188 research outputs found

    Measurement of the azimuthal anisotropy of Y(1S) and Y(2S) mesons in PbPb collisions at root s(NN)=5.02 TeV

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    The second-order Fourier coefficients (v(2)) characterizing the azimuthal distributions of Y(1S) and Y(2S) mesons produced in PbPb collisions at root s(NN) = 5.02 TeV are studied. The Y mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The collected data set corresponds to an integrated luminosity of 1.7 nb(-1). The scalar product method is used to extract the v2 coefficients of the azimuthal distributions. Results are reported for the rapidity range vertical bar y vertical bar < 2.4, in the transverse momentum interval 0 < pT < 50 GeV/c, and in three centrality ranges of 10-30%, 30-50% and 50-90%. In contrast to the J/psi mesons, the measured v(2) values for the Y mesons are found to be consistent with zero. (C) 2021 The Author(s). Published by Elsevier B.V.Peer reviewe

    Investigation of in-medium effects of charmonia using azimuthal anisotropy and jet fragmentation function in PbPb collisions at 5.02 TeV with the CMS experiment

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    Quarkonia have been long proposed as the golden probes to study quark-gluon plasma (QGP) in heavy-ion collisions. In this presentation, we present the second- and third-order Fourier coefficients, v2v_2 and v3v_3, for prompt and nonprompt J/ψ\psi mesons in PbPb collisions as functions transverse momentum (pTp_{\rm T}) and PbPb collision centrality. Also, we report the first measurements of v2v_2 and v3v_3 for the prompt ψ\psi(2S) mesons in PbPb collisions. The results provide v2v_2 and v3v_3 values over the wide studied kinematics regions of transverse momentum and collision centrality

    Measurement of the azimuthal anisotropy of ΄\Upsilon(1S) and ΄\Upsilon(2S) mesons in PbPb collisions at sNN=\sqrt{s_\mathrm{NN}} = 5.02 TeV