Observation of Two Excited B+c States and Measurement of the B+c(2S) Mass in pp Collisions at √s=13 TeV; Physical Review Letters; Vol. 122, iss. 13
| Parent link: | Physical Review Letters Vol. 122, iss. 13.— 2019.— [132001, 17 p.] |
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| Andre forfattere: | , , , , , , , |
| Summary: | Title screen 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. Режим доступа: по договору с организацией-держателем ресурса |
| Sprog: | engelsk |
| Udgivet: |
2019
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| Online adgang: | https://doi.org/10.1103/PhysRevLett.122.132001 |
| Format: | Electronisk Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663685 |