Abstract
Large transverse momentum jets provide unique tools to study dense QCD matter in high-energy heavy-ion collisions. Results from RHIC on suppression of high transverse momentum particles in Au + Au collisions indicate a significant energy loss of leading partons in the dense and strongly interacting matter formed in these collisions. The LHC will collide Pb ions at [Formula: see text], where the cross section of hard scattering will increase dramatically. Large production rates, the large acceptance of the CMS calorimeters and tracking system, combined with the capability of triggering on jets, will extend the transverse momentum reach of charged particle spectra and nuclear modification factors up to pT > 200 GeV / c .
Highlights
The abundance of high Q2 processes at LHC energies will provide large samples of high ET jets, large pT hadrons, and jets produced opposite to gauge bosons (γ⋆, Z).[1]
The strong interest in these observables in heavy-ion collisions stems from the concept that high ET quark and gluon jets can be used to probe the hot and dense medium produced in the collision, because they are affected by the properties of the medium as they propagate through this dense environment
Partons with high transverse momentum are predicted to suffer radiative and collisional energy loss in the created medium, suppressing the yield of jets and particles found with high transverse energy in a heavy-ion collision, compared to the p+p collision case
Summary
The abundance of high Q2 processes at LHC energies will provide large samples of high ET jets, large pT hadrons, and jets produced opposite to gauge bosons (γ⋆, Z).[1]. The performance of the CMS detector for Pb+Pb events was extensively studied in full simulations with realistic assumptions for particle multiplicity, jet and hadron spectra.[4] The charged particle reconstruction capabilities using the CMS Silicon Tracking System are evaluated using a full detector simulation, assuming a charged particle density in central Pb+Pb collisions of dNch/dy = 3200. In this high multiplicity environment, an algorithmic tracking efficiency of about 80% is achieved, with less than 5% fake track rate for pT > 1 GeV/c and excellent momentum resolution, ∆pT/pT < 1.5% (for pT < 100 GeV/c). The energy resolution for jets with 100 GeV transverse energy at η ≈ 0 is about 16%.7
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