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In the Standard Model of particle physics, the strength of the couplings ofthe $b$ quark to the $u$ and $c$ quarks, $|V_{ub}|$ and $|V_{cb}|$, aregoverned by the coupling of the quarks to the Higgs boson. Using data from theLHCb experiment at the Large Hadron Collider, the probability for the$\Lambda^0_b$ baryon to decay into the $p \mu^- \overline{\nu}_\mu$ final staterelative to the $\Lambda^+_c \mu^- \overline{\nu}_\mu$ final state is measured.Combined with theoretical calculations of the strong interaction and apreviously measured value of $|V_{cb}|$, the first $|V_{ub}|$ measurement touse a baryonic decay is performed. This measurement is consistent with previousdeterminations of $|V_{ub}|$ using $B$ meson decays to specific final statesand confirms the existing incompatibility with those using an inclusive sampleof final states.

Determination of the quark coupling strength $|V_{ub}|$ using baryonic decays