LHC Results on Charmonium in Heavy Ions

Hong, Byungsik

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CMS Note
Report number	arXiv:1208.1615 ; CMS-CR-2012-163 ; CMS CR-2012/163
Title	LHC Results on Charmonium in Heavy Ions
Author(s)	Hong, Byungsik (Korea U.)
Publication	2012
Collaboration	ATLAS and CMS Collaborations
Imprint	26 Jun 2012
Number of pages	20
Note	Comments: to appear in the proceedings of The 5th International Workshop on Charm Physics (Charm 2012) to appear in the proceedings of The 5th International Workshop on Charm Physics (Charm 2012)
Presented at	CHARM 2012 - 5th International Workshop on Charm Physics, Honolulu, Hawaii, 14 - 17 May 2012
Subject category	Detectors and Experimental Techniques ; Nuclear Physics - Experiment
Accelerator/Facility, Experiment	CERN LHC ; CMS
Abstract	In heavy-ion collisions at high energies, the quantum chromodynamics (QCD) predicts the production of the deconfined quark-gluon plasma (QGP) state. Quarkonia ($c\bar{c}$ or $b\bar{b}$ bound states) are a useful means to probe QGP and to investigate the behavior of QCD under the high parton-density environment. Up to now, the large hadron collider (LHC) at CERN provided two runs for PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV in the years 2010 and 2011. The ALICE, ATLAS, and CMS experiments at LHC have analyzed the yields and spectra of the $J/\psi$ and $\Upsilon$ families. In this article, we review particularly the recent charmonium results in PbPb collisions at LHC from the 2010 run.
Other source	Inspire
Copyright/License	Preprint: (License: CC-BY-4.0)

$Nuclear modification factor $R_{AA}$ of $\Upsilon$(1$S$), integrated over centrality, as functions of $p_{T}$ (left) and $y$ (right) in PbPb collisions at $\sqrt{s_{NN}}$ = 2.76 TeV from CMS \cite{cms1}. $R_{AA}$ is integrated over $|y| <$ 2.4 for the $p_{T}$ dependence and over 0 $< p_{T} <$ 20 GeV/$c$ for the $y$ dependence. The grey boxes at $R_{AA}$ = 1 represent global scale uncertainties of 6\% originating from the integrated luminosity of the $pp$ data sample. The statistical and systematic uncertainties are shown by bars and boxes, respectively. The CMS data are compared to the calculations by the anisotropic hydrodynamic model with different options for the ratio of plasma shear viscosity to entropy density $4\pi\eta/S$ \cite{strick1}. See the text for the details.$ $noimgMasses, binding energies, and radii of various charmonium states from non-relativistic potential model \cite{satz1,satz2}.$ $Invariant mass distributions of $\mu^{+}\mu^{-}$ pairs for $p_{T}^{\mu} >$ 4 GeV/$c$ in $pp$ (top) and PbPb (bottom) collisions at $\sqrt{s_{NN}}$ = 2.76 TeV from CMS \cite{cms-u}. The solid lines are the fit functions described in the text.$ Show more plots

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Element opprettet 2012-07-30, sist endret 2023-03-17

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