Test of lepton universality with Λb0→pK− ℓ+ ℓ− decays

The Lhcb Collaboration

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

The ratio of branching fractions of the decays Λb0 → pKe+e and Λb0 → pKμ+μ,RpK−1, is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb−1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q2< 6.0 GeV2/c4 and the pK mass range m(pK) < 2600 MeV/c2, the ratio of branching fractions is measured to be RpK−1=1.17−0.16+0.18±0.07, where the first uncertainty is statistical and the second systematic. This is the first test of lepton universality with b baryons and the first observation of the decay Λb0 → pKe+e. [Figure not available: see fulltext.].

Original languageEnglish
Article number40
Pages (from-to)1-26
Number of pages2
JournalJournal of High Energy Physics
Volume2020
Issue number5
DOIs
Publication statusPublished - 11 May 2020

Funding

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited

FundersFunder number
Creative Commons Attribution License
Horizon 2020 Framework Programme792684, 714536

    Keywords

    • B physics
    • Branching fraction
    • Flavour Changing Neutral Currents
    • Hadron- Hadron scattering (experiments)
    • Rare decay

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