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

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2014
249.pdf (2.835Mb)
Authors
Chatrchyan, S.
Adžić, Petar
Đorđević, Miloš
Ekmedzic, M.
Milošević, Jovan
Milenović, Predrag
Rekovic, V.
CMS Collaboration (ukupan broj autora: 2412)
Article
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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, 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 methods
Source:
Journal of Instrumentation, 2014, 9
Projects:
  • Science and Technology Facilities Council [CMS]

DOI: 10.1088/1748-0221/9/10/P10009

ISSN: 1748-0221

WoS: 000345858500052

Scopus: 2-s2.0-84908341975
[ Google Scholar ]
220
259
URI
http://vinar.vin.bg.ac.rs/handle/123456789/253
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  • WoS Import
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Vinča
TY  - 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 .

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