Determination of the quark coupling strength /Vub/ using baryonic decays

The Lhcb Collaboration

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Abstract

In the Standard Model of particle physics, the strength of the couplings of the b quark to the u and c quarks, /Vub/ and /Vcb/, 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 Λb 0 baryon to decay into the pμ-vμ final state relative to the Λc +μ-vμ final state is measured. Combined with theoretical calculations of the strong interaction and a previously measured value of /Vcb/, the first /Vub/ measurement to use a baryonic decay is performed. This measurement is consistent with previous determinations of /Vub/ using B meson decays to specific final states and confirms the existing incompatibility with those using an inclusive sample of final states.

Original languageEnglish (US)
Pages (from-to)743-747
Number of pages5
JournalNature Physics
Volume11
Issue number9
DOIs
StatePublished - Sep 4 2015

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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