Observation of the b1(3P) and b2(3P) and measurement of their masses
Abstract
The b1(3P) and b2(3P) states are observed through their (3S) γ decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb-1. The (3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e+e- pairs in the silicon tracker, leading to a b(3P) mass resolution of 2.2 MeV. This is the first time that the J = 1 and 2 states are well resolved and their masses individually measured: 10\,513.42 0.41 (stat) 0.18 (syst) MeV and 10\,524.02 0.57 (stat) 0.18 (syst) MeV; they are determined with respect to the world-average value of the (3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60 0.64 (stat) 0.17 (syst) MeV.
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