engChallis, RachelBose-Einstein Correlations at NOMADParticle Physics - ExperimentCERN-THESIS-2002-0762002http://cds.cern.ch/record/2284980http://cds.cern.ch/record/2284980oai:inspirehep.net:610613 engMameghani, RaphaelAnalysis of Cosmic Muons Measured in CMS Drift ChambersDetectors and Experimental TechniquesCERN-THESIS-2004-098Why do you study physics?" Which student of that subject does not know this question asked by a friend or acquaintance not being involved in scientific research? A typical answer starts with the native curiosity of men and ends with the Theory of Everything, which unfortunatly still has to be developed even though there already are auspicious approaches. Usually the next question from that person is "And what is that all good for?" Typical replies from the scientist to-be are shrugged shoulders and a lack of understanding for such a question. But let us start from scratch: Ever since the dawn of civilisation people recognised certain rules and patterns within their environment, such as night and day or the change of the seasons, and started to think of mystic explanations for these observations. Later in the ancient world first theories arose about the composition of matter: Demokrit's idea of atoms and Aristoteles' thesis of four elements. Both suggestions had in common that they tried to reduce a broad spectrum of matter properties to a compact set of constituents. But rightly, these persons are regarded as philosophers and not as physicists simply because they did not make predictions that could be compared to reality. Physics from a modern point of view started when theories began to quantify expectations and were tested through experiments for their validity. With the publication of Newton's theory of motion and gravitation, his Principia Mathematica, physics entered a new age in which nature decided about success or failure of an explanation. As history shows, many long time accepted theories later were proven to be inaccurate, as experiments became able to test their predictions on new scales, which resulted in modifications of the models used or sometimes even in completely new ideas. The presumably greatest leaps that followed that way were Maxwell's theory about electromagnetic phenomena, Einstein's theories of relativity and quantum theory, developed by a number of now legendary scientists. The common aim of all these ideas is the reduction of the complex impression of the world to as few basic elements as possible, perhaps one day to a single fundamental principle. But as that aim could not be reached until now it is appropriate to divide the wide world of physics into some major fields, each with a different emphasis, of which one is particle physics. Ratios of chemical reactions gave the first hints that matter consists of tiny lumps. Later on it was discovered by Thomson that these atoms are not elementary and scattering experiments with electrons by Lenard and with alpha particles by Geiger, Marsden and Rutherford turned out that atoms are composed of electrons carrying a unit of negative charge which surround a positively charged nucleus. A new era with particle accelerators, allowing studies such as the structure of atomic nuclei, revealed that protons and neutrons build up the atomic core. Furthermore, physicists detected a large quantity of new, exotic particles being produced at high energies, first by cosmic rays and later also in accelerator experiments. But it became clear that this initial confusion is explainable by the existence of a few kinds of quarks being combined following certain rules. The quarks are regarded as elementary until today. The present state of particle physics is desribed by the so called Standard Model containing not only these particles but also the forces that let them interact. This theory already made a lot of predictions which could be confirmed by experiments. But one of the main hypotheses is still left to be examined: the existence of the predicted Higgs particle could only be excluded for masses smaller than 114 GeV/c2. To answer the question if it does exist after all, and to look for the presence of phenomena beyond the Standard Model, new, unevitably huge setups are required. Right now a new particle accelerator called Large Hadron Collider, abbreviated as LHC, and its two major detectors Compact Muon Solenoid (CMS) and A Toroidal LHC Apparatus (ATLAS) are under construction at the research centre CERN near Geneva. One part of the first mentioned CMS detector is a complex system for the detection of particles called muons. This installation has been designed to be able to measure muons being produced at the collision of accelerated particles and to recognise the signature from the decay of possibly produced Higgs particles into four muons. The contribution of the III. Phys. Inst. of RWTH Aachen University mainly consists of the development, production and subsequent testing of drift chambers as a part of the muon system. This diploma thesis concerns the analysis of data taken from drift chambers in a test setup with cosmic muons with a first emphasis on the quality control of the production and a second on the properties of just these cosmic particles as far as measurable. A major part of this work was the development of a software that transforms the recorded data into particle track descriptions from which the quality of a muon chamber can be deduced. As a side effect in succession it was tried to confirm already known characteristics of cosmic muons. Now my trial to answer the question from above, what all this is good for, apart from satisfying the curiosity to see how the world can be described: I don't know. Maybe the technology and the knowledge gained by the challenge of finding the Higgs particle will turn out to be useful in some way we do not think of now, as it has already happened with earlier experiments. But I am not a prophet...2004http://cds.cern.ch/record/2284026http://cds.cern.ch/record/2284026oai:inspirehep.net:1616590 engBock, NicolasFemtoscopy of proton-proton collisions in the ALICE experimentNuclear Physics - ExperimentAAT-3493318CERN-THESIS-2011-397The Large Ion Collider Experiment (ALICE) at CERN has been designed to study matter at extreme conditions of temperature and pressure, with the long term goal of observing deconfined matter (free quarks and gluons), study its properties and learn more details about the phase diagram of nuclear matter. The ALICE experiment provides excellent particle tracking capabilities in high multiplicity proton-proton and heavy ion collisions, allowing to carry out detailed research of nuclear matter. This dissertation presents the study of the space time structure of the particle emission region, also known as femtoscopy, in proton-proton collisions at 0.9, 2.76 and 7.0 TeV. The emission region can be characterized by taking advantage of the Bose-Einstein effect for identical particles, which causes an enhancement of produced identical pairs at low relative momentum. The geometry of the emission region is related to the relative momentum distribution of all pairs by the Fourier transform of the source function, therefore the measurement of the final relative momentum distribution allows to extract the initial space-time characteristics. Results show that there is a clear dependence of the femtoscopic radii on event multiplicity as well as transverse momentum, a signature of the transition of nuclear matter into its fundamental components and also of strong interaction among these. The present work also considers a physics motivated parametrization of non-femtoscopic correlations to characterize the background signal. It is shown that at these high energies and multiplicities this parametrization does not work as it does for lower energies. A special chapter containing the detailed study of possible signatures of black hole formation is also presented.2011http://cds.cern.ch/record/2283140http://cds.cern.ch/record/2283140oai:inspirehep.net:1591384 ATLAS CollaborationResearchers Night 2017 at ATLASATLASATLAS-PHOTO-2017-028600 visitors welcome in the ATLAS visitor center for the Researchers Night - 29.09.20172017http://cds.cern.ch/record/2286432http://cds.cern.ch/record/2286432oai:cds.cern.ch:2286432General Photo Bennett, Sophia ElizabethEUCAS 2017 at CICGPhotolabCERN-PHOTO-201709-237EUCAS 2017 at CICG2017http://cds.cern.ch/record/2286216Miscellaneoushttp://cds.cern.ch/record/2286216oai:cds.cern.ch:2286216General Photo Bennett, Sophia ElizabethAccelerate Croatia Artist Tomo Savić-Gecan at the CERN Archives with Anita HollierPhotolabCERN-PHOTO-201709-236Accelerate Croatia Artist Tomo Savić-Gecan at the CERN Archives with Anita Hollier2017http://cds.cern.ch/record/2286215Life at CERNhttp://cds.cern.ch/record/2286215oai:cds.cern.ch:2286215General Photo Bennett, Sophia ElizabethAccelerate Croatia Artist Tomo Savić Gecan at CLICPhotolabCERN-PHOTO-201709-235Accelerate Croatia Artist Tomo Savić Gecan at CLIC2017http://cds.cern.ch/record/2286208Life at CERNhttp://cds.cern.ch/record/2286208oai:cds.cern.ch:2286208General Photo Bennett, Sophia ElizabethCouncil Chamber - Delegates of the CouncilPhotolabCERN-PHOTO-201709-234Salle du Conseil - des Delegués au Conseil2017http://cds.cern.ch/record/2286205Life at CERNhttp://cds.cern.ch/record/2286205oai:cds.cern.ch:2286205General Photo Bennett, Sophia ElizabethCharpak Room - Members of the Finance CommitteePhotolabCERN-PHOTO-201709-233Salle Charpak - des membres du Comité des Finances2017http://cds.cern.ch/record/2286150Life at CERNhttp://cds.cern.ch/record/2286150oai:cds.cern.ch:2286150General Photo Bennett, Sophia ElizabethBL4S Supporters event 2017PhotolabCERN-PHOTO-201709-232BL4S Supporters event 20172017http://cds.cern.ch/record/2286046Life at CERNhttp://cds.cern.ch/record/2286046oai:cds.cern.ch:2286046General Photo Ordan, Julien MariusREGA Circulation Accident on Prevessin's sitePhotolabCERN-PHOTO-201709-231Firemen and rescue exercice for circulation on Prevessin's site2017http://cds.cern.ch/record/2286001Life at CERNhttp://cds.cern.ch/record/2286001oai:cds.cern.ch:2286001General Photo Rubiato Bergerie-Pagadoy, Nikolas AitorMr Teruo Kishi Science and Technology Advisor to the Minister for Foreign Affairs Japan Thursday, 14 September 2017PhotolabCERN-PHOTO-201709-230Mr Teruo Kishi Science and Technology Advisor to the Minister for Foreign Affairs Japan Thursday, 14 September 20172017http://cds.cern.ch/record/2285923Personalities and History of CERNhttp://cds.cern.ch/record/2285923oai:cds.cern.ch:2285923General Photo Bennett, Sophia ElizabethMembers of the SPC - Salle CharpakPhotolabCERN-PHOTO-201709-229Members of the SPC - Salle Charpak2017http://cds.cern.ch/record/2285908Life at CERNhttp://cds.cern.ch/record/2285908oai:cds.cern.ch:2285908General Photo Bennett, Sophia ElizabethHis Excellency Mr Māris Kučinskis Prime Minister Republic of Latvia Wednesday, 20 September 2017PhotolabCERN-PHOTO-201709-228His Excellency Mr Māris Kučinskis Prime Minister Republic of Latvia Wednesday, 20 September 20172017http://cds.cern.ch/record/2285670Life at CERNhttp://cds.cern.ch/record/2285670oai:cds.cern.ch:2285670General Photo Bennett, Sophia ElizabethInterCommunity 2017 Internet Society 25th BirthdayPhotolabCERN-PHOTO-201709-227InterCommunity 2017 Internet Society 25th Birthday2017http://cds.cern.ch/record/2285658Life at CERNhttp://cds.cern.ch/record/2285658oai:cds.cern.ch:2285658General Photo Bennett, Sophia ElizabethCERN openlab open dayPhotolabCERN-PHOTO-201709-226Presentation of CERN Openlab's fifth three-year phase technical highlights..2017http://cds.cern.ch/record/2285458Exhibitionhttp://cds.cern.ch/record/2285458oai:cds.cern.ch:2285458General Photo Bennett, Sophia ElizabethEUCAS 2017 Social Event and Exhibition at SM18PhotolabCERN-PHOTO-201709-225EUCAS 2017 Social Event and Exhibition at SM182017http://cds.cern.ch/record/2285456Exhibitionhttp://cds.cern.ch/record/2285456oai:cds.cern.ch:2285456General Photo ATLAS CollaborationATLAS B0 toroid prototype, from construction to P1ATLASATLAS-PHOTO-2017-026The ATLAS B0 toroid prototype was tested and stored for years in building 180. On its way to be displayed in P1 it made a stop in SM18, to be featured in the context of the EUCAS 2017 conference.2017http://cds.cern.ch/record/2285252http://cds.cern.ch/record/2285252oai:cds.cern.ch:2285252General Photo Brice, MaximilienOrdan, Julien MariusALICE Detector - various panoramasPhotolabCERN-PHOTO-201709-224ALICE Detector - various panoramas: stitching of 45 pictures with 50 mm and various 360 8K resolution. original size around 45000 px x 31000 px2017http://cds.cern.ch/record/2285060Acceleratorshttp://cds.cern.ch/record/2285060oai:cds.cern.ch:2285060General Photo Brice, MaximilienSPS tunnel during Technical StopPhotolabCERN-PHOTO-201709-223SPS tunnel during short Technical Stop September 20172017http://cds.cern.ch/record/2285059Acceleratorshttp://cds.cern.ch/record/2285059oai:cds.cern.ch:2285059General Photo Bennett, Sophia ElizabethIEEE CSC 2017 Awards at Intercontinental HotelPhotolabCERN-PHOTO-201709-222IEEE CSC 2017 Awards at Intercontinental Hotel2017http://cds.cern.ch/record/2285048Personalities and History of CERNhttp://cds.cern.ch/record/2285048oai:cds.cern.ch:2285048General Photo Julien Marius, OrdanFabiola Gianotti's Conference "Le Boson de Higgs dans notre vie", Uni Dufour, Geneva, 19 Sept 2017PhotolabCERN-PHOTO-201709-221Fabiola Gianotti's Conference at UNIGE 19/09/20172017http://cds.cern.ch/record/2285021Personalities and History of CERNhttp://cds.cern.ch/record/2285021oai:cds.cern.ch:2285021General Photo Bennett, Sophia ElizabethPietari Kauttu PortraitPhotolabCERN-PHOTO-201709-220Pietari Kauttu Portrait2017http://cds.cern.ch/record/2284948Personalities and History of CERNhttp://cds.cern.ch/record/2284948oai:cds.cern.ch:2284948General Photo Bennett, Sophia ElizabethHis Excellency Mr Deepak Dhital Ambassador Extraordinary and Plenipotentiary Permanent Representative of the Federal Democratic Republic of Nepal to the United Nations Office and other international organisations in GenevaPhotolabCERN-PHOTO-201709-219His Excellency Mr Deepak Dhital Ambassador Extraordinary and Plenipotentiary Permanent Representative of the Federal Democratic Republic of Nepal to the United Nations Office and other international organisations in Geneva2017http://cds.cern.ch/record/2284945Life at CERNhttp://cds.cern.ch/record/2284945oai:cds.cern.ch:2284945General Photo Ordan, Julien MariusIEEE Awards CICG 18 Sept 2017PhotolabCERN-PHOTO-201709-218IEEE Awards CICG 18 Sept 20172017http://cds.cern.ch/record/2284745Personalities and History of CERNhttp://cds.cern.ch/record/2284745oai:cds.cern.ch:2284745General Photo Ordan, Julien MariusGlassBox Sept 2017PhotolabCERN-PHOTO-201709-217GlassBox Sept 20172017http://cds.cern.ch/record/2284340Exhibitionhttp://cds.cern.ch/record/2284340oai:cds.cern.ch:2284340General Photo Ordan, Julien MariusProfessor Petr S. Chubik Rector Tomsk Polytechnic University Russian Federation, 12 September 2017PhotolabCERN-PHOTO-201709-216Visit of Professor Petr S. Chubik Rector Tomsk Polytechnic University2017http://cds.cern.ch/record/2283217Personalities and History of CERNhttp://cds.cern.ch/record/2283217oai:cds.cern.ch:2283217General Photo Brice, MaximilienComputer equipment donation to SESAME (Jordan) in presence of Charlotte Warakaulle, Frédéric Hemmer and Rolf Heuer (representative SESAME)PhotolabCERN-PHOTO-201709-215Computer equipment donation to SESAME (Jordan) in presence of Charlotte Warakaulle, Frédéric Hemmer and Rolf Heuer (representative SESAME)2017http://cds.cern.ch/record/2283180Personalities and History of CERNhttp://cds.cern.ch/record/2283180oai:cds.cern.ch:2283180General Photo Ordan, Julien MariusLife in CCC September 2017PhotolabCERN-PHOTO-201709-214Some instants of the CCC activity2017http://cds.cern.ch/record/2283167Life at CERNhttp://cds.cern.ch/record/2283167oai:cds.cern.ch:2283167General Photo Struik, MichaelCERN quadrupole in front of UN HQPhotolabCERN-PHOTO-201709-213CERN quadrupole in front of UN HQ2017http://cds.cern.ch/record/2282697Acceleratorshttp://cds.cern.ch/record/2282697oai:cds.cern.ch:2282697General Photo Bennett, Sophia ElizabethISOLDE historic photosPhotolabCERN-PHOTO-201709-212ISOLDE historic photos2017http://cds.cern.ch/record/2282571Experiments and Trackshttp://cds.cern.ch/record/2282571oai:cds.cern.ch:2282571General Photo Biondi, SilviaATLAS Virtual Visit from Holy Comforter Episcopal School, Tallahassee, Florida, USAATLASATLAS-PHOTO-2017-023Photos from an ATLAS Virtual Visit by the Holy Comforter Episcopal School, Tallahassee, Florida, USA2017http://cds.cern.ch/record/2282545http://cds.cern.ch/record/2282545oai:cds.cern.ch:2282545General Photo Ordan, Julien MariusArthur B. McDonald, Physics Nobel Laureate 2015, at CERN colloquiumPhotolabCERN-PHOTO-201709-211Arthur B. McDonald, Physics Nobel Laureate 2015, photographed at CERN colloquium on the "Science of the Sudbury Neutrino Observatory (SNO) and SNOLAB” given in CERN Main Auditorium on Monday 4 Sep 20172017http://cds.cern.ch/record/2282395Personalities and History of CERNhttp://cds.cern.ch/record/2282395oai:cds.cern.ch:2282395General Photo Bennett, Sophia Elizabeth4 September 2017 -Visit by the Swedish Parliamentary Committee on Education members led by Deputy Chair C. NylanderPhotolabCERN-PHOTO-201709-210Mr Christer Nylander Deputy Chair and Members of the Parliamentary Committee on Education Kingdom of Sweden Monday, 4 September 20172017http://cds.cern.ch/record/2282388Personalities and History of CERNhttp://cds.cern.ch/record/2282388oai:cds.cern.ch:2282388General Photo Bennett, Sophia ElizabethHigh-School Student Internship Programme - Portugal and Bulgaria Group PhotoPhotolabCERN-PHOTO-201709-209High-School Student Internship Programme - Portugal and Bulgaria Group Photo2017http://cds.cern.ch/record/2282288Life at CERNhttp://cds.cern.ch/record/2282288oai:cds.cern.ch:2282288General Photo Bennett, Sophia ElizabethPlaying with Protons CPD Course for Greek Primary School Teachers 2017PhotolabCERN-PHOTO-201709-208Playing with Protons CPD Course for Greek Primary School Teachers 20172017http://cds.cern.ch/record/2281820Life at CERNhttp://cds.cern.ch/record/2281820oai:cds.cern.ch:2281820General Photo