CMS-PAS-HIN-24-001 | ||
Observation of the multiplicity dependence of σψ(2S)/σJ/ψ in pPb collisions at 8.16 TeV | ||
CMS Collaboration | ||
12 June 2024 | ||
Abstract: The ratio of ψ(2S) and J/ψ meson production cross sections is measured as a function of the charged-particle multiplicity in pPb collisions at center-of-mass energy per nucleon pair of √sNN= 8.16 TeV using the CMS detector. The data corresponds to an integrated luminosity of 175 nb−1. Both charmonium states are measured using the dimuon decay channel. The ratio is measured for both prompt and nonprompt ψ(2S) and J/ψ mesons separately. A multiplicity-dependent modification of the ratio is observed for prompt mesons. The ratio of the nonprompt ψ(2S) to J/ψ cross sections show no dependency on multiplicity. No significant rapidity-dependence is observed within the charmonium rapidity range −2.865 <yCM< 1.935 and transverse momentum range probed, 3 <pT< 30 GeV. These measurements constrain hadronization models of heavy quarks in nuclear collisions and support a picture in which co-moving particles may preferentially dissociate weakly-bound charmonia excited states as compared to the ground state during the evolution of the system. | ||
Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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