Study of the rare B0s and B0 decays into the π+π−μ+μ− final state

Abstract : A search for the rare decays B0s→π+π−μ+μ− and B0→π+π−μ+μ− is performed in a data set corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb detector in proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. Decay candidates with pion pairs that have invariant mass in the range 0.5-1.3 GeV/c2 and with muon pairs that do not originate from a resonance are considered. The first observation of the decay B0s→π+π−μ+μ− and the first evidence of the decay B0→π+π−μ+μ− are obtained and the branching fractions are measured to be B(B0s→π+π−μ+μ−)=(8.6±1.5(stat)±0.7(syst)±0.7(norm))×10−8 and B(B0→π+π−μ+μ−)=(2.11±0.51(stat)±0.15(syst)±0.16(norm))×10−8, where the third uncertainty is due to the branching fraction of the decay B0→J/ψ(→μ+μ−)K∗(890)0(→K+π−), used as a normalisation.
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R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Study of the rare B0s and B0 decays into the π+π−μ+μ− final state. Physics Letters B, Elsevier, 2015, 743, pp.46-55. ⟨10.1016/j.physletb.2015.02.010⟩. ⟨in2p3-01098253⟩

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