Measurements of time-dependent CP asymmetries in B{sup 0}{yields}D{sup (*)+}D{sup (*)-} decays

Journal Article · Sun Feb 01 04:00:00 EST 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.032002· OSTI ID:21259870

Aubert, B; Bona, M; Karyotakis, Y; Lees, J P; Poireau, V; Prencipe, E; Prudent, X; Tisserand, V ^[1]; Tico, J Garra; Grauges, E ^[2]; Lopez, L; Palano, A; Pappagallo, M ^[3]; Eigen, G; Stugu, B; Sun, L ^[4]; Abrams, G S; Battaglia, M; Brown, D N; Cahn, R N ^[5]

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1. Laboratoire de Physique des Particules, IN2P3/CNRS et Universite de Savoie, F-74941 Annecy-Le-Vieux (France)
2. Universitat de Barcelona, Facultat de Fisica, Departament ECM, E-08028 Barcelona (Spain)
3. INFN Sezione di Bari, I-70126 Bari (Italy)
4. University of Bergen, Institute of Physics, N-5007 Bergen (Norway)
5. Lawrence Berkeley National Laboratory and University of California, Berkeley, California 94720 (United States)

We present new measurements of time-dependent CP asymmetries for B{sup 0}{yields}D{sup (*)+}D{sup (*)-} decays using (467{+-}5)x10{sup 6} BB pairs collected with the BABAR detector located at the PEP-II B Factory at the Stanford Linear Accelerator Center. We determine the CP-odd fraction of the B{sup 0}{yields}D*{sup +}D*{sup -} decays to be R{sub perpendicular}=0.158{+-}0.028{+-}0.006 and find CP asymmetry parameters S{sub +}=-0.76{+-}0.16{+-}0.04 and C{sub +}=+0.00{+-}0.12{+-}0.02 for the CP-even component of this decay and S{sub perpendicular}=-1.80{+-}0.70{+-}0.16 and C{sub perpendicular}=+0.41{+-}0.49{+-}0.08 for the CP-odd component. We measure S=-0.63{+-}0.36{+-}0.05 and C=-0.07{+-}0.23{+-}0.03 for B{sup 0}{yields}D{sup +}D{sup -}, S=-0.62{+-}0.21{+-}0.03 and C=+0.08{+-}0.17{+-}0.04 for B{sup 0}{yields}D*{sup +}D{sup -}, and S=-0.73{+-}0.23{+-}0.05 and C=+0.00{+-}0.17{+-}0.03 for B{sup 0}{yields}D{sup +}D*{sup -}. For the B{sup 0}{yields}D*{sup {+-}}D{sup {+-}} decays, we also determine the CP-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.

• OSTI ID: 21259870
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 3 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B NEUTRAL MESONS
CP INVARIANCE
D MINUS MESONS
D PLUS MESONS
DATA ANALYSIS
MESON FACTORIES
PARTICLE DECAY
STANDARD MODEL
STANFORD LINEAR ACCELERATOR CENTER
TIME DEPENDENCE