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

The Lhcb Collaboration

Research output: Contribution to journalArticle

62 Citations (Scopus)

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 Λb0 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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quarks
decay
incompatibility
Higgs bosons
baryons
mesons
physics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Determination of the quark coupling strength /Vub/ using baryonic decays. / The Lhcb Collaboration.

In: Nature Physics, Vol. 11, No. 9, 04.09.2015, p. 743-747.

Research output: Contribution to journalArticle

The Lhcb Collaboration. / Determination of the quark coupling strength /Vub/ using baryonic decays. In: Nature Physics. 2015 ; Vol. 11, No. 9. pp. 743-747.
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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 Λb0 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.",
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AB - 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 Λb0 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.

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