Bottomonium suppression atsNN=2.76TeV using a model based on color screening and gluonic dissociation with collisional damping

Abstract

We present a model to explain the bottomonium suppression in Pb$+$Pb collisions at midrapidity obtained from Large Hadron Collider (LHC) energy, $\sqrt{{s}_{NN}}=2.76$ TeV. The model consists of two decoupled mechanisms, namely, color screening during bottomonium production followed by gluon induced dissociation along with collisional damping. The quasiparticle model (QPM) is used as equation of state (EOS) for the quark-gluon plasma (QGP) medium. The feed-down from higher $\ensuremath{\Upsilon}$ states, such as $\ensuremath{\Upsilon}(1P)$, $\ensuremath{\Upsilon}(2S)$, and $\ensuremath{\Upsilon}(2P)$, dilated formation times for bottomonium states, and viscous effect of the QGP medium are other ingredients included in the current formulation. We further assume that the QGP is expanding according to ($1+1$)-dimensional Bjorken's boost invariant scaling law. The net suppression (in terms of ${p}_{T}$ integrated survival probability) for bottomonium states at midrapidity is obtained as a function of centrality, and the result is then compared both quantitatively and qualitatively with the recent LHC experimental data in the midrapidity region recently published by the CMS Collaboration. We find that the current model, based on Debye color screening plus gluonic dissociation along with collisional damping, better describes the centrality dependence of bottomonium suppression at LHC energy as compared to the color screening model alone.