Observation of $B^{+}\to J/\psi 3{\pi }^{+}2{\pi }^{-}$ and $B^{+}\to \psi (2S){\pi }^{+}{\pi }^{+}{\pi }^{-}$ decays

Abstract

The decays $B^{+}\to J/\psi 3{\pi }^{+}2{\pi }^{-}$ and $B^{+}\to \psi (2S){\pi }^{+}{\pi }^{+}{\pi }^{-}$ are observed for the first time using a data sample corresponding to an integrated luminosity of $3.0f{b}^{-1}$, collected by the LHCb experiment in proton-proton collisions at the centre-of-mass energies of 7 and 8 TeV. The branching fractions relative to that of $B^{+}\to \psi (2S)K^{+}$ are measured to be \begin{eqnarray*} \frac {\mathcal{B}\left(B^+\rightarrow J/ψ3π^+ 2π^- \right)} {\mathcal{B}\left(B^+ \rightarrow ψ(2S)K^+ \right)} & = & \left(1.88\pm0.17\pm0.09\right)\times10^{-2}, \frac {\mathcal{B}\left(B^+\rightarrow ψ(2S) π^+π^+π^- \right)} {\mathcal{B}\left(B^+ \rightarrow ψ(2S)K^+ \right)} & = & \left(3.04\pm0.50\pm0.26\right)\times10^{-2}, \end{eqnarray*} where the first uncertainties are statistical and the second are systematic.

arXiv comment20 pages, 5 figures, All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2016-040.html

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