Study of $B_c^{+}$ decays to the $K^{+}{K}^{-}\ddot{I}{€}^{+}$ final state and evidence for the decay $B_c^{+}\to \ddot{I}{‡}_{c0}\ddot{I}{€}^{+}$

Abstract

A study of $B_c^{+}\to K^{+}{K}^{-}\ddot{I}{€}^{+}$ decays is performed for the first time using data corresponding to an integrated luminosity of 3.0 ${\mathrm{fb}}^{-1}$ collected by the LHCb experiment in $pp$ collisions at centre-of-mass energies of $7$ and $8$ TeV. Evidence for the decay $B_c^{+}\to \ddot{I}{‡}_{c0}(\to K^{+}{K}^{-})\ddot{I}{€}^{+}$ is reported with a significance of 4.0 standard deviations, resulting in the measurement of $\frac{\ddot{I}ƒ(B_c^{+})}{\ddot{I}ƒ(B^{+})}\times \mathcal{B}(B_c^{+}\to \ddot{I}{‡}_{c0}\ddot{I}{€}^{+})$ to be $(9.8_{-3.0}^{+3.4}(\mathrm{stat})\pm 0.8(\mathrm{syst}))\times 10^{-6}$. Here $\mathcal{B}$ denotes a branching fraction while $\ddot{I}ƒ(B_c^{+})$ and $\ddot{I}ƒ(B^{+})$ are the production cross-sections for $B_c^{+}$ and $B^{+}$ mesons. An indication of $\bar{b}c$ weak annihilation is found for the region $m(K^{-}\ddot{I}{€}^{+})<1.834\mathrm{Ge}\mathrm{V}/c^2$, with a significance of 2.4 standard deviations.

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-2016-022.html, link to supplemental material inserted in the references