Abstract
We report the measurements of the prompt and non-prompt J/ψ and ψ(2S) nuclear modification factors (RAA) using pp and PbPb data and the RpPb using pPb data collected by CMS at the LHC. All measurements were performed via the dimuon decay channel. The RAA analysis is based on PbPb and pp data samples collected at √sNN = 5.02 TeV in 2015, corresponding to integrated luminosities of 464 μb−1 and 28 pb−1. These measurements are performed in the dimuon rapidity range of |y| < 2.4 as a function of centrality, rapidity, and transverse momentum (pT) from pT = 3GeV/c in the most forward region and up to 50 GeV/c. The RpPb analysis based on pPb data, is performed for prompt J/ψ and ψ(2S) in different kinematic bins of pT and rapidity.
Highlights
We report the measurements of the prompt and non-prompt J/ψ and ψ(2S) nuclear modification factors (RAA) using pp and PbPb data and the RpPb using pPb data collected by CMS at the LHC
Charmonium states constitute an important probe of the Quark-Gluon Plasma (QGP), since they are produced in the early stage of heavy ion collisions and their yields are sensitive to hot QGP medium [1,2]
Summary The results of the prompt and nonprompt J/ψ meson RAA have been presented in PbPb collisions at √sNN =5.02 TeV, as a function of transverse momentum, and collision centrality in different kinematic ranges
Summary
Charmonium states constitute an important probe of the Quark-Gluon Plasma (QGP), since they are produced in the early stage of heavy ion collisions and their yields are sensitive to hot QGP medium [1,2]. Other non-QGP effects (called Cold Nuclear Matter effects) can affect the production of quarkonium in heavy ion collisions and the regeneration process-an additional source of charmonium could enhance the production of the bound states at higher LHC energy [7,8]. The nonprompt J/ψ component should reflect medium effects on b hadron production in heavy ion collisions, such as b quark energy loss. In pPb collisions, ATLAS [11] and ALICE [12] data show that ψ(2S) suppression, integrated over transverse momentum, is more pronounced than that of the J/ψ In this talk, the measurement of the prompt and non-prompt J/ψ and ψ(2S) RAA using PbPb data, collected at the end of 2015 with the CMS experiment at √sNN = 5.02 TeV were presented. Measurements of the pPb nuclear modification factor of prompt ψ(2S), RpPb in pPb collisions, over the pT range 4–30
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