Search for the rare decay ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$

Abstract

A search for the flavor-changing neutral-current decay ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ is reported using a data set corresponding to an integrated luminosity of $3.0\mathrm{f}{\mathrm{b}}^{-1}$ collected by the LHCb collaboration. No significant signal is observed outside of the dimuon mass regions around the $\varphi$ and $\omega$ resonances and an upper limit is placed on the branching fraction of $\mathcal{B}({\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-})<7.7(9.6)\times 10^{-8}\mathrm{at}90\%(95\%)$ confidence level. A significant signal is observed in the $\omega$ dimuon mass region for the first time.

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-2017-039.html

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