22-28 July 2010
Palais des Congrès de Paris
Europe/Paris timezone

D0-D0bar Mixing and CP Asymmetry Measurements at BABAR

23 Jul 2010, 17:00
13m
Salle 242A ()

Salle 242A

Parallel Session Talk 06 - CP violation, CKM and Rare Decays 06 - CP violation, CKM and Rare Decays

Speaker

Matthew Bellis (Stanford University)

Description

We report on D0 mixing and searches for CP violation in charm meson decays using the large sample of charm anti-charm produced in e+e- annihilation data collected with the BaBar detector at the PEP-II asymmetric-energy B Factory near a center-of-mass energy of 10.58 GeV. A direct measurement of D0-D0bar mixing parameters through a time-dependent amplitude analysis of the Dalitz plots of D^0 --> K^0_S pi^+ pi^- and, for the first time, D^0 --> K^0_S K^+ K^- decays is reported. We measure the mixing parameters x and y and provide the best measurement to date of x. We also report on a search for CP violation in the decay D^+ --> K^0_S pi^+. In the Standard Model, direct CP violation in charm meson decays is predicted to occur at the level of 10^-3 or below. In the decay D^+ --> K^0_S pi^+, a direct CP asymmetry, at the level of 0.33%, is expected from K^0/anti{K}^0 mixing in the final state with any asymmetry significantly different than that being a signature for new physics. In addition, we report on a search for CP violation in Cabibbo suppressed D+ --> K0s K+ pi+ pi- decays and allowed Ds+ --> K0s K+ pi+ pi- decays which is signaled by the difference between the T-odd asymmetries, obtained using triple product correlations, measured for D(s)+ and D(s)- decays.

Primary author

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