First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in $B^0_{s} \to J/\psi \phi$ Decays

This Letter describes the first determination of bounds on the CP-violation parameter 2*beta_s using Bs decays in which the flavor of the bottom meson at production is identified. The result is based on approximately 2,000 Bs -> J/psi phi decays reconstructed in a 1.35 fb-1 data sample collected with the CDF II detector using p-bar p collisions produced at the Fermilab Tevatron. We report confidence regions in the two-dimensional space of 2*beta_s and the decay-width difference Delta-Gamma. Assuming the standard model predictions of 2*beta_s and Delta-Gamma, the probability of a deviation as large as the level of the observed data is 15%, corresponding to 1.5 Gaussian standard deviations. Dedicated to the memory of our dear friend and colleague, Michael P. Schmidt.

Note:

7 pages, 2 figures, submitted to PRL

11.30.Er
13.25.Hw
anti-p p: colliding beams
anti-p p: inclusive reaction
B/s0: hadroproduction
B/s0: hadronic decay
J/psi(3100)
Phi(1020)
B/s0 anti-B/s0: mixing
CP: violation

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First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in Bs0→J/ψϕB^0_{s} \to J/\psi \phiBs0​→J/ψϕ Decays

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First Flavor-Tagged Determination of Bounds on Mixing-Induced CP Violation in $B^0_{s} \to J/\psi \phi$ Decays