4,243 research outputs found
The Higgs masses and explicit CP violation in the gluino-axion model
In this work, we adress the phenomenological consequences of explicit CP
violation on direct Higgs-boson searches at high energy colliders. Having a
restricted parameter space, we concentrate on the recently proposed
gluino-axion model, and investigate the CP violation capability of the model
subject to the recent experimental data. It is shown that the Higgs masses as
well as their CP compositions are quite sensitive to the supersymmetric CP
phases. The lightest Higgs is found to be nearly CP even to a good
approximation whilst the remaining two heavy scalars do not have definite CP
parities.Comment: 20 pp, 14 eps figs, title is changed, the manuscript is improved
using the latest experimental data, some figures and references adde
Realistic Gluino Axion Model Consistent with Supersymmetry Breaking at the TeV Scale
The recently proposed model of using the dynamical phase of the gluino to
solve the strong CP problem is shown to admit a specific realization in terms
of fundamental singlet superfields, such that the breaking of supersymmetry
occurs only at the TeV scale, despite the large axion scale of 10^{9} to
10^{12} GeV. Phenomenological implications are discussed.Comment: 12 pp, 2 fig
On the Sources of CP-violation Contributing to the Electric Dipole Moments
In the framework of seesaw mechanism embedded in the constrained Minimal
Supersymmetric Standard Model (cMSSM), phases of neutrino Yukawa coupling,
-term and -terms can all contribute to the Electric Dipole Moment (EDM)
of the electron. We discuss and classify the situations for which by combined
analysis of the upcoming results on , and
discriminating between these sources will be possible.Comment: 6 pages, 4 figures, talk presented at IPM-LHP06, Tehran, Ira
e^+e^-\to (h A)\to bbbb in Abelian Extended Supersymmetric Standard Model
We discuss the cross section in an Abelian
extended SM. We work in that minimum of the scalar potential for which Higgs
trilier coupling is greater than the soft mass parameters. We find that
nex-to-lightest Higgs gives the essential contribution to the cross section in
the small mixing angle and leptophobic limit.Comment: 13 pages, 1 postscript figur
One-Loop Effects in Supergravity Models with an Additional U(1)
For an Abelian extended Supergravity model, we investigate some important low
energy parameters: \tan\beta, Z-Z' mixing angle, lightest CP-even Higgs mass
bound, Z' mass, and effective \mu parameter. By integrating the RGE's from
string scale down to the weak scale we constuct the scalar potential, and
analyze the quantities above at the tree- and one-loop levels by including the
contributions of top squarks and top quark in the effective potential. PACS:
04.65.+e, 12.60.JvComment: 16 pages, 6 postscript figure
Neutrino Masses and the Gluino Axion Model
We extend the recently proposed gluino axion model to include neutrino
masses. We discuss how the canonical seesaw model and the Higgs triplet model
may be realized in this framework. In the former case, the heavy singlet
neutrinos are contained in superfields which do not have any vacuum expectation
value, whereas the gluino axion is contained in one which does. We also
construct a specific renormalizable model which realizes the mass scale
relationship , where is the axion decay constant
and is a large effective mass parameter.Comment: 8 pages, no figur
The effect of supersymmetric CP phases on Chargino-Pair Production via Drell-Yan Process at the LHC
We compute the rates for pp annihilation into chargino-pairs via Drell-Yan
process taking into account the effects of supersymmetric soft phases, at
proton-proton collider. In particular, the phase of the mu parameter gains
direct accessibility via the production of dissimilar charginos. The phases of
the trilinear soft masses do not have a significant effect on the cross
sections.Comment: 24 pages, 7 figure
Q-ball formation in the MSSM with explicit CP violation
Q-balls generically exist in the supersymmetric extensions of the standard
model. Taking into account the additional sources of CP violation, which are
naturally accomodated by the supersymmetric models, it is shown that the Q-ball
matter depends additively on individual CP phases, whereas mass per unit charge
in the Q-ball depends only on the relative phases. There are regions of the
parameter space where there is no stable Q-ball solution in the CP-conserving
limit whereas finite CP phases induce a stable Q-ball.Comment: 6 p
Dirac-Weyl equation on a hyperbolic graphene surface under perpendicular magnetic fields
In this paper the Dirac-Weyl equation on a hyperbolic surface of graphene under magnetic fields is considered. In order to solve this equation analytically for some
cases, we will deal with vector potentials symmetric under rotations around the z axis. Instead of using tetrads we will get this equation from a more intuitive point of view by restriction from the Dirac-Weyl equation of an ambient space. The eigenvalues and corresponding eigenfunctions for some magnetic fields are found by means of the factorization method. The existence of a zero energy ground level and its degeneracy is also analysed in relation to the Aharonov-Casher theorem valid for
at graphene
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