Measurements of the azimuthal anisotropy of prompt and nonprompt charmonia in PbPb collisions at $ \sqrt{s_{\textrm{NN}}} $ = 5.02 TeV
(2023) Journal of High Energy Physics — Vol. 10 (2023)
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- The second-order (v$_{2}$) and third-order (v$_{3}$) Fourier coefficients describing the azimuthal anisotropy of prompt and nonprompt (from b-hadron decays) J/ψ, as well as prompt ψ(2S) mesons are measured in lead-lead collisions at a center-of-mass energy per nucleon pair of $ \sqrt{s_{\textrm{NN}}} $ = 5.02 TeV. The analysis uses a data set corresponding to an integrated luminosity of 1.61 nb$^{−1}$ marc:recorded with the CMS detector. The J/ψ and ψ(2S) mesons are reconstructed using their dimuon decay channel. The v$_{2}$ and v$_{3}$ coefficients are extracted using the scalar product method and studied as functions of meson transverse momentum and collision centrality. The measured v$_{2}$ values for prompt J/ψ mesons are found to be larger than those for nonprompt J/ψ mesons. The prompt J/ψ v$_{2}$ values at high p$_{T}$ are found to be underpredicted by a model incorporating only parton energy loss effects in a quark-gluon plasma medium. Prompt and nonprompt J/ψ meson v$_{3}$ and prompt ψ(2S) v$_{2}$ and v$_{3}$ values are also reported for the first time, providing new information about heavy quark interactions in the hot and dense medium created in heavy ion collisions.[graphic not available: see fulltext]
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Benecke, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Jain, S., Lemaitre, V., Mondal, K., Taliercio, A., Tran, T. T., Vischia, P., Wertz, S., CMS, Bethani, A., & et al. (2023). Measurements of the azimuthal anisotropy of prompt and nonprompt charmonia in PbPb collisions at $ \sqrt{s_{\textrm{NN}}} $ = 5.02 TeV. Journal of High Energy Physics, 10. https://doi.org/10.1007/JHEP10(2023)115 (Original work published 2023)