Determination of the quark coupling strength $|V_ub|$ using baryonic decays

R. Aaij, G. Raven

Research output: Contribution to JournalArticleAcademicpeer-review


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 languageEnglish
Pages (from-to)743-747
JournalNature Physics
Publication statusPublished - 2015

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