## Abstract

In the Standard Model of particle physics, the strength of the couplings of the b quark to the u and c quarks, /V<inf>ub</inf>/ and /V<inf>cb</inf>/, are governed by the coupling of the quarks to the Higgs boson. Using data from the LHCb experiment at the Large Hadron Collider, the probability for the Λ<inf>b</inf>

^{0}baryon to decay into the pμ^{-}v<inf>μ</inf> final state relative to the Λ<inf>c</inf>^{+}μ^{-}v<inf>μ</inf> final state is measured. Combined with theoretical calculations of the strong interaction and a previously measured value of /V<inf>cb</inf>/, the first /V<inf>ub</inf>/ measurement to use a baryonic decay is performed. This measurement is consistent with previous determinations of /V<inf>ub</inf>/ using B meson decays to specific final states and confirms the existing incompatibility with those using an inclusive sample of final states.Original language | English |
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Pages (from-to) | 743-747 |

Journal | Nature Physics |

Volume | 11 |

DOIs | |

Publication status | Published - 2015 |