Open and closed heavy-flavour suppression in heavy-ion collisions with CMS

14th International Conference on Strangeness in Quark Matter

Jo, Mihee^1

Korea University, Seoul 136-701, Korea, Republic of^1

关键词: Compact Muon solenoids;    Heavy ion collision;    High multiplicity;    Nuclear modification factors;    Nucleon-nucleon collisions;    Nucleus-nucleus collision;    Pb-Pb collisions;    Quark-gluon plasma;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012012/pdf
DOI  :  10.1088/1742-6596/509/1/012012

来源: IOP

【 摘 要 】

The Compact Muon Solenoid (CMS) is fully equipped to measure quarkonia in the dimuon decay channel in the high multiplicity environment of nucleus-nucleus collisions. Quarkonia are especially relevant for studying the quark-gluon plasma since they are produced at early times and propagate through the medium, mapping its evolution. CMS has measured the nuclear modification factors of non-prompt J/ψ (from b-hadron decays), prompt J/ψ, inclusive ψ(2S), and the first three Υ states in PbPb collisions at 2.76 TeV. A suppression of non-prompt J/ψ, which is sensitive to the in-medium b-quark energy loss, has been measured at relatively high pT(6.5 TThas previously not been observed at RHIC. At mid-rapidity and high pT, ψ(2S) show an even stronger suppression than J/ψ. Furthermore, CMS has measured the suppression of the three Υ states, separately, down to pT=0 GeV/c. A clear ordering of the suppression with binding energy is observed, as expected from sequential melting of quarkonium states.