Addendum: Test of lepton universality in beauty-quark decays
R. Aaij, C. Abellán Beteta, T. Ackernley, B. Adeva, M. Adinolfi, H. Afsharnia, C. A. Aidala, Simone Aiola, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, A. Alfonso Albero, Z. Aliouche, G. Alkhazov, P. Álvarez Cartelle, S. Amato, Y. Amhis, L. An, L. Anderlini, A. Andreianov, M. Andreotti, F. Archilli, A. Artamonov, M. Artuso, K. Arzymatov, E. Aslanides, M. Atzeni, B. Audurier, S. Bachmann, Marie Bachmayer, J. J. Back, P. Baladrón Rodríguez, V. Balagura, W. Baldini, J. Baptista de Souza Leite, R. J. Barlow, S. Barsuk, W. Barter, M. Bartolini, F. Baryshnikov, J. M. Basels, G. Bassi, B. Batsukh, A. Battig, A. Bay, M. Becker, F. Bedeschi, I. Bediaga, A. Beiter, V. Belavin, S. Belin, V. Bellée, K. Belous, I. Belov, I. Belyaev, G. Bencivenni, E. Ben-Haim, A. Berezhnoy, R. Bernet, D. Berninghoff, H. C. Bernstein, C. Bertella, A. Bertolin, C. Betancourt, F. Betti, Ia. Bezshyiko, S. Bhasin, J. Bhom, L. Bian, M. S. Bieker, S. Bifani, P. Billoir, M. Birch, F. C. R. Bishop, A. Bitadze, A. Bizzeti, M. Bjørn, M. P. Blago, T. Blake, F. Blanc, S. Blusk, D. Bobulska, J. A. Boelhauve, O. Boente García, T. Boettcher, A. Boldyrev, A. Bondar, N. Bondar, S. Borghi, M. Borisyak, M. Borsato, J. T. Borsuk, S. A. Bouchiba, T. J. V. Bowcock, A. Boyer, C. Bozzi, Matthew John Bradley, S. Braun
Abstract
In a new analysis since the publication of the original article, the LHCb collaboration performs a simultaneous test of muon-electron universality using \({B}^{+}\to {K}^{+}{{\mathscr{l}}}^{-}{{\mathscr{l}}}^{+}\) and \({B}^{0}\to {K}^{* 0}{{\mathscr{l}}}^{-}{{\mathscr{l}}}^{+}\) ( \({\mathscr{l}}=e,\mu\) ) decays with data collected between 2011 and 2018, corresponding to an integrated luminosity of 9 fb −1 (ref. 1 ). Further details are provided in ref. 2 . The decay-rate ratios of muon to electron modes, \({R}_{K}\) and \({R}_{{K}^{* }}\) , are measured in two \({q}^{2}\) regions, \(0.1 < {q}^{2} < 1.1\,{\rm{G}}e{V}^{2}/{c}^{4}\) (low- \({q}^{2}\) ) and \(1.1 < {q}^{2} < 6.0\,{\rm{G}}e{V}^{2}/{c}^{4}\) (central- \({q}^{2}\) ).