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dc.contributor.authorAdair, A.
Akgun, B.
Ecklund, K.M.
Geurts, F.J.M.
Li, W.
Michlin, B.
Padley, B.P.
Redjimi, R.
Roberts, J.
Zabel, J.
dc.date.accessioned 2015-04-20T15:44:18Z
dc.date.available 2015-04-20T15:44:18Z
dc.date.issued 2014
dc.identifier.citation Adair, A., Akgun, B., Ecklund, K.M., et al.. "Description and performance of track and primary-vertex reconstruction with the CMS tracker." Journal of Instrumentation, 9, (2014) IOP Publishing: P10009. http://dx.doi.org/10.1088/1748-0221/9/10/P10009.
dc.identifier.urihttps://hdl.handle.net/1911/79481
dc.description.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 tbar t events under typical 2011 pileup conditions, the average track-reconstruction efficiency for promptly-produced charged particles with transverse momenta of pT > 0.9GeV is 94% for pseudorapidities of |η| < 0.9 and 85% for 0.9 < |η| < 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 pT = 100GeV emitted at |η| < 1.4, the resolutions are approximately 2.8% in pT, and respectively, 10μm and 30μm in the transverse and longitudinal impact parameters. The position resolution achieved for reconstructed primary vertices that correspond to interesting pp collisions is 10–12μm 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.
dc.language.iso eng
dc.publisher IOP Publishing
dc.rights This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/
dc.title Description and performance of track and primary-vertex reconstruction with the CMS tracker
dc.type Journal article
dc.citation.journalTitle Journal of Instrumentation
dc.subject.keywordperformance of High Energy Physics Detectors
large detector-systems performance
pattern recognition, cluster finding, calibration and fitting methods
dc.citation.volumeNumber 9
dc.type.dcmi Text
dc.identifier.doihttp://dx.doi.org/10.1088/1748-0221/9/10/P10009
dc.type.publication publisher version
dc.citation.firstpage P10009
local.author.orderDisplay CMS Collaboration


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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Except where otherwise noted, this item's license is described as This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.