Constraining New Physics with the CDF Measurement of CP Violation in $B\to \psi K_S$

Abstract

Recently, the CDF collaboration has reported a measurement of the CP asymmetry in the $B\to \psi K_S$ decay: $a_{\psi K_S}=0.79_{-0.44}^{+0.41}$. We analyze the constraints that follow from this measurement on the size and the phase of contributions from new physics to $B-\barB$ mixing. Defining the relative phase between the full $M_{12}$ amplitude and the Standard Model contribution to be $2{\theta }_d$, we find a new bound: $\sin2θ_d\gsim-0.6 (-0.87)$ at one sigma (95% CL). Further implications for the CP asymmetry in semileptonic B decays are discussed.

13 pages, harvmac, 3 figures; v2: a discussion of new physics effects on tree level decays added; references added; accepted for publication in Physical Review Letters

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• The Little Randall-Sundrum Model at the Large Hadron Collider
• Implications of the CP asymmetry in semileptonic B decay
• Constraining models with vector-like fermions from FCNC in K and B physics
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• Constraining Models of New Physics in Light of Recent Experimental Results on $a_{\psi K_S}$
• The CKM Matrix and The Unitarity Triangle: Another Look
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• Implications of a Low sin(2 beta): A Strategy for Exploring New Flavor Physics
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• TASI 2009 Lectures - Flavor Physics
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