Constraining Extensions of the Quark Sector with the CP Asymmetry in $B\to ψK_{S}$

Details Constraining Extensions of the Quark Sector with the CP Asymmetry in $B\to ψK_{S}$ Constraining Extensions of the Quark Sector with the CP Asymmetry in $B\to ψK_{S}$

1999-08-08

arxiv.org/abs/hep-ph/9908296v1

JHEP 9909:013,1999

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, LaTeX, 3 figures

Scientific paper

10.1088/1126-6708/1999/09/013

Models with extended quark sector affect the CP asymmetry in the $B\to \psi K_{S}$ decay, $a_{\psi K_{S}}$, in two ways: First, the top-mediated box diagram is not necessarily the only important contribution to $B-\bar{B}$ mixing. Second, the $3\times 3$ CKM matrix is no longer unitary. We analyze the constraints that follow from the CDF measurement, $a_{\psi K_{S}} =0.79^{+0.41}_{-0.44}$, on the mixing parameters of extended quark sectors. Most noticeably, we find significant constraints on the phase of the relevant flavor changing $Z$ coupling in models with extra down quarks in vector-like representations. Further implications for the CP asymmetry in semileptonic $B$ decays are discussed.

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