Description and performance of track and primary-vertex reconstruction with the CMS tracker

2014
Authors
Chatrchyan, S.Adžić, Petar
Đorđević, Miloš

Ekmedzic, M.

Milošević, Jovan

Milenović, Predrag

Rekovic, V.
CMS Collaboration (ukupan broj autora: 2412)
Article
Metadata
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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) GT 0.9GeV is 94% for pseudorapidities of vertical bar eta vertical bar LT 0.9 and 85% for 0.9 LT vertical bar eta vertical bar LT 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 LT 1.4, t...he 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.
Keywords:
Pattern recognition / Large detector-systems performance / Performance of High Energy Physics Detectors / cluster finding / calibration and fitting methodsSource:
Journal of Instrumentation, 2014, 9Projects:
- Science and Technology Facilities Council [CMS]
DOI: 10.1088/1748-0221/9/10/P10009
ISSN: 1748-0221
WoS: 000345858500052
Scopus: 2-s2.0-84908341975
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VinčaTY - JOUR AU - Chatrchyan, S. AU - Adžić, Petar AU - Đorđević, Miloš AU - Ekmedzic, M. AU - Milošević, Jovan AU - Milenović, Predrag AU - Rekovic, V. PY - 2014 UR - http://vinar.vin.bg.ac.rs/handle/123456789/253 AB - 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) GT 0.9GeV is 94% for pseudorapidities of vertical bar eta vertical bar LT 0.9 and 85% for 0.9 LT vertical bar eta vertical bar LT 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 LT 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. T2 - Journal of Instrumentation T1 - Description and performance of track and primary-vertex reconstruction with the CMS tracker VL - 9 DO - 10.1088/1748-0221/9/10/P10009 ER -
@article{ author = "Chatrchyan, S. and Adžić, Petar and Đorđević, Miloš and Ekmedzic, M. and Milošević, Jovan and Milenović, Predrag and Rekovic, V.", year = "2014", url = "http://vinar.vin.bg.ac.rs/handle/123456789/253", 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) GT 0.9GeV is 94% for pseudorapidities of vertical bar eta vertical bar LT 0.9 and 85% for 0.9 LT vertical bar eta vertical bar LT 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 LT 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.", journal = "Journal of Instrumentation", title = "Description and performance of track and primary-vertex reconstruction with the CMS tracker", volume = "9", doi = "10.1088/1748-0221/9/10/P10009" }
Chatrchyan S, Adžić P, Đorđević M, Ekmedzic M, Milošević J, Milenović P, Rekovic V. Description and performance of track and primary-vertex reconstruction with the CMS tracker. Journal of Instrumentation. 2014;9
Chatrchyan, S., Adžić, P., Đorđević, M., Ekmedzic, M., Milošević, J., Milenović, P.,& Rekovic, V. (2014). Description and performance of track and primary-vertex reconstruction with the CMS tracker. Journal of Instrumentation, 9. https://doi.org/10.1088/1748-0221/9/10/P10009
Chatrchyan S., Adžić Petar, Đorđević Miloš, Ekmedzic M., Milošević Jovan, Milenović Predrag, Rekovic V., "Description and performance of track and primary-vertex reconstruction with the CMS tracker" 9 (2014), https://doi.org/10.1088/1748-0221/9/10/P10009 .