منابع مشابه
The Decay Rate Asymmetry of the Top Quark
The asymmetries Ak ≡ [Γ(t → Wdk)−Γ(t̄ → Wd̄k)]/[Γ(t → Wdk)+Γ(t̄ → Wd̄k)] in the partial widths of the top quark decays are discussed within the Standard Model (SM), the Two-Higgs-Doublet Model (2HDM) and supersymmetric extensions of the SM (SSM). The leading contributions to these asymmetries in the SM and in the 2HDM are induced by the up-type quark self-energy diagrams and are found to be very sm...
متن کاملDecay Rate Asymmetry of the Top Quark through Light
A decay rate asymmetry of the top quark is discussed within the framework of the supersymmetric standard model. Although new sources of CP violation in this model are severely constrained from the electric dipole moments of the neutron and the electron, there is a possibility that a top squark has a mass of around 100 GeV and CP violation in its interaction with a top quark is unsuppressed. The...
متن کاملElectroweak Corrections to the Top Quark Decay
We have calculated the one-loop electroweak corrections to the decay t→ bW, including the counterterm for the CKM matrix elements Vtb. Previous calculations used an incorrect δVtb that led to a gauge dependent amplitude. However, since the contribution stemming from δVtb is small, those calculations only underestimate the width by roughly one part in 10. PACS number(s): 12.15.Lk, 11.10.Gh, 12.1...
متن کاملRate Induced by the Top Quark
We present the two-loop QED and QCD corrections to the f f̄H Yukawa coupling that are induced by the exchange of a virtual photon or gluon, respectively, with a heavy-fermion loop inserted. As an application, we study the corresponding O(αsM H/mt ) correction to the H → bb̄ decay rate. A Higgs boson with MH ∼< 135 GeV decays dominantly to bb̄ pairs [1]. This decay mode will be of prime importance ...
متن کاملMeasurements of top quark decay properties
I report on measurements of the properties of the top quark using data collected by the CDF and DØ detectors during Run II of the Fermilab Tevatron. The helicity of the W boson arising from top quark decay, the top quark decay branching ratios, and the top quark charge have all been measured, and the results in all cases are consistent with standard model expectations.
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1993
ISSN: 0370-2693
DOI: 10.1016/0370-2693(93)91761-b