signature=06bb5634001c8955e96c2eaafe09da41,Γ(Z → bb): A signature of hard mass terms for a heavy top...

转载于 2021-05-29 13:12:53 发布

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该文详细计算了弱中性流顶夸克-玻色子顶点的辐射修正，考虑了内部fermion线的质量m_t的影响。研究发现，在α阶修正中存在一个与m_t平方成正比的硬质量项，当顶夸克质量在45至200GeV变化时，导致Z0玻色子衰变到b夸克的宽度减少约0.6%至2.5%。这一效应源自非物理的带电希格斯粒子与fermions的耦合，或等价地，来自纵向带电玻色子的耦合。

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摘要：

We calculate analytically the weak radiative corrections to the weak neutral current gauge boson-bottom fermion vertex, keeping the mass mt of the internal fermion line for the relevant diagrams. We find, to order α, a hard mass-term dependence mt2MW2 of the amplitude, for large mt values. Its origin comes from the unphysical charged Higgs coupling to fermions in the renormalizable gauge or, equivalently, from the longitudinal charged gauge boson couplings. The diagonal Z0 decay width to b-quarks decreases, due to these weak radiative corrections, by 0.6%–2.5% when the top mass mt varies from 45 to 200 GeV.

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