Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2004-08-17
Physics
High Energy Physics
High Energy Physics - Experiment
26 pages, 15 figures, Contributed to the 32nd International Conference on High-Energy Physics, ICHEP 04, 16 August-22 August 2
Scientific paper
We report on a study of direct CP violation in the decay B- -> D(*)0 K- with a Dalitz analysis of the D0 -> Ks pi- pi+ decay using a sample of 227 million BBbar pairs collected by the BaBar detector. Reference to the charge-conjugate state is implied here. We constrain the amplitude ratio rB=|A(B- -> D0bar K-)|/|A(B- -> D0 K-)| to be <0.19 at the 90% confidence level and rB*=|A(B- -> D*0bar K-)|/|A(B- -> D*0 K-)| = 0.155 +0.070-0.077 +/- 0.040 +/- 0.020 and we measure the relative strong phase deltaB=(114 +/- 41 +/- 8 +/- 10) deg and deltaB*=(303 +/- 34 +/- 14 +/- 10) deg between the amplitudes A(B- -> D(*)0bar K-) and A(B- -> D(*)0 K-). From these samples we measure gamma =(70 +/- 26 +/- 10 +/- 10) deg. The first error is statistical, the second error accounts for experimental uncertainties and the third error reflects the Dalitz model uncertainty. For this preliminary result we have quoted confidence intervals obtained with a Bayesian technique assuming a uniform prior in rB, gamma and deltaB.
Aubert B.
BABAR Collaboration
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