2026-04-13T02:44:43Zhttps://recercat.cat/oai/requestoai:recercat.cat:2445/1316502025-12-05T16:56:48Zcom_2072_1057col_2072_478823col_2072_478917
RECERCAT
author
Garra Ticó, Jordi
author
Graugés Pous, Eugeni
author
BABAR Collaboration
2019-04-05T11:39:35Z2019-04-05T11:39:35Z2009-02-092019-04-05T11:39:35Z
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.
(c) American Physical Society, 2009 info:eu-repo/semantics/openAccess
Física de partícules
Experiments
Particle physics
Experiments
Measurements of time-dependent CP asymmetries in B0→D(*)+D(*)− decays
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