Measurement of the Λ_{b}^{0}→Λ(1520)μ^{+}μ^{-} Differential Branching Fraction

• Published in: Physical review letters Vol. 131; no. 15; p. 151801
• Main Authors: Adlarson, P, Agapopoulou, C, Anderlini, L, Andreou, D, Bay, A, Bernet Andres, S, Bernstein, H C, Boldyrev, A, Bondar, N, Bowcock, T J V, Brossa Gonzalo, A, Carniti, P, Caspary, R, Cattaneo, M, Chubykin, A, Couturier, B, Cruz Torres, M, Dalseno, J, D'Ambrosio, C, De Cian, M, Dedu, V, Di Nezza, P, Dobishuk, V, Epple, E, Fan, Y, Felkowski, L, Fernez, A D, Fiutowski, T, Friday, D A, Frontini, L, Fuehring, Q, Gerick, D, Gershon, T, Gibson, V, Goncerz, M, Haimberger, J, Hou, R, Hushchyn, M, Jans, E, Jones, T P, Keller, D M, Kondybayeva, A, Kretzschmar, S, Kucharczyk, M, Kupsc, A, Lane, R, Liu, Q, Luppi, E, Majewski, M W, Manera Escalero, R, Massafferri, A, Mathad, A, Mauri, A, McNulty, R, Meyer Garcia, L, Mikhasenko, M, Milanes, D A, Morris, A G, Muzzetto, P, Neustroev, P, Newcombe, R, Ovsiannikova, T, Oyanguren, A, Pastore, A, Patrignani, C, Pepe Altarelli, M, Perret, P, Petrucci, S, Pham, H, Placinta, V, Prouve, C, Raven, G, Rolf, D L, Ruiz Vidal, J, Ryzka, J, Schertz, A M, Schwemmer, R, Sciascia, B, Senghi Soares, M, Siddi, B G, Simi, G, Spadaro Norella, E, Stahl, M, Stevens, H, Tisserand, V, Tonani, G, Usachov, A, van Herwijnen, E, Vos, K, Wang, G, Wang, X, Wiederhold, A R, Wong, C P, Wotton, S A, Wyllie, K, Yang, S, Yeroshenko, V, Yin, H, Yuan, X, Zeng, M
• Format: Journal Article
• Language: English
• Published: 13-10-2023
• ISSN: 1079-7114
• DOI: 10.1103/PhysRevLett.131.151801

The branching fraction of the rare decay Λ_{b}^{0}→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.