Details

Autor(en) / Beteiligte

• Lees, J P

Titel

Measurements of the Absolute Branching Fractions of B±→K±Xcc

Ist Teil von

• Physical review letters, 2020-04, Vol.124 (15)

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2020

Quelle

PROLA

Beschreibungen/Notizen

• A study of the two-body decays B±→Xcc¯K±, where Xcc¯ refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of 424 fb−1. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay B+→X(3872)K+ at the 3σ level. The absolute branching fraction B[B+→X(3872)K+]=[2.1±0.6(stat)±0.3(syst)]×10−4 is measured for the first time. It follows that B[X(3872)→J/ψπ+π−]=(4.1±1.3)%, supporting the hypothesis of a molecular component for this resonance.