Test of Lepton Universality in b→sℓ^{+}ℓ^{-} Decays

Aaij, R;Abdelmotteleb, A S W;Abellan Beteta, C;Abudinén, F;Ackernley, T;Adeva, B;Adinolfi, M;Adlarson, P;Afsharnia, H;Agapopoulou, C;Aidala, C A;Ajaltouni, Z;Akar, S;Akiba, K;Albicocco, P;Albrecht, J;Alessio, F;Alexander, M;Alfonso Albero, A;Aliouche, Z;Alvarez Cartelle, P;Amalric, R;Amato, S;Amey, J L;Amhis, Y;An, L;Anderlini, L;Andersson, M;Andreianov, A;Andreotti, M;Andreou, D;Ao, D;Archilli, F;Artamonov, A;Artuso, M;Aslanides, E;Atzeni, M;Audurier, B;Bachiller Perea, I;Bachmann, S;Bachmayer, M;Back, J J;Bailly-Reyre, A;Baladron Rodriguez, P;Balagura, V;Baldini, W;Baptista de Souza Leite, J;Barbetti, M;Barlow, R J;Barsuk, S;Barter, W;Bartolini, M;Baryshnikov, F;Basels, J M;Bassi, G;Batsukh, B;Battig, A;Bay, A;Beck, A;Becker, M;Bedeschi, F;Bediaga, I B;Beiter, A;Belin, S;Bellee, V;Belous, K;Belov, I;Belyaev, I;Benane, G;Bencivenni, G;Ben-Haim, E;Berezhnoy, A;Bernet, R;Bernet Andres, S;Berninghoff, D;Bernstein, H C;Bertella, C;Bertolin, A;Betancourt, C;Betti, F;Bezshyiko, Ia;Bhom, 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2023-01-01

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Abstract

The first simultaneous test of muon-electron universality using B^{+}→K^{+}ℓ^{+}ℓ^{-} and B^{0}→K^{*0}ℓ^{+}ℓ^{-} decays is performed, in two ranges of the dilepton invariant-mass squared, q^{2}. The analysis uses beauty mesons produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9  fb^{-1}. Each of the four lepton universality measurements reported is either the first in the given q^{2} interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.