科研之友
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摘要
We calculate the Yukawa corrections of order O(alpha(ew)m(t(b))(2)/m(W)(2)), O(alpha(ew)m(t(b))(3)/m(W)(3)), and O(alpha(ew)m(t(b))(4)/m(W)(4)) to the widths of the decays (t) over tilde (2)-->(t) over tilde (1)+(h(0),H-0,A(0)) in the minimal supersymmetric standard model, and perform a detailed numerical analysis. We also compare the results with the ones presented in earlier literature, where the <tcal>O</tcal>(alpha(s)) supersymmetric (SUSY) QCD corrections to the same three decay processes have been calculated. Our numerical results show that, for the decays (t) over tilde (2)-->(t) over tilde (1)+h(0), (t) over tilde (2)-->(t) over tilde (1)+H-0, the Yukawa corrections are significant in most of the parameter range, and can reach approximately 10%; for the decay (t) over tilde (2)-->(t) over tilde (1)+A(0), the Yukawa corrections are smaller, only a few percent. The numerical calculations also show that using the running quark masses and the running trilinear coupling A(t), including the QCD, SUSY QCD, and SUSY-electroweak effects, and resumming all high order (tan beta)-enhanced effects, can vastly improve the convergence of the perturbation expansion. We also discuss the effects of the running of the Higgsino mass parameter mu on the corrections, and find that they are significant, too, especially for large tan beta.
- 出版日期2002-12-1
- 单位北京大学
