2026-04-14T08:34:02Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1313982025-11-21T05:50:47Zcom_2072_1057col_2072_478823col_2072_478917

Measurement of branching fractions in radiative B decays to ηKγ and search for B decays to η′Kγ Graugés Pous, Eugeni BABAR Collaboration Física de partícules Experiments Particle physics Experiments We present measurements of the B → η K γ branching fractions and upper limits for the B → η ′ K γ branching fractions. For B + → η K + γ we also measure the time-integrated charge asymmetry. The data sample, collected with the BABAR detector at the Stanford Linear Accelerator Center, represents 232 × 10 6 produced B ¯¯¯ B pairs. The results for branching fractions and upper limits at 90% confidence level in units of 10 − 6 are: B ( B 0 → η K 0 γ ) = 11.3 + 2.8 − 2.6 ± 0.6 , B ( B + → η K + γ ) = 10.0 ± 1.3 ± 0.5 , B ( B 0 → η ′ K 0 γ ) < 6.6 , B ( B + → η ′ K + γ ) < 4.2 . The charge asymmetry in the decay B + → η K + γ is A ch = − 0.09 ± 0.12 ± 0.01 . The first errors are statistical and the second systematic. 2019-04-04T11:57:00Z 2019-04-04T11:57:00Z 2006 2019-04-04T11:57:00Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1550-7998 https://hdl.handle.net/2445/131398 550058 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.74.031102 Physical Review D, 2006, vol. 74, num. 3, p. 031102(R) https://doi.org/10.1103/PhysRevD.74.031102 (c) American Physical Society, 2006 info:eu-repo/semantics/openAccess 8 p. application/pdf application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)