arXiv subjects

Keyan Yang

Publications and source records attributed to Keyan Yang.

2 recordsLinked to original sources

arXiv1995

Towards Yukawa unification in a strongly Yukawa coupling model

For strong enough Yukawa coupling the electroweak standard model fermion finds it energetically advantageous to transform itself into a bound state in the hedgehog background of Higgs field in semiclassical approximation. By considering the bound states give the masses for lepton and quark, we found that all the strongly Yukawa coupling constants tend to an unitary constant. On the other hand, the masses of $W$ and $Z$ produced by the hedgehog Higgs field keep almost no change.

hep-ph↗

arXiv1995

Fermion number violation in heavy fermion decay

The presence of a heavy fermion doublet of fourth generation in the standard model would lead to a anomalous decay with fermion number non-conservation. The anomalous decay path in the background of the electroweak instanton is demonstrated by numerical calculation. If the mass of fermion exceeds the critical value $m_f^{\rm cr}$=9.2 TeV (for $M_H=M_W$), it is shown that there exists the rapid anomalous decay of the heavy fermion in semi-classical approximation. The dependence of the critical fermion mass on the Higgs mass is also presented.

hep-ph↗