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Observation of Two Excited B+c States and Measurement of the B+c (2S) Mass in pp Collisions at √s = 13 TeV
Sirunyan, A. M. Sanders, Stephen J. CMS Collaboration
Sirunyan, A. M.
Sanders, Stephen J.
CMS Collaboration
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Abstract
Signals consistent with the B+c(2S) and B*+c(2S) states are observed in proton-proton collisions at √s=13 TeV, in an event sample corresponding to an integrated luminosity of 143 fb−1, collected by the CMS experiment during the 2015–2018 LHC running periods. These excited ¯bc states are observed in the B+cπ+π− invariant mass spectrum, with the ground state B+c reconstructed through its decay to J/ψπ+. The two states are reconstructed as two well-resolved peaks, separated in mass by 29.1 ± 1.5 (stat) ± 0.7 (syst ) MeV. The observation of two peaks, rather than one, is established with a significance exceeding five standard deviations. The mass of the B+c(2S) meson is measured to be 6871.0 ±1.2 (stat) ± 0.8 (syst) ± 0.8 (B+c) MeV, where the last term corresponds to the uncertainty in the world-average B+c mass.
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This work is licensed under a Creative Commons Attribution 4.0 International License.
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2019-04-02
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American Physical Society
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A. M. Sirunyan et al., "Observation of Two Excited B+c States and Measurement of the B+c (2S) Mass in pp Collisions at √s = 13 TeV", Phys. Rev. Lett. 122, 132001, 2 April 2019, American Physical Society, https://doi.org/10.1103/PhysRevLett.122.132001