# ICHEP 2010

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

### 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.

 Slides