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Yang (3)","submitted_at":"2016-10-17T16:10:51Z","abstract_excerpt":"The first observation of the rare decay$B^0_s \\to \\phi\\pi^+\\pi^-$ and evidence for $B^0 \\to \\phi\\pi^+\\pi^-$ are reported, using $pp$ collision data recorded by the LHCb detector at centre-of-mass energies $\\sqrt{s} = 7$ and 8~TeV, corresponding to an integrated luminosity of $3{\\mbox{\\,fb}^{-1}}$. The branching fractions in the $\\pi^+\\pi^-$ invariant mass range $400