bell, W.H. Bella, G. Bellagamba, L. Bellina, F. Bellomo, G. Bellomo, M. Belloni, A. Belotskiy, K. Beltramello, O. Belymam, A. Ben Ami, S. Benary, O. Benchekroun, D. Benchouk, C. Bendel, M. Benedict, B.H. Benekos, N. Benhammou, Y. Benincasa, G.P. Benjamin, D.P. Benoit, M. Bensinger, J.R. Benslama, K. Bentvelsen, S. Beretta, M. Berge, D. Bergeaas Kuutmann, E. Berger, N. Berghaus, F. Berglund, E. Beringer, J. Bernardet, K. Bernat, P. Bernhard, R. Bernius, C. Berry, T. Bertin, A. Bertinelli, F. Bertolucci, S. Besana, M.I. Besson, N. Bethke, S. Bianchi, R.M. Bianco, M. Biebel, O. Bieri, M. Biesiada, J. Biglietti, M. Bilokon, H. Binder, M. Bindi, M. Binet, S. Bingul, A. Bini, C. Biscarat, C. Bischof, R. Bitenc, U. Black, K.M. Blair, R.E. Blanch, O. Blanchard, J.B. Blanchot, G. Blocker, C. Blocki, J. Blondel, A. Blum, W. Blumenschein, U. Boaretto, C. Bobbink, G.J. Bocci, A. Bocian, D. Bock, R. Boehler, M. Boehm, M. Boek, J. Boelaert, N. Boser, S. Bogaerts, J.A. Bogouch, A. Bohm, C. Bohm, J. Boisvert, V. Bold, T. Boldea, V. Boldyrev, A. Bondarenko, V.G. Bondioli, M. Bonino, R. Boonekamp, M. Boorman, G. Boosten, M. Booth, C.N. Booth, P.S.L. Booth, P. Booth, J.R.A. Bordoni, S. Borer, C. Borer, K. Borisov, A. 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Zimmermann, S. Zimmermann, S. Ziolkowski, M. Zitoun, R. Zivkovic, L. Zmouchko, V.V. Zobernig, G. Zoccoli, A. Zolnierowski, Y. Zsenei, A. zur Nedden, M. Zutshi, V. Aad, G. Phys. Lett. B 10.1016/j.physletb.2010.03.064 21-42 688 1 2010 2010 The first measurements from proton-proton collisions recorded with the ATLAS detector at the LHC are presented. Data were collected in December 2009 using a minimum-bias trigger during collisions at a centre-of-mass energy of 900 GeV. The charged-particle multiplicity, its dependence on transverse momentum and pseudorapidity, and the relationship between mean transverse momentum and charged-particle multiplicity are measured for events with at least one charged particle in the kinematic range |eta|<2.5 and pT>500 MeV. The measurements are compared to Monte Carlo models of proton-proton collisions and to results from other experiments at the same centre-of-mass energy. 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At this time, only part of the calorimeter was readout, but since the beginning of 2008, all calorimeter cells have been connected to the ATLAS readout system in preparation for LHC collisions. This paper gives an overview of the liquid argon calorimeter performance measured in situ with random triggers, calibration data, cosmic muons, and LHC beam splash events. Results on the detector operation, timing performance, electronics noise, and gain stability are presented. High energy deposits from radiative cosmic muons and beam splash events allow to check the intrinsic constant term of the energy resolution. The uniformity of the electromagnetic barrel calorimeter response along eta (averaged over phi) is measured at the percent level using minimum ionizing cosmic muons. Finally, studies of electromagnetic showers from radiative muons have been used to cross-check the Monte Carlo simulation. The performance results obtained using the ATLAS readout, data acquisition, and reconstruction software indicate that the liquid argon calorimeter is well-prepared for collisions at the dawn of the LHC era.