Journal
EUROPEAN PHYSICAL JOURNAL C
Volume 70, Issue 4, Pages 1165-1192Publisher
SPRINGER
DOI: 10.1140/epjc/s10052-010-1491-3
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Funding
- Science and Technology Facilities Council [ST/G502347/1, ST/F007434/1, ST/H000992/1, ST/H000925/1, GRIDPP, ST/G502412/1, PP/E002722/1, ST/I505572/1, ST/F007094/1, ST/I002839/1, ST/I000410/1, ST/I002200/1, ST/F006748/1, PP/D004284/1, CMS] Funding Source: researchfish
- STFC [ST/H000992/1, ST/G502347/1, ST/H00081X/2, ST/I505572/1, ST/F006748/1, ST/H000925/1, ST/I000410/1, PP/E002722/1, ST/I002200/1, ST/F007094/1, ST/G502412/1, ST/I002839/1, ST/F007434/1] Funding Source: UKRI
- Division Of Physics
- Direct For Mathematical & Physical Scien [0906479] Funding Source: National Science Foundation
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The first LHC pp collisions at centre-of-mass energies of 0.9 and 2.36 TeV were recorded by the CMS detector in December 2009. The trajectories of charged particles produced in the collisions were reconstructed using the all-silicon Tracker and their momenta were measured in the 3.8 T axial magnetic field. Results from the Tracker commissioning are presented including studies of timing, efficiency, signal-to-noise, resolution, and ionization energy. Reconstructed tracks are used to benchmark the performance in terms of track and vertex resolutions, reconstruction of decays, estimation of ionization energy loss, as well as identification of photon conversions, nuclear interactions, and heavy-flavour decays.
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