Evidence of time-dependent CP violation in the decay B{sup 0}{yields}D*{sup +}D*{sup -}

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

DOI:https://doi.org/10.1103/PHYSREVD.80.111104· OSTI ID:21313429

Vervink, K; Schneider, O; Bay, A; Louvot, R; Zwahlen, N ^[1]; Aushev, T ^[1]; Arinstein, K; Bondar, A; Eidelman, S; Gabyshev, N; Kuzmin, A; Poluektov, A; Shwartz, B; Zhilich, V; Zhulanov, V ^[2]; Bakich, A M; McOnie, S; Yabsley, B D ^[3]; Balagura, V; Chistov, R ^[4]

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1. Ecole Polytechnique Federale de Lausanne (EPFL), Lausanne (Switzerland)
2. Budker Institute of Nuclear Physics, Novosibirsk (Russian Federation)
3. University of Sydney, Sydney, New South Wales (Australia)
4. Institute for Theoretical and Experimental Physics, Moscow (Russian Federation)

We report a measurement of the CP-odd fraction and the time-dependent CP violation in B{sup 0}{yields}D*{sup +}D*{sup -} decays, using 657x10{sup 6} BB events collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider. We measure a CP-odd fraction of R{sub perpendicular}=0.125{+-}0.043(stat){+-}0.023(syst). From the distributions of the proper-time intervals between a B{sup 0}{yields}D*{sup +}D*{sup -} decay and the other B meson in the event, we obtain evidence of CP violation with measured parameters A{sub D*{sup +}}{sub D*{sup -}}=0.15{+-}0.13(stat){+-}0.04(syst) and S{sub D*{sup +}}{sub D*{sup -}}=-0.96{+-}0.25(stat){sub -0.16}{sup +0.13}(syst)

• OSTI ID: 21313429
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 80; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
B MESONS
B NEUTRAL MESONS
CP INVARIANCE
D MINUS MESONS
D PLUS MESONS
DISTRIBUTION
ELECTRON-POSITRON COLLISIONS
PARTICLE DECAY
RESONANCE
TIME DEPENDENCE
VECTOR MESONS