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

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The ratio of branching fractions of the decays Λ0b → pK−e+e− and Λ0b → pK−μ+μ−, R−1pK, 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 R−1pK=1.17+0.18−0.16±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 Λ0b → pK−e+e−.

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Journal of High Energy Physics, 2020, num. 40

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cc-by (c) LHCb Collaboration et al., 2020

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Articles publicats en revistes (Física Quàntica i Astrofísica)

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Large Hadron Collider (France and Switzerland)

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