“School of Particles And Accelerator”
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| Paper IPM / Particles And Accelerator / 11517 |
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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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