Low- pT e+e− Pair Production in Au+Au Collisions at sNN=200 GeV and U+U Collisions at sNN=193 GeV at STAR
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The first observation of the decay and measurement of the branching ratio of to are presented. The and mesons are reconstructed using their dimuon decay modes. The results are based on proton-proton colliding beam data from the LHC collected by the CMS experiment at in 2016–2018, corresponding to an integrated luminosity of . The branching fraction ratio is measured to be , where the last uncertainty comes from the uncertainties in the branching fractions of the charmonium states. New measurements of the baryon mass and natural width are also presented, using the final state, where the baryon is reconstructed through the decays , , , and . Finally, the fraction of baryons produced from decays is determined. © 2024 CERN, for the CMS Collaboration2024CERNmore » « less