Measurement of the Λb0 → Λ(1520) μ+ μ− Differential Branching Fraction

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; 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doi:10.1103/PhysRevLett.131.151801

The branching fraction of the rare decay Λb0 → Λ(1520) μ+ μ− is measured for the first time, in the squared dimuon mass intervals q^2, excluding the J/ψ and ψ(2S) regions. The data sample analyzed was collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to a total integrated luminosity of 9 fb^−1. The result in the highest q^2 interval, q^2 > 15.0 GeV^2/c^4, where theoretical predictions have the smallest model dependence, agrees with the predictions.

Aaij, R., Abdelmotteleb, A.S.W., Abellan Beteta, C., Abudinén, F., Ackernley, T., Adeva, B., et al. (2023). Measurement of the Λb0 → Λ(1520) μ+ μ− Differential Branching Fraction. PHYSICAL REVIEW LETTERS, 131(15), 1-12 [10.1103/PhysRevLett.131.151801].