Abellan Beteta, CarlosCalvo Gómez, MíriamCamboni, AlessandroComerma Montells, AlbertDomingo Bonal, FrancescGarrido Beltrán, LluísGascón Fora, DavidGrabalosa Gándara, MarcGraciani Díaz, RicardoGraugés Pous, EugeniLópez Asamar, EliasMusy, MarcoPérez-Calero Yzquierdo, AntonioPicatoste Olloqui, EduardoPie Valls, B. (Blai)Potterat, CédricPuig Navarro, AlbertRoselló, M.Ruiz, Hugo (Ruiz Pérez)Vázquez Gómez, RicardVilasis-Cardona, XavierLHCb Collaboration2019-04-082019-04-082012-06-011550-7998https://hdl.handle.net/2445/131780The ratio of branching fractions of the radiative B decays B 0 → K * 0 γ and B 0 s → ϕ γ has been measured using 0.37     fb − 1 of p p collisions at a center of mass energy of √ s = 7     TeV , collected by the LHCb experiment. The value obtained is B ( B 0 → K * 0 γ ) B ( B 0 s → ϕ γ ) = 1.12 ± 0.08 + 0.06 + 0.09 − 0.04 − 0.08 , where the first uncertainty is statistical, the second systematic, and the third is associated with the ratio of fragmentation fractions f s / f d . Using the world average for B ( B 0 → K * 0 γ ) = ( 4.33 ± 0.15 ) × 10 − 5 , the branching fraction B ( B 0 s → ϕ γ ) is measured to be ( 3.9 ± 0.5 ) × 10 − 5 , which is the most precise measurement to date.8 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2012http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6189802019-04-08info:eu-repo/semantics/openAccess