### Session Y13: Bs

1:30 PM–3:18 PM, Tuesday, April 17, 2007
Hyatt Regency Jacksonville Riverfront Room: City Terrace 9

Chair: Matthew Herndon, Wisconsin University

Abstract ID: BAPS.2007.APR.Y13.3

### Abstract: Y13.00003 : Measurement of the $B^0_s$ Width Difference and Mixing Phase in the Decay $B^0_s\rightarrow J/\psi \phi$

1:54 PM–2:06 PM

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#### Author:

Avdhesh Chandra
(University of California, Riverside)

In the standard model (SM), the light ($L$) and heavy ($H$) mass eigenstates of the mixed ($B^0_s$, $\bar{B^0_s}$) system are expected to have a sizable mass and decay width difference, $\Delta M \equiv M_H - M_L$ and $\Delta \Gamma \equiv \Gamma_L - \Gamma_H$. The CP violating phase, $\phi_{s}$, defined as the relative phase of the off-diagonal elements of the mass and decay matrices in the $B^0_s$ $-$ $\bar{B^0_s}$ basis, is predicted to be small. From an analysis of the untagged'' $B^0_s\rightarrow J/\psi \phi$ time-dependent angular distributions, we measure the average lifetime ($\overline \tau$), $\Delta \Gamma$, and $\phi_ {s}$. To improve the sensitivity of the measurement, we have extended this analysis by using flavor tagging information when available.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.APR.Y13.3