Description and performance of track and primary-vertex reconstruction with the CMS tracker
Contribuinte(s) |
Universidade Estadual Paulista (UNESP) |
---|---|
Data(s) |
18/03/2015
18/03/2015
01/10/2014
|
Resumo |
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. |
Formato |
82 |
Identificador |
http://dx.doi.org/10.1088/1748-0221/9/10/P10009 Journal Of Instrumentation. Bristol: Iop Publishing Ltd, v. 9, 82 p., 2014. 1748-0221 http://hdl.handle.net/11449/116985 10.1088/1748-0221/9/10/P10009 WOS:000345858500052 WOS000345858500052.pdf |
Idioma(s) |
eng |
Publicador |
Iop Publishing Ltd |
Relação |
Journal Of Instrumentation |
Direitos |
openAccess |
Palavras-Chave | #Pattern recognition, cluster finding, calibration and fitting methods #Large detector-systems performance #Performance of High Energy Physics Detectors |
Tipo |
info:eu-repo/semantics/article |