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Aaij, R; Beteta, C. Abellán; Adeva, B; Adinolfi, M; Aidala, C. A; Ajaltouni, Z; Akar, S
The European physical journal. C, Particles and fields, 08/2019, Letnik: 79, Številka: 8Journal Article
A search for the rare leptonic decay Formula omitted is performed using proton-proton collision data corresponding to an integrated luminosity of Formula omitted collected by the LHCb experiment. The search is carried out in the region where the lowest of the two Formula omitted mass combinations is below Formula omitted. The data are consistent with the background-only hypothesis and an upper limit of Formula omitted at 95% confidence level is set on the branching fraction in the stated kinematic region.
