Observation of a J/ψ Lambda Resonance Consistent with a Strange Pentaquark Candidate in B-→J/ψLambdap¯ Decays

Авторы: Бережной А.В., Горелов И.В., Данилина А.В., Козачук А.Д., Лефлат А.К., Никитин Н.В., Саврина Д.В., Соломин А.Н., Волков В.Ю., Жуков В.Ю., Королев М.Г., LHCb Collaboration
Журнал: Physical Review Letters
Том: 131
Номер: 3
Год издания: 2023
Издательство: American Physical Society
Местоположение издательства: United States
Первая страница: 031901
DOI: 10.1103/PhysRevLett.131.031901
Аннотация: An amplitude analysis of B−→J/ψΛp¯ decays is performed using about 4400 signal candidates selected on a data sample of pp collisions recorded at center-of-mass energies of 7, 8 and 13 TeV with the LHCb detector, corresponding to an integrated luminosity of 9 fb−1. A narrow resonance in the J/ψΛ system, consistent with a pentaquark candidate with strangeness, is observed with high significance. The mass and the width of this new state are measured to be 4338.2±0.7±0.4MeV and 7.0±1.2±1.3MeV, where the first uncertainty is statistical and the second systematic. The spin is determined to be 1/2 and negative parity is preferred. Due to the small Q-value of the reaction, the most precise single measurement of the B− mass to date, 5279.44±0.05±0.07MeV, is obtained.
Добавил в систему: Бережной Александр Викторович

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