2024-03-29T23:28:06Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2134992020-12-10T11:47:57Zcom_10261_37com_10261_4col_10261_290
http://hdl.handle.net/10261/213499
10.1103/PhysRevLett.122.132001
394242
Observation of two excited Bc+ states and measurement of the Bc+ (2S) mass in pp collisions at √s = 13 TeV
American Physical Society
2019
artículo
Sirunyan, A. M.
Cabrillo, I. J.
rp01781
Calderon, Alicia
rp06741
Chazin Quero, B.
Duarte Campderros, J.
rp06803
Fernández, M.
rp06805
Fernández Manteca, P. J.
García Alonso, A.
García-Ferrero, J.
rp06807
Gómez, G.
rp06809
Martínez-Rivero, Celso
rp06812
Martínez Ruiz del Arbol, P.
Matorras, Francisco
rp06828
Piedra, Jonatan
rp06829
Prieels, C.
Rodrigo, Teresa
rp06830
Ruiz Jimeno, Alberto
rp06831
Scodellaro, Luca
rp06832
Trevisani, N.
rp06833
Vila, Iván
2019
CMS Collaboration: et al.
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.
Physical Review Letters
2019
122
132001