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

The LHCb collaboration

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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.

Idioma originalAnglès
Pàgines (de-a)743-747
Nombre de pàgines5
RevistaNature Physics
Estat de la publicacióPublicada - 4 de set. 2015


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