Quarkonia suppression in PbPb collisions at sqrt[s_{NN}]=2.76 TeV

We estimate the modification of quarkonia yields due to different processes in the medium produced in Pb+Pb collisions at LHC energy. The quarkonia and heavy flavour cross sections calculated up to next-to-leading order (NLO) are used in the study. Shadowing corrections are obtained with the NLO EPS09 parametrization. A kinetic model is employed which incorporates quarkonia suppression inside a QGP, suppression due to hadronic comovers, and regeneration from charm pairs. The quarkonia dissociation cross section due to gluon collisions has been considered and the regeneration rate has been obtained using the principle of detailed balance. The modification in quarkonia yields due to collisions with hadronic comovers has been estimated assuming that the comovers are pions. The manifestations of these effects on the nuclear modification factors for both J/ψ and Υ in different kinematic regions has been demonstrated for Pb+Pb collisions at √ s NN = 2.76 TeV in comparison with the measurements. Both the suppression and regeneration due to a deconfined medium strongly affect the low and intermediate p T range. The large observed suppression of J/ψ at p T > 10 GeV/ c exceeds the estimates of suppression by gluon dissociation.

[1]  P. Shukla,et al.  Overview of quarkonia and heavy flavour measurements by CMS , 2014, 1405.3810.

[2]  J. Schukraft.  Heavy Ion Physics at the LHC: What's new ? What's next ? , 2013, 1311.1429.

[3]  M. Planinić,et al.  Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at sqrt(sNN)=2.76 TeV , 2013 .

[4]  C. Mironov.  Overview of results on heavy flavour and quarkonia from the CMS collaboration , 2013 .

[5]  A. Andronic,et al.  The statistical model in Pb–Pb collisions at the LHC , 2012, 1210.7724.

[6]  P. Shukla,et al.  SUPPRESSION OF BOTTOMONIA STATES IN FINITE SIZE QUARK–GLUON PLASMA IN PbPb COLLISIONS AT LARGE HADRON COLLIDER , 2012, 1210.7584.

[7]  R. Nelson,et al.  Narrowing the uncertainty on the total charm cross section and its effect on the J/ψ cross section , 2012, 1210.4610.

[8]  V. Kumar,et al.  Components of the dilepton continuum in Pb+Pb collisions at sqrt s = 2.76 TeV , 2012, 1205.3860.

[9]  B. Wyslouch,et al.  First Results from Pb+Pb Collisions at the LHC , 2012, 1202.3233.

[10]  X. Zhao,et al.  Bottomonia in the quark-gluon plasma and their production at RHIC and LHC , 2011, 1111.6537.

[11]  V. M. Ghete,et al.  Indications of suppression of excited Υ states in Pb-Pb collisions at √(s(NN))=2.76 TeV. , 2011, Physical review letters.

[12]  C. Collaboration,et al.  Dependence on pseudorapidity and centrality of charged hadron production in PbPb collisions at a nucleon-nucleon centre-of-mass energy of 2.76 TeV , 2011, 1107.4800.

[13]  Zebo Tang.  J/ψ production and correlation in p+p and Au+Au collisions at STAR , 2011, 1107.0532.

[14]  M. Strickland.  Thermal Υ(1s) and χb1 Suppression at √(s(NN))=2.76 TeV Pb-Pb collisions at the LHC. , 2011, Physical review letters.

[15]  Jr.,et al.  J/ψ suppression at forward rapidity in Au + Au collisions at √sNN=200 GeV , 2011, 1103.6269.

[16]  R. Rapp,et al.  Medium modifications and production of charmonia at LHC , 2011, 1102.2194.

[17]  C. Collaboration,et al.  Observation and studies of jet quenching in PbPb collisions at nucleon-nucleon center-of-mass energy = 2.76 TeV , 2011, 1102.1957.

[18]  J. G. Contreras,et al.  Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at √sNN=2.76 TeV , 2010, 1012.1657.

[19]  V. Papadimitriou,et al.  Heavy quarkonium: progress, puzzles, and opportunities , 2010, 1010.5827.

[20]  J. Huston,et al.  New parton distributions for collider physics , 2010, 1007.2241.

[21]  P. Petreczky,et al.  QCD Equation of State and Hadron Resonance Gas , 2009, 0912.2541.

[22]  K. Eskola,et al.  EPS09: A New Generation of NLO and LO Nuclear Parton Distribution Functions , 2009, 0902.4154.

[23]  C. Lourenço,et al.  Energy dependence of J/ψ absorption in proton-nucleus collisions , 2009 .

[24]  L. Kluberg,et al.  Color Deconfinement and Charmonium Production in Nuclear Collisions , 2009, 0901.3831.

[25]  M. Cacciari.  QCD predictions for charm and bottom production at RHIC , 2005, hep-ph/0512251.

[26]  M. Mangano,et al.  Momentum spectra of charmonium produced in a quark-gluon plasma , 2005, nucl-th/0505055.

[27]  P.Braun-Munzinger,et al.  Statistical hadronization of charm in heavy-ion collisions at SPS, RHIC and LHC , 2003, nucl-th/0303036.

[28]  T. Gousset,et al.  Heavy-quarkonium hadron cross section in QCD at leading twist , 2001, hep-ph/0102095.

[29]  M. Schroedter,et al.  Enhanced $J/\psi$ production in deconfined quark matter , 2000, hep-ph/0007323.

[30]  A. Vogt,et al.  Pionic parton distributions , 1992 .

[31]  E. Shuryak,et al.  Two-stage equilibration in high energy heavy ion collisions. , 1992, Physical review letters.

[32]  H. Satz,et al.  Color screening and deconfinement for bound states of heavy quarks , 1988 .

[33]  R. Vogt,et al.  Jψ interactions with hot hadronic matter , 1988 .

[34]  G. Bhanot,et al.  Short-distance analysis for heavy-quark systems: (II). Applications , 1979 .

[35]  T. B. Skaali,et al.  Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at √sNN=5.02 TeV , 2017 .

[36]  Centrality , rapidity and transverse momentum dependence of J / ψ suppression in Pb – Pb collisions at √ s NN = 2 . 76 TeV , 2014 .

[37]  Xin-Nian Wang,et al.  N ov 1 99 5 LBL-37985 , CERN-TH / 95-304 J / ψ Suppression in an Equilibrating Parton Plasma , 2014 .

[38]  T. Matsui.  J/Y Suppression by Quark-Gluon Plasma Formation , 2002 .