Quarkonia suppression in PbPb collisions atsNN=2.76TeV

Abstract

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,

Heavy vector and axial-vector mesons in hot and dense asymmetric strange hadronic matter

“…This causes negative and positive values of the scattering length for D * N and D 1 N, scattering, respectively in the presence of finite magnetic field [59,88]. In the absence of magnetic field, the in-medium mass of heavy vector and axial-vector have also been studied in the literature [59,60,88]. However, in our knowledge, no work is available till date which study the impact of magnetic field on the vector and axial-vector D mesons.…”

“…[17,53], we also calculated the in-medium mass of charmonia and bottomonia in the presence of the magnetic field and found an attractive mass shift. Extensive work is done on the in-medium effects without considering the magnetic field [8,[59][60][61]. For instance, unification of Operator Product Expansion (OPE) and Borel transformation on the current-current correlation function was applied to equate the mass and various condensates [31,32].…”

“…Using QCD sum rules and chiral SU(3) model, author evaluated the shift in decay constants and mass of vector and axial-vector mesons [59]. In this article, they observed attractive interaction for vector D * and B * mesons whereas, repulsive interaction for axial-vector D 1 and B 1 mesons in hadronic medium.…”

Constraining Heavy Quark Energy Loss Using B and D Mesons in Heavy Ion Collision.

“…[22]. The entropy conservation condition s(T )V (τ) = s(T 0 )V (τ 0 ) and equation of state obtained by Lattice QCD along with hadronic resonance are used to obtain temperature as a function of proper time [23]. The transverse size R for a given centrality with number of participant N part is obtained as R(N part ) = R A 2 A/N part , where R A is radius of the nucleus.…”

Quarkonia results in heavy-ion collisions from CMS

“…This is thought to be a direct effect of deconfinement, when the binding potential between the constituents of a quarkonium state, a heavy quark and its antiquark, is screened by the colour charges of the surrounding light quarks and gluons. The suppression is predicted to occur above the critical temperature of the medium (T c ) and depends on the QQ binding energy alternatively the suppression can be understood in terms of quarkonium dissociation by collisions with gluons [2,3].…”