Soft SUSY Breaking, Stop-Scharm Mixing and Higgs Signatures
J. Lorenzo Díaz-Cruz, Hong-Jian He, C.–P. Yuan · arXiv (Cornell University) · 2001
The three-family squark mass-matrix from MSSM soft breaking contains a rich flavor-mixing structure. We formulate the {\\it minimal} FCNC schemes for the squark mass-terms and scalar trilinear interactions consistent with existing precision data and charge-color breaking plus stability bounds, and find O(1) mixings among top- and charm-squarks are allowed. We demonstrate that this feature can be naturally realized in a class of new models with horizontal U(1)_H symmetry which also solves the SUSY \\mu-problem. Then, we analyze SUSY radiative corrections to H^+-b-c and h^0-t-c vertices without using mass-insertion approximation and show that the loop-induced flavor-mixing couplings can be significant to provide new discovery Higgs signatures at Tevatron and LHC.