0000000000813748
AUTHOR
Galit Eyal
Constraining new physics with the Fermilab measurement of CP violation in B ->psi K-s
Recently, the CDF Collaboration has reported a measurement of the CP asymmetry in the B --> psi K-s decay: a(psi K), = 0.74(-0.44)(+0.44). We analyze the constraints that follow from this measurement on the size and the phase of contributions from new physics to B-B mixing. Defining the relative phase between the full Mt:! amplitude and the standard model contribution to be 2 theta(d), we find a new bound: sin2 theta(d) greater than or similar to -0.6 (-0.87) at 1 sigma (95% C.L.). Further implications for the CP asymmetry in semileptonic B decays are discussed.
Constraining New Physics with the Fermilab Measurement ofCPViolation inB→ψKs
Recently, the CDF Collaboration has reported a measurement of the CP asymmetry in the $B\ensuremath{\rightarrow}\ensuremath{\psi}{K}_{s}$ decay: ${a}_{\ensuremath{\psi}{K}_{s}}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.79}_{\ensuremath{-}0.44}^{+0.41}$. We analyze the constraints that follow from this measurement on the size and the phase of contributions from new physics to $B\ensuremath{-}\overline{B}$ mixing. Defining the relative phase between the full ${M}_{12}$ amplitude and the standard model contribution to be $2{\ensuremath{\theta}}_{d}$, we find a new bound: $\mathrm{sin}2{\ensuremath{\theta}}_{d}\ensuremath{\gtrsim}\ensuremath{-}0.6(\ensuremath{-}0.87)$ at $1\ensuremat…