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Observation Exercise 2010
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last update: 18 Oct 2010, 14:00

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1.	Observation of top quark pair production in ATLAS at sqrt{s}=7 TeV / Collaboration, ATLAS The observation of ttbar production in pp collisions at a centre-of-mass energy sqrt(s) = 7 TeV is presented. In a data sample of 2.9 pb−1 recorded by the ATLAS detector at the Large Hadron Collider, 37 candidate events are observed in the single lepton topology with electrons or muons, and 9 in the dilepton topology. [...] ATL-COM-PHYS-2010-854.- Geneva : CERN, 2010 - 27 p. Fulltext: PDF;
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2.	Observation of top quark pair production in the semileptonic decay channel at sqrt(s) = 7 TeV with the ATLAS detector / Working group, Top The first cross section measurements of ttbar production in pp collisions at a centre-of-mass energy sqrt(s) = 7 TeV are presented. In a data sample of 2.9 pb−1 recorded by the ATLAS detector at the Large Hadron Collider, 37 candidate events are observed in the semileptonic topology with electrons or muons. [...] ATL-COM-PHYS-2010-855.- Geneva : CERN, 2010 - 36 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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3.	Analysis of ttbar production in the dilepton decay channel at 7 TeV with 2.9 pb−1 / Working group, Top We present a first measurement of ttbar production with the ATLAS detector at the LHC in pp collisions at sqrt(s) = 7 TeV in final states with two oppositely-charged leptons (ee, mm and em), significant missing transverse energy (ETmiss) and two or more jets. In a dataset with integrated luminosity of 2.9 pb−1 we observe nine events in the dilepton channel. [...] ATL-COM-PHYS-2010-856.- Geneva : CERN, 2010 - 30 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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4.	Lepton Trigger and Identification for the first {\it Top quark} observation / Benekos, N (University of Illinois Urbana-Champaign); Benslama, K (University of Regina); Bosman, M (IFAE); Cerrito, L (Queen Mary University of London); Derue, F (LPNHE); Ferrara, V (Humboldt-Universitaet zu Berlin); Ferrari, P (Nikhef); Fiorini, L (IFAE); Heelan, L (University of Carleton); Heim, S (Michigan State University) et al. In this note we present the selections applied to identify leptons (electrons and muons) for the first Top WG \ttbar~cross section measurements in the single and di-lepton channels. We measure the associated efficiencies at the trigger and offline level using the {\it Tag and probe} method, on the same dataset using for the cross section measurement, corresponding to an integrated luminosity of $\mathscr{L} = 2.89~\ipb$. [...] ATL-COM-PHYS-2010-826.- Geneva : CERN, 2010 - 48 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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5.	Jet selection for top physics / Arguin, J F (Lawrence Berkeley National Lab.); Boumediene, D (LPC, Clermont Ferrand); Bondioli, M (University of California, Irvine); Cortiana, G (Max-Planck-Institut fuer Physik, Muenchen); Costa Mezquita, M (Instituto de Fisica Corpuscular (IFIC), Centro Mixto UVEG-CSIC); Cowden, C (University of Cambridge); DeViveiros, P-O (University of Toronto); Doglioni, C (University of Oxford); Erdmann, J (University of Goettingen); Ferrando, J (University of Oxford) et al. This note summarizes the current status of the definition of jets for the top-rediscovery effort. Studies on the data quality, jet cleaning and calibration are shown before more analysis-related topics are discussed. [...] ATL-COM-PHYS-2010-835.- Geneva : CERN, 2010 - 61 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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6.	Missing Transverse Energy for Top Physics analyses with early ATLAS data at $sqrt{s}$=7~TeV / Canepa, A (TRIUMF); Cinca, D (University Blaise Pascal Clermont-Ferrand II); Farrell, S (University of California Irvine); Garitaonandia Elejabarrieta, H (Nikef); Grundler, U (Iowa State University); Johns, K (University of Arizona); Kaushik, V (University of Arizona); Khandanya, H (University of Illinois Urbana Champaign); Lei, X (University of Arizona); Lessard, JR (University of Victoria) et al. This note describes the object based missing transverse energy reconstruction and performance used in Top Physics analyses performed with 2.89ipb{} of data recorded by the ATLAS detector at ts{}=7~TeV.. ATL-COM-PHYS-2010-821.- Geneva : CERN, 2010 - 42 p. Fulltext: PDF; External link: Approved Note [Approved as a Note - Check status]
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7.	B-tagging for top physics analyses with early ATLAS data at sqrt(s) = 7 TeV / Alvarez, B; Bachacou, H; Boudreau, J; Bousson, N; Cerrito, L; Clement, B; Cooper, B; Delemontex, T; Donini, J; Feligioni, L et al. Algorithms distinguishing jets originating from $b$ quarks from other jet flavors are important tools in top physics to improve purity and combinatorical background. This document describes the algorithms to identify $b$-quark jets in ATLAS and the calibration techniques based on LHC collider data. [...] ATL-COM-PHYS-2010-846.- Geneva : CERN, 2010 - 38 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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8.	Mis-identified lepton backgrounds to top quark pair production : Supporting note 5 / Abi, B; Adelman, J; Almond, J; Arguin, J F; Besana, I; Bordoni, S; Bosman, M; Brau, J; Cortes-Gonzalez, A; Doxiadis, A et al. The note presents an analysis of the mis-identified lepton (``fake'') backgrounds to top quark pair production in the single-lepton and dilepton channels. Several data driven methods are used in each channel to estimate these backgrounds and assess the corresponding systematic uncertainties. [...] ATL-COM-PHYS-2010-849.- Geneva : CERN, 2010 - 62 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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9.	Estimation of the W+Jets Background for Top Quark Re-Discovery in the Single Lepton+Jets Channel / Acharya, B; Arguin, J-F; Barisonzi, M; Besana, IM; Bosman, M; Brock, IC; Calkins, R; Charkaborty, D; Cobal, M; Cristinziani, M et al. W boson production in association with jets is predicted to be the dominant background to $t ar{t}$ events in the single lepton + jets channel. This note discusses the W+jets background to top pair production for two different luminosity scenarios. [...] ATL-COM-PHYS-2010-834.- Geneva : CERN, 2010 - 30 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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10.	Study of Z/g+jets background for ttbar to 2 leptons analysis / Cranmer, K; Cristinziani, M; Khandanyan, H; Lewis, G; Liss, T; Papadelis, A; Poghosyan, T; Sherman, D; Sjoelin, J; Werth, M et al. This note is a support note dedicated to Z/g+jets production as a background to the ttbar cross-section measurement in the dilepton channel. The output from the note is a baseline set of cuts for Z/g+jets rejection and an estimated yield, with uncertainty, of Z/g+jets events in the ttbar signal region. [...] ATL-COM-PHYS-2010-845.- Geneva : CERN, 2010 - 19 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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11.	Technical aspects of the first top pair analyses : Note 8 / Adelman, J; Barisonzi, M; Bell, W H; Brooijmans, G; Cortiana, G; Farrel, S; Federic, P; Ferrari, A; Finelli, K; Gaponenko, A et al. This note is dedicated to the technical aspects of the first ATLAS top pair analyses. It describes derived physics data samples, the software used to produce and analyze the samples, steps taken to ensure the correctness of the software and reproducibility of the results. [...] ATL-COM-PHYS-2010-820.- Geneva : CERN, 2010 - 21 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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12.	Monte Carlo samples used for top physics : Top Working Group Note IX / Allwood-Spires, S; Barisonzi, M; Beauchemin, H; Bruneliere, R; Buchanan, J; Castro, N F; Devetak, E; Feng, C; Ferrando, J; Hawkings, R et al. This note documents the standard Monte Carlo samples to be used for top rediscovery analyses with 7 TeV data. The dataset numbers, cross sections and statistics are detailed. [...] ATL-COM-PHYS-2010-836.- Geneva : CERN, 2010 - 38 p. Access to fulltext document: PDF; External link: Approved Note [Approved as a Note - Check status]
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