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Article Dans Une Revue Physical Review Letters Année : 2017

Observation of the annihilation decay mode B0→K+K−

R. Aaij
  • Fonction : Auteur
R. Lefevre
  • Fonction : Auteur
O. Leroy
J. Serrano

Résumé

A search for the B0→K+K− decay is performed using pp-collision data collected by LHCb. The data set corresponds to integrated luminosities of 1 and 2 fb−1 at center-of-mass energies of 7 and 8 TeV, respectively. This decay is observed for the first time, with a significance of more than five standard deviations. The analysis also results in an improved measurement of the branching fraction for the B0s→π+π− decay. The measured branching fractions are BR(B0→K+K−)=(7.80±1.27±0.81±0.21)×10−8 and BR(B0s→π+π−)=(6.91±0.54±0.63±0.19±0.40)×10−7. The first uncertainty is statistical, the second is systematic, the third is due to the uncertainty on the B0→K+π− branching fraction used as a normalization. For the B0s mode, the fourth accounts for the uncertainty on the ratio of the probabilities for b quarks to hadronize into B0s and B0 mesons.

Dates et versions

in2p3-01388560 , version 1 (27-10-2016)

Identifiants

Citer

R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Observation of the annihilation decay mode B0→K+K−. Physical Review Letters, 2017, 118, pp.081801. ⟨10.1103/PhysRevLett.118.081801⟩. ⟨in2p3-01388560⟩
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