Artículos de revistas
Description and performance of track and primary-vertex reconstruction with the CMS tracker
Fecha
2014-10-01Registro en:
Journal Of Instrumentation. Bristol: Iop Publishing Ltd, v. 9, 82 p., 2014.
1748-0221
10.1088/1748-0221/9/10/P10009
WOS:000345858500052
WOS000345858500052.pdf
0000-0003-0471-8549
Autor
Yerevan Phys Inst
OeAW
Natl Ctr Particle & High Energy Phys
Univ Antwerp
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Inst Nucl Energy Res
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Institución
Resumen
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.