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

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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) , Albicocco, P, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Alkhazov, G, Cartelle, P Alvarez, Alves Jr, AA, Amato, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Archilli, F, Romeu, J Arnau, Artamonov, A, Artuso, M, Arzymatov, K, Aslanides, E, Atzeni, M, Audurier, B, Bachmann, S, Back, JJ, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barsuk, S, Barter, W, Bartolini, M, Baryshnikov, F, Bassi, G, Batozskaya, V, Batsukh, B, Battig, A, Bay, A, Becker, M, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Belavin, V, Belin, S, Beliy, N, Bellee, V, Belous, K, Belyaev, I, Bencivenni, G, Ben-Haim, E, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berningho, D, Bernstein, HC, Bertella, C, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, Bezshyiko, Ia, Bhasin, S, Bhom, J, Bieker, MS, Bifani, S, 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Wark, HM ORCID: 0000-0002-5177-9136, Watson, NK, Websdale, D, Weiden, A, Weisser, C, Westhenry, BDC, White, DJ, Whitehead, M, Wiedner, D, Wilkinson, G, Wilkinson, M, Williams, I, Williams, M, Williams, MRJ, Williams, T, Wilson, FF, Wislicki, W, Witek, M, Witola, L, Wormser, G, Wotton, SA, Wu, H, Wyllie, K, Xiang, Z, Xiao, D, Xie, Y, Xing, H, Xu, A, Xu, L, Xu, M, Xu, Q, Xu, Z, Yang, Z, Yao, Y, Yeomans, LE, Yin, H, Yu, J, Yuan, X, Yushchenko, O, Zarebski, KA, Zavertyaev, M, Zdybal, M, Zeng, M, Zhang, D, Zhang, L, Zhang, S, Zhang, WC, Zhang, Y, Zhelezov, A, Zheng, Y, Zhou, X, Zhou, Y, Zhu, X, Zhukov, V, Zonneveld, JB and Zucchelli, S (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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Abstract

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...
Related URLs:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3102069

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• Test of lepton universality with $$ {\Lambda}_b^0\to {pK}^{-}{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ decays. (deposited 02 Jun 2020 10:25)
  • Test of lepton universality with Lambda(0)(b) -> pK(-) l(+)l(-). (deposited 21 Sep 2020 15:51) [Currently Displayed]