Precise measurements of the properties of the $B_1(5721)^0,+$ and $B^\ast_2(5747)^0,+$ states and observation of $B^+,0π^-,+$ mass structuresстатья
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Дата последнего поиска статьи во внешних источниках: 18 марта 2016 г.
Аннотация:Invariant mass distributions of B+π− and B0π+ combinations are investigated in order to study excited B mesons. The analysis is based on a data sample corresponding to 3.0fb−1 of pp collision data, recorded by the LHCb detector at centre-of-mass energies of 7 and 8TeV. Precise measurements of the masses and widths of the B1(5721)0,+ and B∗2(5747)0,+ states are reported. Clear enhancements, particularly prominent at high pion transverse momentum, are seen over background in the mass range 5850--6000MeV in both B+π− and B0π+ combinations. The structures are consistent with the presence of four excited B mesons, labelled BJ(5840)0,+ and BJ(5960)0,+, whose masses and widths are obtained under different hypotheses for their quantum numbers.