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  • Test of lepton universality with $\Lambda^{0}_{b} \to p K^- \ell^+ \ell^-$ decays
    Aslanides, E; Barsuk, S; Bediaga, I; Betancourt, C; Blago, M. P; Charpentier, Ph; Chatzikonstantinidis, G; Chernov, A; Cogneras, E; Currie, R; Del Buono, L; Dembinski, H. -P; Dziewiecki, M; Fiorini, M; Frank, M; Gan, Y; Gandelman, M; Martin, L. M. Garcia; Garrido, L; Gascon, D; Gaspar, C; Gersabeck, E; Graugés, E; Grillo, L; Gu, C; Gushchin, E; Haines, S. C; Harnew, N; He, J; Hecker, M; Heijhoff, K; Hicheur, A; Hopchev, P. H; Hu, J; Hutchcroft, D; Inyakin, A; Jevtic, V; Keizer, F; Ketel, T; Kucewicz, W; Kucharczyk, M; Kvaratskheliya, T; Latham, T; Lefèvre, R; Loh, D; Longstaff, I; Maccolini, S; Macko, V; Malygina, H; Escalero, R. Manera; Santos, D. Martinez; Mathe, Z; Mauri, A; McNab, A; Meinert, N; Melnychuk, D; Mu, H; Nandakumar, R; Oldeman, R; Palano, A; Panshin, G; Parker, W; Petridis, K; Petruzzo, M; Piucci, A; Pomery, G. J; Prouve, C; Pugatch, V; Rachwal, B; Raven, G; Robert, A; Vidal, A. Romero; Rudolph, M. S; Santovetti, E; Smead, L. G. Scantlebury; Schulte, S; Sellam, S; Semennikov, A; Seuthe, A; Shevchenko, V; Siddi, B. G; Soler, F. J. P; De Paula, B. Souza; Spaan, B; Norella, E. Spadaro; Szabelski, A; Tolk, S; Tuci, G; Vagner, A; van Beuzekom, M; Wang, J; Ward, D. R; Websdale, D; Wiedner, D; Wilson, F. F; Witola, L; Zhang, D; Zhang, W. C; Zheng, Y; Zhou, Y

    12/2019
    Journal Article

    J. High Energ. Phys. 2020, 40 (2020) 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 $\Lambda^{0}_{b}\to pK^{-}e^{+}e^{-}$.

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