兆量级等单重夸克的非退耦与稀有K和B衰变
Nondecoupling of a terascale isosinglet quark and rare K and B decays
摘要：
我们研究了最近的标准模型的扩展与向上型矢量类等单线T夸克，占主导地位的混合与顶夸克。我们仔细研究了非退耦效应，它可能通过与稀有衰变相关的回路图揭示这样一种新的重费米子，如K-->pi nu nu-bar，B-->pi（K）nu nu-bar和B_{s,d} -->mu^+ mu^-。在详细论证了非解耦项之间的相互抵消后，我们证明了~ s^2 ln{m_T^2}和~ s^4 m_T^2以互补的方式起作用，使得衰变率的最大允许值实际上与m_T无关。虽然它们对应于K-->pi nu-bar和B-->pi（K）nu-bar的SM率的~ 20%或~ 30%的修正，但B_{s,d} -->mu^+ mu^-衰变的~ 50%的增加提供了通过在大型强子对撞机上测量这些衰变来揭示额外的等单线态的可能性。
英文摘要：
We examine recent extensions of the standard model with an up-type vectorlike isosinglet T quark that mixes dominantly with the top quark. We take under scrutiny the nondecoupling effects which may reveal such a new heavy fermion through loop diagrams relevant for rare decays such as K-->pi nu nu-bar, B-->pi(K) nu nu-bar, and B_{s,d}-->mu^+ mu^-. After demonstrating in detail the cancellation between the leading nondecoupling terms, we show that two residual forms ~ s^2 ln{m_T^2} and ~ s^4 m_T^2 act in complementary way, so that the maximal allowed values of the decay rates are practically independent of m_T. While they correspond to ~ 20% or ~ 30% corrections to the SM rates for K-->pi nu nu-bar and B-->pi(K) nu nu-bar, an increase by ~ 50% for B_{s,d}-->mu^+ mu^- decays offers a possibility to reveal an additional isosinglet state by measurements of these decays at the Large Hadron Collider.
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