Observation of New Resonances in the Λ0bπ+π− System; Physical Review Letters; Vol. 123, iss. 15

Observation of New Resonances in the Λ0bπ+π− System; Physical Review Letters; Vol. 123, iss. 15

Detalhes bibliográficos
Parent link:Physical Review Letters
Vol. 123, iss. 15.— 2019.— [152001, 11 p.]
Corporate Authors: Национальный исследовательский Томский политехнический университет Инженерная школа информационных технологий и робототехники Отделение автоматизации и робототехники (ОАР), Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Outros Autores: Aaij R. Roel, Beteta C. A. Carlos Abellan, Ackernley T., Eydelman S. I. Semen Isaakovich, Kharisova A. E. Anastasiya Evgenjevna, Panshin G. L. Gennady Leonidovich, Strokov S. A. Sergey Aleksandrovich
Resumo:Title screen
Using pp collision data corresponding to an integrated luminosity of 8.5  fb−1 recorded by the LHCb experiment at center-of-mass energies of √s=7, 8, and 13 TeV, the observation of an excited B+c state in the B+cπ+π− invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(B+c)  MeV/c2, where the last uncertainty is due to the limited knowledge of the B+c mass. It is consistent with expectations of the B∗c(23S1)+ state reconstructed without the low-energy photon from the B∗c(13S1)+→B+cγ decay following B∗c(23S1)+→B∗c(13S1)+π+π−. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(B+c)  MeV/c2, and is consistent with the Bc(21S0)+ state. These mass measurements are the most precise to date.
Idioma:inglês
Publicado em: 2019
Assuntos:
электронный ресурс
труды учёных ТПУ
Acesso em linha:https://doi.org/10.1103/PhysRevLett.123.152001
Formato: Recurso Electrónico Capítulo de Livro
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663418
Descrição
Resumo:Title screen
Using pp collision data corresponding to an integrated luminosity of 8.5  fb−1 recorded by the LHCb experiment at center-of-mass energies of √s=7, 8, and 13 TeV, the observation of an excited B+c state in the B+cπ+π− invariant-mass spectrum is reported. The observed peak has a mass of 6841.2±0.6(stat)±0.1(syst)±0.8(B+c)  MeV/c2, where the last uncertainty is due to the limited knowledge of the B+c mass. It is consistent with expectations of the B∗c(23S1)+ state reconstructed without the low-energy photon from the B∗c(13S1)+→B+cγ decay following B∗c(23S1)+→B∗c(13S1)+π+π−. A second state is seen with a global (local) statistical significance of 2.2σ (3.2σ) and a mass of 6872.1±1.3(stat)±0.1(syst)±0.8(B+c)  MeV/c2, and is consistent with the Bc(21S0)+ state. These mass measurements are the most precise to date.
DOI:10.1103/PhysRevLett.123.152001

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