2026-04-17T17:23:12Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1236452025-12-05T16:40:37Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Search for mixing-induced CP violation using partial reconstruction of B¯0→D*+Xℓ−ν¯ℓ and kaon tagging Graugés Pous, Eugeni BABAR Collaboration Partícules (Matèria) Mesons (Física nuclear) Violació CP (Física nuclear) Particles Mesons (Nuclear physics) CP violation (Nuclear physics) We describe in detail a previously published measurement of C P violation in B 0 - ¯ B 0 oscillations, based on an integrated luminosity of 425.7     fb − 1 collected by the BABAR experiment at the PEPII collider. We apply a novel technique to a sample of about 6 million ¯ B 0 → D * + ℓ − ¯ ν ℓ decays selected with partial reconstruction of the D * + meson. The charged lepton identifies the flavor of one B meson at its decay time, the flavor of the other B is determined by kaon tagging. We determine a C P violating asymmetry A C P = ( N ( B 0 B 0 ) − N ( ¯ B 0 ¯ B 0 ) ) / ( N ( B 0 B 0 ) + N ( ¯ B 0 ¯ B 0 ) ) = ( 0.06 ± 0.1 7 + 0.38 − 0.32 ) % corresponding to Δ C P = 1 − | q / p | = ( 0.29 ± 0.8 4 + 1.88 − 1.61 ) × 1 0 − 3 . This measurement is consistent and competitive with those obtained at the B factories with dilepton events. 2018-07-16T10:06:05Z 2018-07-16T10:06:05Z 2016-02-08 2018-07-16T10:06:05Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2470-0010 https://hdl.handle.net/2445/123645 658766 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.93.032001 Physical Review D, 2016, vol. 93, num. 3, p. 032001-1-032001-13 https://doi.org/10.1103/PhysRevD.93.032001 (c) American Physical Society, 2016 info:eu-repo/semantics/openAccess 1 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)