943 research outputs found
Higgs and SUSY Higgs bosons at future linear collider
Theoretical overview on phenomenology of Higgs boson and SUSY Higgs boson at
a future linear collider experiment is given as a Higgs and SUSY Higgs working
group summary report for LCWS 2000.Comment: 14 page, 4 figures, Talk given at Linear Collider Workshop 2000,
October 24 -28, 2000, Fermila
Manifestaion of SUSY in B decays
SUSY effects on various flavor changing neutral current processes are
discussed in the minimal supergravity model and the SU(5) grand unified theory
with right-handed neutrino supermultiplets. In particular, in the latter case
the neutrino Yukawa coupling constants can be a source of the flavor mixing in
the right-handed-down-type-squark sector. It is shown that due to this mixing
the time-dependent CP asymmetry of radiative B decay can be as large as 30% and
the ratio of - mixing and - mixing deviates
from the prediction in the standard model and the minimal supergravity model
without the neutrino interaction.Comment: 7 pages, 2 figures, talk given at the Third International Conference
on B Physics and CP Violation, December 3 -7, 1999, Taipe
Cancellation Mechanism of FCNCs in S_4 x Z_2 Flavor Symmetric Extra U(1) Model
We propose a E_6 inspired supersymmetric model with a non-Abelian discrete
flavor symmetry; SU(3)_c x SU(2)_W x U(1)_Y x U(1)_X x S_4 x Z_2. In our
scenario, the additional abelian gauge symmetry; U(1)_X, not only solves the
mu-problem in the minimal Supersymmetric Standard Model(MSSM), but also
requires new exotic fields which play an important role in solving flavor
puzzles. If our exotic quarks can be embedded into a S_4 triplet, which
corresponds to the number of the generation, one finds that dangerous proton
decay can be well-suppressed. Hence, it might be expected that the generation
structure for lepton and quark in the SM(Standard Model) can be understood as a
new system in order to stabilize the proton in a supersymemtric standard model
(SUSY). Moreover, due to the nature of the discrete non-Abelian symmetry
itself, Yukawa coupling constants of our model are drastically reduced. In our
previous work, we actually have found much success. However, we also have to
solve Higgs mediated FCNC at tree level, as is often the case with such
extended Higgs models. In this paper, we propose a promising mechanism which
could make cancellation between Higgs and SUSY contributions.Comment: 19 pages, 2 tables, no figures. Title is slightly changed and minor
parts are modifie
Extracting SUSY Parameters from the Higgs Boson Properties
We calculate the ratio of the two branching ratios, Br(h -> bb-bar) and Br(h
-> cc-bar) + Br(h -> gg), in the minimal supersymmetric standard model taking
into account the SUSY-loop corrections to the Higgs sector and the hbb-bar
vertex. We show that the heavy Higgs mass can be extracted from the ratio,
almost independently of other SUSY parameters, in the region of tan(beta) ~<
10.Comment: Talk given by S.Kiyoura at the Linear Collider Workshop 2000, October
24-28, 2000, Fermila
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