%0 Journal Article
%T Test of lepton universality with Lambda(0)(b) -> pK(-) l(+)l(-)
%A LHCb Collaboration (Aaij, R. et al
%A Garcia Martin, L. M.
%A Henry, L.
%A Jashal, B. K.
%A Martinez-Vidal, F.
%A Oyanguren, A.
%A Remon Alepuz, C.
%A Ruiz Vidal, J.
%A Sanchez Mayordomo, C.
%J Journal of High Energy Physics
%D 2020
%V 05
%N 5
%I Springer
%@ 1029-8479
%G English
%F LHCbCollaborationAaij_etal2020
%O WOS:000534629900001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4415), last updated on Sat, 13 Jun 2020 11:26:53 +0000
%X The ratio of branching fractions of the decays -> pK(-)mu(+)mu(-),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 < q(2)< 6.0 GeV2/c(4) and the pK(-) mass range m(pK(-)) < 2600 MeV/c(2), the ratio of branching fractions is measured to be RpK-1=1.17-0.16+0.18 +/- 0.0$$ {R}_{pK}<^>{-1}={1.17}_{-0.16}<^>{+0.18}\pm 0.07 $$\end{document}, 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 -> pK(-)e(+)e(-).
%K B physics
%K Branching fraction
%K Flavour Changing Neutral Currents
%K Hadron
%K Hadron scattering (experiments)
%K Rare decay
%R 10.1007/JHEP05(2020)040
%U https://arxiv.org/abs/1912.08139
%U https://doi.org/10.1007/JHEP05(2020)040
%P 40 - 27pp