Improved measurement of time-dependent CP asymmetries and the CP-odd fraction in the decay B{sup 0}{yields}D*{sup +}D*{sup -}

Journal Article · Sat Dec 01 04:00:00 EST 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.76.111102· OSTI ID:21023896

Aubert, B; Bona, M; Boutigny, D; Karyotakis, Y; Lees, J P; Poireau, V; Prudent, X; Tisserand, V; Zghiche, A ^[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 ^[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. Universita di Bari, Dipartimento di Fisica and INFN, 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 an updated measurement of the CP-odd fraction and the time-dependent CP asymmetries in the decay B{sup 0}{yields}D*{sup +}D*{sup -} using (383{+-}4)x10{sup 6}BB pairs collected with the BABAR detector. We determine the CP-odd fraction to be 0.143{+-}0.034(stat){+-}0.008(syst). The time-dependent CP asymmetry parameters are determined to be C{sub +}=-0.05{+-}0.14(stat){+-}0.02(syst) and S{sub +}=-0.72{+-}0.19(stat){+-}0.05(syst). The nonzero value of the measured S{sub +} indicates the evidence of CP violation at the 3.7{sigma} confidence level.

• OSTI ID: 21023896
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 76; 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*-2010 MESONS
HADRONIC PARTICLE DECAY
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PEP STORAGE RINGS
QUANTUM CHROMODYNAMICS
TIME DEPENDENCE