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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
Science and Technology Facilities CouncilGRIDPP, ST/S000909/1

    UN SDGs

    This output contributes to the following UN Sustainable Development Goals (SDGs)

    1. SDG 7 - Affordable and Clean Energy
      SDG 7 Affordable and Clean Energy

    Keywords

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

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