Measurement of Polarization and Search for CP-Violation in $B_s^0\to \varphi \varphi$ Decays

Abstract

We present the first measurement of polarization and CP-violating asymmetries in $B_s^0$ decays into two light vector mesons, $B_s^0\to \varphi \varphi$, and an improved determination of its branching ratio using 295 decays reconstructed in a data sample corresponding to 2.9 fb^-1 of integrated luminosity collected by the CDF experiment at the Fermilab Tevatron collider. The fraction of longitudinal polarization is determined to be $\fL = 0.348 \pm 0.041 ({\rm stat}) \pm 0.021 ({\rm syst})$, and the branching ratio $BR($B_s^0 \to ϕϕ$)=[2.32\pm 0.18(\mathrm{stat})\pm 0.82(\mathrm{syst})]\times 10^{-5}$. Asymmetries of decay angle distributions sensitive to \CP\ violation are measured to be $ A_u = - 0.007 \pm 0.064 \stat \pm 0.018 \syst$ and $ A_v = -0.120 \pm 0.064 \ stat \pm 0.016\syst$.

published version, sign corrected in eq. 2

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