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Soft Supersymmetry Breaking, Scalar Top-Charm Mixing and Higgs Signatures
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hep-ph/0103178
Soft Supersymmetry Breaking, Scalar Top-Charm Mixing and Higgs Signatures
J. L. Diaz-Cruz a, Hong-Jian He b, C.–P. Yuan c
a Lawrence Berkeley National Laboratory, Berkeley, California 92710, USA
b The University of Texas at Austin, Austin, Texas 78712, USA
c Michigan State University, East Lansing, Michigan 48824, USA
Abstract
The squark mass-matrix from the soft supersymmetry (SUSY) breaking sector contains a rich
flavor-mixing structure that allows O(1) mixings among top- and charm-squarks while being
consistent with all the existing theoretical and experimental bounds. We formulate a minimal
flavor-changing-neutral current scheme in which the squark mixings arise from the non-diagonal
scalar trilinear interactions. This feature can be realized in a class of new models with a horizontal
U(1)H symmetry which generates realistic quark-mass matrices and provides a solution to the
SUSY μ-problem. Finally, without using the mass-insertion approximation, we analyze SUSY
radiative corrections to the H±bc and h0tc couplings, and show that these couplings can reveal
exciting new discovery channels for the Higgs boson signals at the Tevatron and the LHC.
PACS numbers: 12.60.-i, 12.15.-y, 11.15.Ex
1. Introduction
Weak-scale supersymmetry (SUSY) [1], as a leading candidate for new physics beyond the stan-
dard model (SM), sensibly explains electroweak symmetry breaking, but leaves the understanding
of flavor sector as a major challenge. Being a new fundamental space-time symmetry between
fermions and bosons, SUSY necessarily extends the SM flavor structure to include superpartners
for all fermions and thus adds further puzzles to the flavor physics. To be consistent with the
experimental data, supersymmetry has to be broken. The breaking of the SUSY lifts the mass
spectrum of the superpartners and is parametrized by the soft-breaking Lagrangian of the Minimal
Supersymmetric SM (MSSM) with a large
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