Observation of new resonances in the Λ0bπ+π− systemстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 20 ноября 2020 г.
Аннотация:We report the observation of a new structure in the Λ0bπ+π− spectrum using the full LHCb data set of pp collisions, corresponding to an integrated luminosity of 9fb−1, collected at s√=7, 8 and 13TeV. 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±0.16MeV,mΛb(6152)0=6152.51±0.26±0.22±0.16MeV,ΓΛb(6146)0=2.9±1.3±0.3MeV,ΓΛb(6152)0=2.1±0.8±0.3MeV,
with a mass splitting of Δm=6.34±0.32±0.02MeV, where the first uncertainty is statistical, the second systematic and the third derives from the knowledge of the mass of the Λ0b baryon. The measured masses and widths of these new excited states suggest their possible interpretation as a doublet of Λb(1D)0 states.