Can MSSM with light sbottom and light gluino survive Z-peak constraints ?
Abstract
In the framework of minimal supersymmetric model we examine the Z-peak constraints on the scenario of one light sbottom (2--5.5 GeV) and light gluino (12--16 GeV), which has been successfully used to explain the excess of bottom quark production in hadron collision. Such a scenario is found to be severely constrained by LEP Z-peak observables, especially by R_b, due to the large effect of gluino-sbottom loops. To account for the R_b data in this scenario, the other mass eigenstate of sbottom, i.e., the heavier one, must be lighter than 125 (195) GeV at 2-sigma (3-sigma) level, which should have been produced in association with the lighter one at LEP II and will probobaly be within the reach of Tevatron Run 2.
Cite
@article{arxiv.hep-ph/0111144,
title = {Can MSSM with light sbottom and light gluino survive Z-peak constraints ?},
author = {Junjie Cao and Zhaohua Xiong and Jin Min Yang},
journal= {arXiv preprint arXiv:hep-ph/0111144},
year = {2011}
}
Comments
discussion on SUSY-EW effects added, to appear in PRL