2,699 research outputs found
Study of the slepton non-universality at the CERN Large Hadron Collider
In supersymmetric theory, the sfermion-fermion-gaugino interactions conserve
the chirality of (s)fermions. The effect appears as the charge asymmetry in
distributions at the CERN Large Hadron Collider where jets and leptons
arise from the cascade decay . Furthermore, the decay branching ratios and the charge
asymmetries in distributions are flavor non-universal due to the
and mixing. When is large, the
non-universality between and becomes level. We perform a
Monte Carlo simulation for some minimal supergravity benchmark points to
demonstrate the detectability.Comment: 19 pages, 6 figures, revte
Measuring the Mass of the Lightest Chargino at the CERN LHC
Results are presented of a feasibility study of techniques for measuring the
mass of the lightest chargino at the CERN LHC. These results suggest that for
one particular mSUGRA model a statistically significant chargino signal can be
identified and the chargino mass reconstructed with a precision of order 11%
for of order 100 fb-1 of data.Comment: 6 pages, 5 figures. To appear in the proceedings of the workshop: Les
Houches 2003: Physics at TeV Scale Collider
Implications of Muon anomalous magnetic moment for Direct detection of Neutralino Dark Matter
We investigate the implications of the recent measurement of muon anomalous
magnetic moment for the direct detection of neutralino dark matter in the three
different SUSY models: mSUGRA, a model with non-universal Higgs mass, and an
SO(10) GUT model. We consider two extreme scenario for bound,
i.e. (1 bound)
and ( below). In mSUGRA model,
the counting ratio may be above the sensitivity of the future experiments when
parameters are within bound of . However, the
tends to be high compared to the currently favored value
. For models with the non-universal scalar masses, the possibility
to have the consistent and the high counting ratio is open up
in the region of parameter space where Higgsino mass is smaller than
mSUGRA prediction. In particular, in the SO(10) model, the LSP dark matter
detection rate may be enhanced by almost one order of magnitude compared to
mSUGRA and the model with non-universal Higgs mass, for cosmologically
acceptable . The highest detection rate of LSP dark matter
occurs in the region where the LSP constitutes a subdominant part of local halo
DM. Implication of SUSY mass parameter measurement under the cosmological
constraint is also discussed
Modified f(R) gravity from scalar-tensor theory and inhomogeneous EoS dark energy
The reconstruction of f(R)-gravity is showed by using an auxiliary scalar
field in the context of cosmological evolution, this development provide a way
of reconstruct the form of the function f (R) for a given evolution of the
Hubble parameter. In analogy, f(R)-gravity may be expressed by a perfect fluid
with an inhomogeneous equation of state that depends on the Hubble parameter
and its derivatives. This mathematical equivalence that may confuse about the
origin of the mechanism that produces the current acceleration, and possibly
the whole evolution of the Hubble parameter, is shown here.Comment: 8 page
Classical Trace Anomaly
We seek an analogy of the mathematical form of the alternative form of
Einstein's field equations for Lovelock's field equations. We find that the
price for this analogy is to accept the existence of the trace anomaly of the
energy-momentum tensor even in classical treatments. As an example, we take
this analogy to any generic second order Lagrangian and exactly derive the
trace anomaly relation suggested by Duff. This indicates that an intrinsic
reason for the existence of such a relation should perhaps be, classically,
somehow related to the covariance of the form of Einstein's equations.Comment: Version 2: 21 pages, TeX file (using phyzzx.tex), added new section
and references. Version 3: Just replaced Abstrac
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