### 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.Y13.1

### Abstract: Y13.00001 : Lifetime Difference and $CP$ Asymmetry in the $B_s^0 \to J/\psi \phi$ Mode

1:30 PM–1:42 PM

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#### Author:

Khaldoun Makhoul
(MIT)

We report on the progress of the analysis of $B^0_s \to J/\psi \phi$ decays to extract the parameters $\Delta \Gamma_s / \Gamma_s$ and $\sin 2 \beta_s$ using 1.4~fb$^{-1}$ of data taken with the CDF\,II detector. The use of a time-dependent angular analysis can separate the $CP$~eigenstates of the $B^0_s$~meson to determine their separate lifetimes. Further tagging of the $B^0_s$ meson at time $t=0$ as $B^0_s$ or $\bar{B}^0_s$, allows for the analysis of the $CP$ asymmetry, which then yields the $\sin 2 \beta_s$ parameter. The $\Delta \Gamma_s$ measurement is an improved analysis using additional data, neural network selection for better signal/background, and reduced systematic errors. The $\sin 2 \beta_s$ measurement is the first such analysis at CDF.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.APR.Y13.1