Observation of an Excited Bc+ State

Observation of an Excited Bc+ State

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Parent link:Physical Review Letters
Vol. 122, iss. 23.— 2019.— [232001, 10 p.]
Korporace: 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
Další autoři: Aaij R. Roel, Beteta C. A. Carlos Abellan, Adeva B. Bernardo, Eydelman S. I. Semen Isaakovich, Kharisova A. E. Anastasiya Evgenjevna, Panshin G. L. Gennady Leonidovich, Strokov S. A. Sergey Aleksandrovich
Shrnutí: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.
Jazyk:angličtina
Vydáno: 2019
Témata:
электронный ресурс
труды учёных ТПУ
On-line přístup:http://earchive.tpu.ru/handle/11683/64784
https://doi.org/10.1103/PhysRevLett.122.232001
Médium: Elektronický zdroj Kapitola
KOHA link:https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=663353
Popis
Shrnutí: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.122.232001

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