B → J/ψ measurement in PbPb at √s_NN = 2.76 TeV using CMS

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Théâtre National (Centre Bonlieu)

Théâtre National

Centre Bonlieu

Board: 65
Poster Heavy flavor and quarkonia production


Collaboration CMS (UCLouvain)


Measuring open heavy flavor at $\sqrt(s_{NN})=2.76$~TeV will test the theoretical calculations on the $J/\psi$ suppression at RHIC compared to LHC. With the CMS high resolution tracking, we are able to separate prompt $J/\psi$ from non-prompt $J/\psi$ in heavy ion collisions, thus disentangling yield modifications on primary J\$\psi$ from those coming from Bs that decay outside the medium. The long life-time of the b-hadron determines his decay products to be produced further away from the primary vertex. This makes possible the separation of the prompt from the non-prompt $J/\psi$ based on their distance to the primary vertex. To determine the fraction of non-prompt $J/\psi$ from b-hadron decays in data, we performed a 2D unbinned maximum-likelihood fit in mass and pseudo-proper decay length, binned in transverse momentum, rapidity and centrality bins. This poster presents the first measurement of the prompt and non-prompt $J/\psi$ production in the di-muon decay channel as a function of transverse momentum, rapidity and centrality in PbPb collisions at $\sqrt{s_{NN}} = 2.76$~TeV.

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