Medium modifications and production of charmonia at LHC

Zhao, Xingbo; Rapp, Ralf

doi:10.1016/j.nuclphysa.2011.05.001

Cited by 278 publications

(309 citation statements)

References 48 publications

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“…The low p T J=c R AA can be qualitatively understood with models including full [10,11] or partial [12,13] regeneration of J=c from deconfined charm quarks in the medium. This mechanism was first proposed by the statistical hadronization model, which assumes deconfinement and thermal equilibrium of the bulk of c " c pairs to produce J=c at the phase boundary by statistical hadronization only [10].…”

mentioning

confidence: 99%

“…This mechanism was first proposed by the statistical hadronization model, which assumes deconfinement and thermal equilibrium of the bulk of c " c pairs to produce J=c at the phase boundary by statistical hadronization only [10]. Later, the transport models proposed a dynamical competition between the J=c suppression by the QGP and the regeneration mechanism, which enables them to also describe the J=c R AA versus p T [12,13]. More differential studies, like the J=c elliptic flow, could help to assess the assumption of charm quark thermalization in the medium.…”

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confidence: 99%

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J/ψElliptic Flow in Pb-Pb Collisions atsNN=2.76 TeV

Abbas¹,

Abelev²,

Adam³

et al. 2013

Phys. Rev. Lett.

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confidence: 99%

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confidence: 99%

J/ψElliptic Flow in Pb-Pb Collisions atsNN=2.76 TeV

Abbas¹,

Abelev²,

Adam³

et al. 2013

Phys. Rev. Lett.

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“…where a T = 0.1 c 2 fm −1 is the transverse acceleration [22]. The initial transverse size, R, as a function of centrality is…”

Section: Modification Of Quarkonia In the Presence Of Qgpmentioning

confidence: 99%

“…The quarkonia yields in heavy-ion collisions are modified by non-QGP effects such as shadowing, due to the modification of the parton distribution functions inside the nucleus, and dissociation due to hadronic or comover interaction [21]. There have been many recent calculations to explain the LHC quarkonia results using a combination of the above frameworks [22,23] as well as viscous hydrodynamics [24].…”

Section: Introductionmentioning

confidence: 99%

Quarkonia suppression in PbPb collisions atsNN=2.76TeV

2015

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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 N N = 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. PACS numbers: 12.38.Mh, 24.85.+p,

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“…At LHC energies, in addition to the originally proposed J/ψ suppression due to colour screening, the production of J/ψ due to (re-)combination of charm quarks is suggested as an additional mechanism in two theoretical approaches: the statistical hadronisation at the confinement phase boundary [2,3] and transport models [4,5,6]. The latter assume destruction and production of charmonium states predominantly during the deconfined stage of the system evolution in addition to the primordial production.…”

Section: Introductionmentioning

confidence: 99%

Inclusive <mml:math altimg="si1.gif" overflow="scroll" xmlns:xocs="http://www.elsevier.com/xml/xocs/dtd" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.elsevier.com/xml/ja/dtd" xmlns:ja="http://www.elsevier.com/xml/ja/dtd" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:tb="http://www.elsevier.com/xml/common/table/dtd" xmlns:sb="http://www.elsevier.com/xml/common/struct-bib/dtd" xmlns:ce="http://www.elsevier.com/xml/common/dtd" xm

Winn

2014

Nuclear Physics A

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We report on the inclusive J/ψ nuclear modification factor in p-Pb collisions at √ s NN = 5.02 TeV as a function of rapidity y and transverse momentum p T . The experimental coverage extends down to p T = 0 GeV/c in the three rapidity ranges accessible by ALICE (−4.46 < y cms < −2.96, −1.37 < y cms < 0.46, 2.03 < y cms < 3.53). The obtained results as a function of rapidity are in agreement with theory predictions based only on shadowing or on coherent energy loss. At forward and backward rapidity, the ψ(2S) measurement complements the J/ψ results. The ratio between the ψ(2S) and J/ψ cross section is significantly smaller in p-Pb than in pp collisions in both rapidity regions.The seminal paper from T. Matsui and H. Satz [1] published in 1986 initiated intense theoretical and experimental studies of J/ψ production as a probe of deconfinement in nucleus-nucleus (AA) collisions. At LHC energies, in addition to the originally proposed J/ψ suppression due to colour screening, the production of J/ψ due to (re-)combination of charm quarks is suggested as an additional mechanism in two theoretical approaches: the statistical hadronisation at the confinement phase boundary [2,3] and transport models [4,5,6]. The latter assume destruction and production of charmonium states predominantly during the deconfined stage of the system evolution in addition to the primordial production. In this context, the investigation of charmonia in p-Pb collisions at the LHC represents a crucial ingredient for the interpretation of J/ψ AA-measurements. It gives access to nuclear effects, which are not attributable to deconfinement, but can alter the nuclear modification factor R AA = N J/ψ,AA /(< T AA > ·σ J/ψ,pp ). N J/ψ,AA represents in this formula the efficiency corrrected J/ψ-yield per event in AA collisions, T AA denotes the nuclear overlap function and σ J/ψ,pp the J/ψ cross section in proton-proton (pp) collisions at the same centre of mass energy per nucleon-nucleon collision.ALICE has measured J/ψ in p-Pb collisions at a centre of mass energy of 5.02 TeV in the central barrel detectors with a pseudorapidity acceptance |η lab,track | < 0.9 via the dielectron decay channel and in the forward spectrometer with an acceptance of 2.5 < η lab,muon < 4.0 via the dimuon decay channel. A description of the experiment can be found in [7]. An inversion of the beam direction has enabled the muon spectrometer to measure the J/ψ on the proton and on the lead fragmentation side in the asymmetric p-Pb collision system. In the following, the rapidity of the incoming proton is chosen to be positive, which fixes the rapidity sign convention of the dimuon pair. The centre of mass system of the two colliding projectiles is boosted with respect to the laboratory frame system by ∆y = 0.465 resulting in slightly asymmetric rapidity coverages with respect to y = 0: −4.46 < y cms < −2.96 at backward, −1.37 < y cms < 0.43 at central rapidity and 2.03 < y cms < 3.53 at forward rapidity. In the dimuon acceptance, the J/ψ production was measured in six ...

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Medium modifications and production of charmonia at LHC

Cited by 278 publications

References 48 publications

J/ψElliptic Flow in Pb-Pb Collisions atsNN=2.76 TeV

J/ψElliptic Flow in Pb-Pb Collisions atsNN=2.76 TeV

Quarkonia suppression in PbPb collisions atsNN=2.76TeV

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