# Europhysics Conference on High-Energy Physics 2011

Jul 20 – 27, 2011
Alpes Congrès - Alpexpo
Europe/Paris timezone

## Measurements of CP violation in the Bs system at D0

Jul 21, 2011, 3:15 PM
15m
Oisans (Alpes Congrès - Alpexpo)

### Oisans

#### Alpes Congrès - Alpexpo

Parallel session talk Flavour Physics and Fundamental Symmetries

### Speaker

Dr Sergey Burdin (University of Liverpool)

### Description

We report a new measurement of the $CP$-violating phase $\phi_s$, of the decay width difference for the two mass eigenstates $\Delta \Gamma_s$, of the mean $B^0_s$ lifetime $\overline{\tau}_s$, and of magnitudes of the decay amplitudes, from the flavor-tagged decay $B^0_s\to J/\psi \phi$. For the first time, we consider possible contributions from the decay $B^0_s \rightarrow J/\psi K^+K^-$, with the $K^+K^-$ in a $s$ wave. This measurement is based on 8 fb$^{-1}$ of $p\overline{p}$ collisions recorded with the D0 detector at a center-of-mass energy $\sqrt{s} = 1.96$ TeV at the Fermilab Tevatron collider. We also present a combination of the constraints on the $B^0_s$ width difference, $\Delta\Gamma_s$, and of the $CP$-violating phase, $\phi_s$ obtained combining with measurement with the results from the search for CP violation in semileptonic $B^0_s\rightarrow\mu^+D^-_sX$ decays, the measurement of the branching ratio for the decay $B^0_s\rightarrow D^{(*)+}_s D^{(*)-}_s$ and the measurement of the like-sign asymmetry for semileptonic $b$ decays. Finally the prospects for including additional information from the $B^0_s\to J/\psi f_0(980)$, $f_0(980)\to\pi^+\pi^-$ decay are also discussed.

### Primary author

Dr Sergey BURDIN (University of Liverpool, UK)

### Presentation materials

 Transparents