分类: 物理学 >> 基本粒子与场物理学 提交时间: 2016-05-16
摘要: We calculate the O(alpha(cw)M(t)(2)/M-W(2)) supersymmetric (SUSY) electroweak corrections to single top quark production via --> at the Fermilab Tevatron in the minimal supersymmetric model. The supersymmetric electroweak corrections to the cross section are at most a few percent for tan beta > 1, but can exceed 10% for tan beta < 1. The combined effects of SUSY electroweak corrections and the Yukawa corrections can exceed 10% for favorable parameter values, which might be observable at a high-luminosity Tevatron.
分类: 物理学 >> 基本粒子与场物理学 提交时间: 2016-05-16
摘要: The O(alpha m(t)(2)/m(w)(2)) Yukawa corrections to top quark pair production in photon-photon collisions ate calculated in the standard model (SM), the general two-Higgs-doublet model (2HDM), as well as the minimal supersymmetric model (MSSM). We found that the correction to the cross section can only reach a few percent in the SM, but can be quite significant (> 10%) in the 2HDM and MSSM for favorable parameter values, which may be observable at high energy e(+)e(-) colliders.
分类: 物理学 >> 基本粒子与场物理学 提交时间: 2016-05-16
摘要: We calculate the one-loop QCD corrections to t-->(t) over tilde(1)(0)(j) using the dimensional reduction scheme, including QCD and supersymmetric QCD corrections. The analytic expressions for the corrections to the decay width are given, which can easily be extended to t-->(+)(j)(b) over tilde(i). The numerical results show that the correction amounts to more than a 10% reduction in the partial width relative to the tree level result. We also compare the corrections in the no-mixing top squark case with those in the mixing top squark case.
分类: 物理学 >> 基本粒子与场物理学 提交时间: 2016-05-16
摘要: This talk is a review of the recent studies on probing new physics through single top quark processes and probing exotic top quark decays at the upgraded Tevatron.
分类: 物理学 >> 基本粒子与场物理学 提交时间: 2016-05-16
摘要: We evaluate the supersymmetric QCD corrections to single top quark production via q (q) over bar'-->t (b) over bar at the Fermilab Tevatron in the minimal supersymmetric model. We find that within the allowed range of squark and gluino masses the supersymmetric QCD corrections can enhance the cross section by a few percent. The combined effects of SUSY QCD, SUSY EW, and the Yukawa couplings can exceed 10% for the smallest allowed tan beta(similar or equal to 0.25) but are only a few percent for tan beta>1.
分类: 物理学 >> 基本粒子与场物理学 提交时间: 2016-05-16
摘要: We evaluate the supersymmetric (SUSY) electroweak corrections to the effect of parity nonconservation in --> production at the Fermilab Tevatron predicted by the Minimal Supersymmetric Model (MSSM). We find that the parity nonconserving asymmetry from the SUSY electroweak and SUSY Yukawa loop corrections predicted by the minimal supergravity (mSUGRA) model and the MSSM models with scenarios motivated by current data is about one percent. It will be challenging to observe such a small asymmetry at the Tevatron with 10 fb(-1) of luminosity, It could however be observable if both the top- and bottom-squarks are light and tan beta is smaller than 1, though theses parameters are not favored by mSUGRA. (C) 1997 Elsevier Science B.V.