Search for the rare decay of charmed baryon ${\Lambda }_c^{+}$ into $p{\mu }^{+}{\mu }^{-}$ final state

Abstract

A search for the nonresonant ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decay is performed using proton-proton collision data recorded at a centre-of-mass energy of 13 TeV by the LHCb experiment, corresponding to an integrated luminosity of 5.4 fb${}^{-1}$. No evidence for the decay is found in the dimuon invariant-mass regions where the expected contributions of resonances is subdominant. The upper limit on the branching fraction of the ${\Lambda }_c^{+}\to p{\mu }^{+}{\mu }^{-}$ decay is determined to be $2.9(3.2)\times 10^{-8}$ at 90% (95%) confidence level. The branching fractions in the dimuon invariant-mass regions dominated by the $\eta$, $\rho$ and $\omega$ resonances are also determined.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2024-005.html (LHCb public pages)

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• Rare ${\Lambda }_c$ decays and new physics effects
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