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New Measurement of the Bs Mixing Phase at CDF · Around

2010

New Measurement of the Bs Mixing Phase at CDF

Giurgiu, Gavril

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The CDF collaboration presents an updated measurement of the CP-violating parameter beta_s and of the decay width difference Delta Gamma_s using approximately 6500 Bs to J/Psi Phi decays collected by the dimuon trigger and reconstructed in a data sample corresponding to 5.2/fb of integrated luminosity.

Besides exploiting the two-fold increase in the data sample with respect to the previous measurement, several improvements have been introduced in the analysis including a fully data-driven flavor tagging calibration and proper treatment of possible S-wave contributions.
We find that the CP-violating phase is within the range beta_s in [0.02, 0.52] U [1.08,1.55] at 68C.L.
The Standard Model p-value is 0.31.

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Then

M. Gronau and J.L. Rosner, Phys. Lett. B 669:321-326 (2008)
2008
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S. Stone and L. Zhang, Phys. Rev. D 79
2009
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R. van Kooten, CP violation studies in the B s B_{s} system at D0, ICHEP 2010 proceedings
2010
Closest in time.
L. Oakes, Measurement of β s \beta_{s} at CDF, FPCP 2010 proceedings
2010
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