Observation of the decay $B_s^0\to \varphi {\pi }^{+}{\pi }^{-}$ and evidence for $B^0\to \varphi {\pi }^{+}{\pi }^{-}$

Abstract

The first observation of the rare decay$B_s^0\to \varphi {\pi }^{+}{\pi }^{-}$ and evidence for $B^0\to \varphi {\pi }^{+}{\pi }^{-}$ 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 $400<m({\pi }^{+}{\pi }^{-})<1600\mathrm{Me}\mathrm{V}/c^2$ are $[3.48\pm 0.23\pm 0.17\pm 0.35]\times 10^{-6}$ and $[1.82\pm 0.25\pm 0.41\pm 0.14]\times 10^{-7}$ for $B_s^0\to \varphi {\pi }^{+}{\pi }^{-}$ and $B^0\to \varphi {\pi }^{+}{\pi }^{-}$ respectively, where the uncertainties are statistical, systematic and from the normalisation mode $B_s^0\to \varphi \varphi$. A combined analysis of the ${\pi }^{+}{\pi }^{-}$ mass spectrum and the decay angles of the final-state particles identifies the exclusive decays $B_s^0\to \varphi f_0(980)$, $B_s^0\to \varphi f_2(1270)$, and $B_s^0\to \varphi {\rho }^0$ with branching fractions of $[1.12\pm 0.16_{-0.08}^{+0.09}\pm 0.11]\times 10^{-6}$, $[0.61\pm 0.13_{-0.05}^{+0.12}\pm 0.06]\times 10^{-6}$ and $[2.7\pm 0.7\pm 0.2\pm 0.2]\times 10^{-7}$, respectively.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-028.html

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