# DPF 2011

8-13 August 2011
Rhode Island Convention Center
US/Eastern timezone

## Measurement of CP violating parameters in the decay Bs -> J/psi phi

10 Aug 2011, 17:42
24m
551 B (Rhode Island Convention Center)

### 551 B

#### Rhode Island Convention Center

Parallel contribution CP-Violation

### Speaker

Dr Avdhesh Chandra (Rice University)

### 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.

### Primary author

Dr Avdhesh Chandra (Rice University)

 Slides