2026-04-14T02:07:56Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1316502025-12-05T16:56:48Zcom_2072_1057col_2072_478823col_2072_478917

00925njm 22002777a 4500 dc Garra Ticó, Jordi author Graugés Pous, Eugeni author BABAR Collaboration author 2019-04-05T11:39:35Z 2019-04-05T11:39:35Z 2009-02-09 2019-04-05T11:39:35Z We present new measurements of time-dependent C P asymmetries for B 0 → D ( * ) + D ( * ) − decays using ( 467 ± 5 ) × 10 6 B ¯¯¯ B pairs collected with the BABAR detector located at the PEP-II B Factory at the Stanford Linear Accelerator Center. We determine the C P -odd fraction of the B 0 → D * + D * − decays to be R ⊥ = 0.158 ± 0.028 ± 0.006 and find C P asymmetry parameters S + = − 0.76 ± 0.16 ± 0.04 and C + = + 0.00 ± 0.12 ± 0.02 for the C P -even component of this decay and S ⊥ = − 1.80 ± 0.70 ± 0.16 and C ⊥ = + 0.41 ± 0.49 ± 0.08 for the C P -odd component. We measure S = − 0.63 ± 0.36 ± 0.05 and C = − 0.07 ± 0.23 ± 0.03 for B 0 → D + D − , S = − 0.62 ± 0.21 ± 0.03 and C = + 0.08 ± 0.17 ± 0.04 for B 0 → D * + D − , and S = − 0.73 ± 0.23 ± 0.05 and C = + 0.00 ± 0.17 ± 0.03 for B 0 → D + D * − . For the B 0 → D * ± D ∓ decays, we also determine the C P -violating asymmetry A = + 0.008 ± 0.048 ± 0.013 . In each case, the first uncertainty is statistical and the second is systematic. The measured values for the asymmetries are all consistent with the standard model. Física de partícules Experiments Particle physics Experiments Measurements of time-dependent CP asymmetries in B0→D(*)+D(*)− decays