Observation of New Resonances in the Λb0 π+π- System

(LHCb Collaboration)

Результат исследований: Материалы для журналаСтатья

14 Цитирования (Scopus)

Аннотация

We report the observation of a new structure in the Λb0π+π- spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9 fb-1, collected at s=7, 8, and 13 TeV. A study of the structure suggests its interpretation as a superposition of two almost degenerate narrow states. The masses and widths of these states are measured to be mΛb(6146)0=6146.17±0.33±0.22±0.16 MeV,mΛb(6152)0=6152.51±0.26±0.22±0.16 MeV,ΓΛb(6146)0=2.9±1.3±0.3 MeV,ΓΛb(6152)0=2.1±0.8±0.3 MeV,with a mass splitting of Δm=6.34±0.32±0.02 MeV, where the first uncertainty is statistical, the second systematic. The third uncertainty for the mass measurements derives from the knowledge of the mass of the Λb0 baryon. The measured masses and widths of these new excited states suggest their possible interpretation as a doublet of Λb(1D)0 states.

Язык оригиналаАнглийский
Номер статьи152001
ЖурналPhysical Review Letters
Том123
Номер выпуска15
DOI
СостояниеОпубликовано - 11 окт 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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