Abstract
An overview of the most recent results on jet quenching physics obtained using PbPb and pPb collision data collected with the CMS experiment at sNN=2.76 TeV and sNN=5.02 TeV, respectively, will be presented. These measurements make use of many different observables, including momentum imbalance, nuclear modification factor RAA and RpA, as well as flavor dependence of jet quenching, jet shapes and jet fragmentation functions. All these measurements in PbPb and pPb collisions will be presented and compared measurements from reference results. Since many of these observables have low correlation to one-another they serve as useful independent consraints to the nature of the parton energy loss mechanism.
Highlights
Heavy ion collisions at the Large Hadron Collider (LHC) present a great opportunity to study the phases of nuclear matter predicted by Quantum Chromodynamics (QCD), the theory of the strong interaction
High transverse momentum partons produced by the initial hard scatterings in heavy ion collisions are expected to suffer energy loss due to strong interactions [1], in a phenomenon known as “jet quenching” that has been discovered at the Relativistic Heavy-Ion Collider (RHIC)
PbPb measurements are compared with observations in 2.76 TeV pp collisions to probe for distortions from energy loss in the hot and dense medium
Summary
Heavy ion collisions at the Large Hadron Collider (LHC) present a great opportunity to study the phases of nuclear matter predicted by Quantum Chromodynamics (QCD), the theory of the strong interaction. Jets originating from hard scatterings of partons are a powerful probe of the hot, dense matter created in heavyion collisions. This medium is commonly referred to as a Quark-Gluon Plasma (QGP). High transverse momentum partons produced by the initial hard scatterings in heavy ion collisions are expected to suffer energy loss due to strong interactions [1], in a phenomenon known as “jet quenching” that has been discovered at the Relativistic Heavy-Ion Collider (RHIC). The Compact Muon Solenoid (CMS) [2] detector has been used to study parton energy loss in the QGP with leading particle and jet coincidence measurements.
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