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

Abstract : 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.
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http://hal.in2p3.fr/in2p3-00853219
Contributor : Sabine Starita <>
Submitted on : Thursday, August 22, 2013 - 10:57:37 AM
Last modification on : Friday, November 20, 2020 - 3:30:14 PM

### Citation

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, American Physical Society, 2013, 111, pp.181801. ⟨10.1103/PhysRevLett.111.181801⟩. ⟨in2p3-00853219⟩

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