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

Abstract : In the Standard Model of particle physics, the strength of the coupling of the b quark to the u quark, |Vub|, is governed by the coupling of the quarks to the Higgs boson. Using data from the LHCb experiment at the Large Hadron Collider, it is shown that |Vub|=(3.27±0.23)×10−3, from a measurement of Λ0b→pμ−ν¯μ decays. This 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. This measurement is the first ever to use a baryonic decay.
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Contributor : Sabine Starita <>
Submitted on : Wednesday, April 8, 2015 - 12:04:22 PM
Last modification on : Wednesday, September 16, 2020 - 4:28:24 PM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Determination of the quark coupling strength |Vub| using baryonic decays. Nature Physics, Nature Publishing Group, 2015, 10, pp.1038. ⟨10.1038/nphys3415⟩. ⟨in2p3-01140296⟩



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