Constraining extensions of the quark sector with the CP asymmetry in B→ψKS

被引：0
作者：
Eyal, G [1 ]
Nir, Y [1 ]
机构：
[1] Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel
来源：
JOURNAL OF HIGH ENERGY PHYSICS | 1999年 / 09期
关键词：
beyond standard model; B-physics; CP violation;
D O I：
暂无
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
Models with extended quark sector affect the CP asymmetry in the B --> 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 - (B) over bar mixing. Second, the 3 x 3 CKM matrix is no longer unitary. We analyze the constraints that follow from the CDF measurement, a psi K-S = 0.79(-0.44)(+0.41), 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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页数：11
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