Abstract : The first observation of the rare decayB0s→ϕπ+π− and evidence for B0→ϕπ+π− are reported, using pp collision data recorded by the LHCb detector at centre-of-mass energies s√=7 and 8~TeV, corresponding to an integrated luminosity of 3\,fb−1. The branching fractions in the π+π− invariant mass range 400
R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Observation of the decay B0s→φπ+π− and evidence for B0→φπ+π−. Physical Review D, American Physical Society, 2017, 95, pp.012006. ⟨10.1103/PhysRevD.95.012006⟩. ⟨in2p3-01383421⟩
