Test of lepton universality with Lambda(0)(b) -> pK(-) l(+)l(-)

Aaij, R, Beteta, C Abellan, Ackernley, T, Adeva, B, Adinol, M, Afsharnia, H, Aidala, CA, Aiola, S, Ajaltouni, Z, Akar, S
et al (show 896 more authors) (2020) Test of lepton universality with Lambda(0)(b) -> pK(-) l(+)l(-). The Journal of High Energy Physics, 2020 (5). 40-.

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The ratio of branching fractions of the decays $\Lambda^{0}_{b}\to pK^{-}e^{+}e^{-}$ and $\Lambda^{0}_{b}\to pK^{-}\mu^{+}\mu^{-}$, $R^{-1}_{pK}$, 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 $0.1 < q^{2} < 6.0$ $GeV^{2}/c^{4}$ and the $pK^{-}$ mass range $m(pK^{-}) < 2600$ $MeV/c^{2}$, the ratio of branching fractions is measured to be $R^{-1}_{pK} = 1.17 ^{+0.18}_{-0.16} \pm 0.07$, 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 $\Lambda^{0}_{b}\to pK^{-}e^{+}e^{-}$.

Item Type: Article
Additional Information: All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-040.html (LHCb public pages)
Uncontrolled Keywords: B physics, Branching fraction, Flavour Changing Neutral Currents, Hadron, Hadron scattering (experiments), Rare decay
Depositing User: Symplectic Admin
Date Deposited: 21 Sep 2020 15:51
Last Modified: 18 Jan 2023 23:32
DOI: 10.1007/JHEP05(2020)040
Open Access URL: https://link.springer.com/content/pdf/10.1007/JHEP...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3102069

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