Abstract
Inclusive jet spectra from pp and PbPb collisions at a nucleon-nucleon center-of-mass energy of 2.76 TeV, collected with the CMS detector at the LHC, are presented. Jets are reconstructed with three different distance parameters (R = 0.2, 0.3, and 0.4) for transverse momentum (pT) greater than 70 GeV and pseudorapidity abs(eta) < 2. Next-to-leading-order quantum chromodynamic calculations with non-perturbative corrections are found to over-predict jet production cross sections in pp for small distance parameters. The jet nuclear modification factors for PbPb compared to pp collisions, show a steady decrease from peripheral to central events, along with a weak dependence on the jet pT. They are found to be independent of the distance parameter in the measured kinematic range.
Highlights
Heavy ion collisions at the CERN Large Hadron Collider (LHC) can generate a hot and dense deconfined state of matter, known as the quark-gluon plasma (QGP)
The inclusive jet cross sections in pp collisions at 2.76 TeV are shown in Fig. 4 for three different distance parameters
The NP correction factors need to be added and are computed as the ratio of cross sections calculated with leading order (LO) + parton shower (PS) + multiparton interactions + hadronization to LO+PS [48]
Summary
Heavy ion collisions at the CERN Large Hadron Collider (LHC) can generate a hot and dense deconfined state of matter, known as the quark-gluon plasma (QGP) In these collisions, hard scattered partons are expected to be attenuated due to elastic and inelastic interactions with the produced medium [1,2,3]. [4], and is indirectly confirmed by measurements of spectra and correlations of high transverse momenta (pT) hadrons at the BNL Relativistic Heavy Ion Collider (RHIC) [5,6,7,8] and LHC [9,10,11] In these measurements, jet quenching is observed to have a dependence on event multiplicity and hadron pT, and has provided significant insights, including the color opaqueness of the QGP.
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