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Journal Articles Physical Review Letters Year : 2013

Observation of the decay B_c^+ \to B_s^0 \pi^+

R. Aaij
  • Function : Author
J. He
J. Cogan
O. Leroy
J. Serrano


The result of a search for the decay Bc+ -> Bs pi+ is presented, using the Bs -> Ds- pi+ and Bs -> J/psi Phi channels. The analysis is based on a data sample of pp collisions collected with the LHCb detector, corresponding to an integrated luminosity of 1 fb-1 taken at a center-of-mass energy of 7 TeV, and 2 fb-1 taken at 8 TeV. The decay Bc+ -> Bs pi+ is observed with significance in excess of five standard deviations independently in both decay channels. The measured product of the ratio of cross-sections and branching fraction is sigma(Bc)/sigma(Bs) x BR(Bc+ -> Bs pi+) = (2.37 \pm 0.31 (stat) \pm 0.11 (syst)^{+0.17}_{-0.13} (tau_Bc)) x 10^{-3} in the pseudorapidity range 2 < eta(B) < 5, where the first uncertainty is statistical, the second is systematic and the third is due to the uncertainty on the Bc lifetime. This is the first observation of a B meson decaying to another B meson via the weak interaction.

Dates and versions

in2p3-00853219 , version 1 (22-08-2013)



R. Aaij, Y. Amhis, S. Barsuk, O. Callot, J. He, et al.. Observation of the decay B_c^+ \to B_s^0 \pi^+. Physical Review Letters, 2013, 111, pp.181801. ⟨10.1103/PhysRevLett.111.181801⟩. ⟨in2p3-00853219⟩
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