Observation of the $B^{+}\to D^{\ast -}{K}^{+}{\pi }^{+}$ decay

Abstract

The $B^{+}\to D^{\ast -}{K}^{+}{\pi }^{+}$ decay potentially provides an excellent way to investigate charm meson spectroscopy. The decay is searched for in a sample of proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of $3{\mathrm{fb}}^{-1}$. A clear signal is observed, and the ratio of its branching fraction to that of the $B^{+}\to D^{\ast -}{\pi }^{+}{\pi }^{+}$ normalisation channel is measured to be \begin{equation*} \frac{\mathcal{B}(B^+ \to D^{*-}K^+π^+)}{\mathcal{B}(B^+ \to D^{*-}π^+π^+)} = \left( 6.39 \pm 0.27 \pm 0.48 \right) \times 10^{-2} \, , \end{equation*} where the first uncertainty is statistical and the second is systematic. This is the first observation of the $B^{+}\to D^{\ast -}{K}^{+}{\pi }^{+}$ decay.

arXiv comment9 pages + authorlist. Submitted to PRD. 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-2017-006.html

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• First observation and amplitude analysis of the $B^{-}\to D^{+}{K}^{-}{\pi }^{-}$ decay
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• Observation of the decay B0 -> D0bar K+ K- and evidence for Bs -> D0bar K+ K-
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