Measurement of Time-Dependent CP Asymmetries and the CP-Odd Fraction in the Decay B^0→D+D−

Creators: Aubert, B.; Albert, J.; Chen, E.; Dubois-Felsmann, G. P.; Dvoretskii, A.; Hitlin, D. G.; Narsky, I.; Porter, F. C.; Ryd, A.; Samuel, A.; Yang, S.; BaBar Collaboration

Abstract

We present a measurement of time-dependent CP asymmetries and an updated determination of the CP-odd fraction in the decay B^0→D*+D*− using a data sample of 88×10^6 BB[overbar] pairs collected by the BABAR detector at the PEP-II B Factory at SLAC. We determine the CP-odd fraction to be 0.063±0.055(stat)±0.009(syst). The time-dependent CP asymmetry parameters Im(λ_+) and |λ_+|are determined to be 0.05±0.29(stat)±0.10(syst) and 0.75±0.19(stat)±0.02(syst), respectively. The standard model predicts these parameters to be −sin2β and 1, respectively, in the absence of penguin diagram contributions.

Additional Information

© 2003 The American Physical Society. Received 21 June 2003. We are grateful for the excellent luminosity and machine conditions provided by our PEP-II colleagues and for the substantial dedicated effort from the computing organizations that support BABAR. The collaborating institutions wish to thank SLAC for its support and kind hospitality. This work is supported by the DOE and NSF (USA), NSERC (Canada), IHEP (China), CEA and CNRS-IN2P3 (France), BMBF and DFG (Germany), INFN (Italy), FOM (The Netherlands), NFR (Norway), MIST (Russia), and PPARC (United Kingdom). Individuals have received support from the A. P. Sloan Foundation, the Research Corporation, and the Alexander von Humboldt Foundation.

Attached Files

Published - PhysRevLett.91.131801.pdf

Files

PhysRevLett.91.131801.pdf

Files (163.0 kB)

Name	Size	Download all
PhysRevLett.91.131801.pdf md5:71df0e3a2174dd11118eb4a7ffe7503e	163.0 kB	Preview Download

Additional details

	All versions	This version
Views	0	0
Downloads	0	0
Data volume	0 Bytes	0 Bytes