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Supersymmetric electroweak corrections to single top quark production at the Fermilab Tevatron

Li, CS; Oakes, RJ; Yang, JM; Zhou, HYSubjects: Physics >> The Physics of Elementary Particles and Fields

We calculate the O(alpha(cw)M(t)(2)/M-W(2)) supersymmetric (SUSY) electroweak corrections to single top quark production via --> |

One-loop QCD corrections to top quark decay into a neutralino and light stop squark

Li, CS; Oakes, RJ; Yang, JM; Zhou, HYSubjects: Physics >> The Physics of Elementary Particles and Fields

We calculate the one-loop QCD corrections to t-->(t) over tilde(1)<(chi)over tilde>(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--><(chi)over tilde>(+)(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. |

Top quark at the upgraded Tevatron to probe new physics

Datta, A?; Hosch, M; Li, CS; Oakes, RJ; Whisnant, K; Young, BL; Zhang, XSubjects: Physics >> The Physics of Elementary Particles and Fields

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. |

Supersymmetric QCD corrections to single top quark production at the Fermilab tevatron

Li, CS; Oakes, RJ; Yang, JM; Zhou, HYSubjects: Physics >> The Physics of Elementary Particles and Fields

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. |

Subjects: Physics >> The Physics of Elementary Particles and Fields

We evaluate the supersymmetric (SUSY) electroweak corrections to the effect of parity nonconservation in --> |

Subjects: Physics >> The Physics of Elementary Particles and Fields

If all the supersymmetry particles (sparticles) except a light Higgs boson are too heavy to be directly produced at the Large Hadron Collider and Tevatron, a possible way to reveal evidence for supersymmetry is through their virtual effects in other processes. We examine such supersymmetric QCD effects in bottom pair production associated with a light Higgs boson at the Large Hadron Collider and Tevatron. We find that if the relevant sparticles (gluinos and squarks) are well above the TeV scale, too heavy to be directly produced, they can still have sizable virtual effects in this process. For large tan beta, such residual effects can alter the production rate by as much as 40%, which should be observable in future measurements of this process. |

Subjects: Physics >> The Physics of Elementary Particles and Fields

The Higgs boson production pp(p (p) over bar)-->bh+X via bg-->bh at hadron colliders, which may be an important channel for testing the bottom quark Yukawa coupling, is subject to large supersymmetric quantum corrections. In this work the one-loop supersymmetric (SUSY) QCD corrections to this process are evaluated and are found to be quite sizable in some parameter space. We also study the behavior of the corrections in the limit of heavy SUSY masses and find the remnant effects of SUSY QCD. These remnant effects, which are left over in the Higgs sector by the heavy sparticles, are found to be so sizable (for a light CP-odd Higgs boson and large tan beta) that they might be observable in future experiments. The exploration of such remnant effects is important for probing SUSY, especially in the case that the sparticles are too heavy (above TeV) to be directly discovered in future experiments. |

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