Jet properties in PbPb and pp collisions at $\sqrt{^s{NN}}$ = 5.02 TeV

Abstract

Modifications of the properties of jets in PbPb collisions, relative to those in pp collisions, are studied at a nucleon-nucleon center-of-mass energy of \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5.02TeV via correlations of charged particles with the jet axis in relative pseudorapidity $(\Delta\eta)$, relative azimuth $(\Delta\phi)$, and relative angular distance from the jet axis $\Delta$r= $\varDelta \mathrm{r}=\sqrt{{\left(\varDelta \eta \right)}^2+{\left(\varDelta \phi \right)}^2}$This analysis uses data collected with the CMS detector at the LHC, corresponding to integrated luminosities of $404 μb^{−1}$ and $27.4 pb^{−1}$ for PbPb and pp collisions, respectively. Charged particle number densities, jet fragmentation functions, and jet shapes are presented as a function of PbPb collision centrality and charged-particle track transverse momentum, providing a differential description of jet modifications due to interactions with the quark-gluon plasma.

Abstract

Modifications of the properties of jets in PbPb collisions, relative to those in pp collisions, are studied at a nucleon-nucleon center-of-mass energy of \sqrt{s_{\mathrm{N}\;\mathrm{N}}}=5.02TeV via correlations of charged particles with the jet axis in relative pseudorapidity $(\Delta\eta)$, relative azimuth $(\Delta\phi)$, and relative angular distance from the jet axis $\Delta$r= $\varDelta \mathrm{r}=\sqrt{{\left(\varDelta \eta \right)}^2+{\left(\varDelta \phi \right)}^2}$This analysis uses data collected with the CMS detector at the LHC, corresponding to integrated luminosities of $404 μb^{−1}$ and $27.4 pb^{−1}$ for PbPb and pp collisions, respectively. Charged particle number densities, jet fragmentation functions, and jet shapes are presented as a function of PbPb collision centrality and charged-particle track transverse momentum, providing a differential description of jet modifications due to interactions with the quark-gluon plasma.

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