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| Title: | Observation of two excited Bc+ states and measurement of the Bc+ (2S) mass in pp collisions at √s = 13 TeV |
| Authors: | Sirunyan, A. M.; Cabrillo, I. J.  ; Calderon, Alicia ; Chazin Quero, B.; Duarte Campderros, J. ; Fernández, M. ; Fernández-Manteca, Pedro; García Alonso, A.; García-Ferrero, J. ; Gómez, G. ; Martínez-Rivero, Celso ; Martínez Ruiz del Arbol, P. ; Matorras, Francisco ; Piedra, Jonatan ; Prieels, C.; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Trevisani, N. ; Vila, Iván |
| Issue Date: | 2019 |
| Publisher: | American Physical Society |
| Citation: | Physical Review Letters 122: 132001 (2019) |
| Abstract: | Signals consistent with the Bc+(2S) and Bc∗+(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 Bc+π+π- invariant mass spectrum, with the ground state Bc+ 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 Bc+(2S) meson is measured to be 6871.0±1.2(stat)±0.8(syst)±0.8(Bc+) MeV, where the last term corresponds to the uncertainty in the world-average Bc+ mass. |
| Description: | CMS Collaboration: et al. |
| Publisher version (URL): | https://doi.org/10.1103/PhysRevLett.122.132001 |
| URI: | http://hdl.handle.net/10261/213499 |
| DOI: | http://dx.doi.org/10.1103/PhysRevLett.122.132001 |
| Identifiers: | doi: 10.1103/PhysRevLett.122.132001 e-issn: 1079-7114 issn: 0031-9007 |
| Appears in Collections: | (IFCA) Artículos |
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