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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/116985
Title: 
Description and performance of track and primary-vertex reconstruction with the CMS tracker
Author(s): 
Institution: 
  • Yerevan Phys Inst
  • OeAW
  • Natl Ctr Particle & High Energy Phys
  • Univ Antwerp
  • Vrije Univ Brussel
  • Univ Libre Bruxelles
  • Univ Ghent
  • Catholic Univ Louvain
  • Univ Mons
  • Ctr Brasileiro Pesquisas Fis
  • Universidade do Estado do Rio de Janeiro (UERJ)
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal do ABC (UFABC)
  • Inst Nucl Energy Res
  • Univ Sofia
  • Inst High Energy Phys
  • Peking Univ
  • Univ Los Andes
  • Tech Univ Split
  • Univ Split
  • Inst Rudjer Boskov
  • Univ Cyprus
  • Charles Univ Prague
  • Acad Sci Res & Technol Arab Republ Egypt
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  • Ecole Polytech
  • Univ Strasbourg
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  • Rhein Westfal TH Aachen
  • Deutsch Elekt Synchrotron
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  • Univ Ioannina
  • Wigner Res Ctr Phys
  • Inst Nucl Res ATOMKI
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  • Inst Res Fundamental Sci IPM
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  • CERN
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  • Isfahan Univ Technol
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  • Horia Hulubei Natl Inst Phys & Nucl Engn
  • Univ Siena
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  • Albert Einstein Ctr Fundamental Phys
  • Gaziosmanpasa Univ
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  • Cag Univ
  • Mersin Univ
  • Izmir Inst Technol
  • Ozyegin Univ
  • Kafkas Univ
  • Istanbul Univ
  • Mimar Sinan Univ
  • Kahramanmaras Sutcu Imam Univ
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  • Argonne Natl Lab
  • Erzincan Univ
  • Yildiz Tekn Univ
  • Texas A&M Univ Qatar
ISSN: 
1748-0221
Abstract: 
A description is provided of the software algorithms developed for the CMS tracker both for reconstructing charged-particle trajectories in proton-proton interactions and for using the resulting tracks to estimate the positions of the LHC luminous region and individual primary-interaction vertices. Despite the very hostile environment at the LHC, the performance obtained with these algorithms is found to be excellent. For t (t) over bar events under typical 2011 pileup conditions, the average track-reconstruction efficiency for promptly-produced charged particles with transverse momenta of p(T) > 0.9GeV is 94% for pseudorapidities of vertical bar eta vertical bar < 0.9 and 85% for 0.9 < vertical bar eta vertical bar < 2.5. The inefficiency is caused mainly by hadrons that undergo nuclear interactions in the tracker material. For isolated muons, the corresponding efficiencies are essentially 100%. For isolated muons of p(T) = 100GeV emitted at vertical bar eta vertical bar < 1.4, the resolutions are approximately 2.8% in p(T), and respectively, 10 m m and 30 mu m in the transverse and longitudinal impact parameters. The position resolution achieved for reconstructed primary vertices that correspond to interesting pp collisions is 10-12 mu m in each of the three spatial dimensions. The tracking and vertexing software is fast and flexible, and easily adaptable to other functions, such as fast tracking for the trigger, or dedicated tracking for electrons that takes into account bremsstrahlung.
Issue Date: 
1-Oct-2014
Citation: 
Journal Of Instrumentation. Bristol: Iop Publishing Ltd, v. 9, 82 p., 2014.
Time Duration: 
82
Publisher: 
Iop Publishing Ltd
Keywords: 
  • Pattern recognition, cluster finding, calibration and fitting methods
  • Large detector-systems performance
  • Performance of High Energy Physics Detectors
Source: 
http://dx.doi.org/10.1088/1748-0221/9/10/P10009
URI: 
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/116985
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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