4,399 research outputs found
Generation Mixing of Sneutrinos in Heavier Chargino Decay
The heavier chargino decay could yield two charged leptons of different
generations, owing to generation mixing of sneutrinos. We discuss the
possibility of producing and through this process in near future
collider experiments. The analyses are made systematically in the
supersymmetric extension of the standard model without assuming a specific
scenario for the mixing. Production of the heavier chargino is evaluated in
collisions. In the parameter region consistent with nonobservation of
the radiative decay, sizable parts lead to a detectable branching ratio
for the generation-changing decay of the heavier chargino.Comment: 22 pages, Revtex, 7 figures. v2: For the total width of the heavier
chargino, the contribution from the decay into a charged slepton and a
neutirno has been included. The figures (Figs. 2, 3, 4, 5), the equations and
the related descriptions in sections II and III have been revised. Several
references and equations added. v3: Several sentences of section I and V have
been rewritten, conclusions unchange
Low Energy Dynamics of Monopoles in Supersymmetric Yang-Mills Theories with Hypermultiplets
We derive the low energy dynamics of monopoles and dyons in N=2
supersymmetric Yang-Mills theories with hypermultiplets in arbitrary
representations by utilizing a collective coordinate expansion. We consider the
most general case that Higgs fields both in the vector multiplet and in the
hypermultiplets have nonzero vacuum expectation values. The resulting theory is
a supersymmetric quantum mechanics which has been obtained by a nontrivial
dimensional reduction of two-dimensional (4,0) supersymmetric sigma models with
potentials.Comment: 17pages, LaTeX, minor changes, references added, version published in
JHE
Soliton solutions of Calogero model in harmonic potential
A classical Calogero model in an external harmonic potential is known to be
integrable for any number of particles. We consider here reductions which play
a role of "soliton" solutions of the model. We obtain these solutions both for
the model with finite number of particles and in a hydrodynamic limit. In the
latter limit the model is described by hydrodynamic equations on continuous
density and velocity fields. Soliton solutions in this case are finite
dimensional reductions of the hydrodynamic model and describe the propagation
of lumps of density and velocity in the nontrivial background.Comment: 25 pages, 2 figure
The impact of QCD plasma instabilities on bottom-up thermalization
QCD plasma instabilities, caused by an anisotropic momentum distributions of
the particles in the plasma, are likely to play an important role in
thermalization in heavy ion collisions. We consider plasmas with two different
components of particles, one strongly anisotropic and one isotropic or nearly
isotropic. The isotropic component does not eliminate instabilities but it
decreases their growth rates. We investigate the impact of plasma instabilities
on the first stage of the ``bottom-up'' thermalization scenario in which such a
two-component plasma emerges, and find that even in the case of non-abelian
saturation instabilities qualitatively change the bottom-up picture.Comment: 12 pages, latex, one typo corrected, several minor changes in the
abstract and the text, to appear in JHE
Different Scenarios for Critical Glassy Dynamics
We study the role of different terms in the -body potential of glass
forming systems on the critical dynamics near the glass transition. Using a
simplified spin model with quenched disorder, where the different terms of the
real -body potential are mapped into multi-spin interactions, we identified
three possible scenarios. For each scenario we introduce a ``minimal'' model
representative of the critical glassy dynamics near, both above and below, the
critical transition lin e. For each ``minimal'' model we discuss the low
temperature equilibrium dynamics.Comment: Completely revised version, 8 pages, 5 figures, typeset using
EURO-LaTeX, Europhysics Letters (in press
Primordial Entropy Production and Lambda-driven Inflation from Quantum Einstein Gravity
We review recent work on renormalization group (RG) improved cosmologies
based upon a RG trajectory of Quantum Einstein Gravity (QEG) with realistic
parameter values. In particular we argue that QEG effects can account for the
entire entropy of the present Universe in the massless sector and give rise to
a phase of inflationary expansion. This phase is a pure quantum effect and
requires no classical inflaton field.Comment: 12 pages, 4 figures, IGCG-07 Pun
Electrical transport properties of bulk MgB2 materials synthesized by the electrolysis on fused mixtures of MgCl2, NaCl, KCl and MgB2O4
Electrolysis was carried out on fused mixtures of MgCl2, NaCl, KCl and MgB2O4
under an Ar flow at 600C. Electrical resistivity measurements for the grown
deposits show an onset of superconducting transition at 37 K in the absence of
applied magnetic field. The resistivity decreases down to zero below 32 K. From
an applied-field dependence of resistivity, an upper critical field and a
coherence length were calculated to be 9.7 T and 5.9 nm at 0 K, respectively
Constraints on SUSY Lepton Flavour Violation by rare processes
We study the constraints on flavour violating terms in low energy SUSY coming
from several processes as li -> lj gamma, li -> lj lj lj and mu -> e in Nuclei.
We show that a combined analysis of the processes allows us to extract
additional information with respect to an individual analysis of all the
processes. In particular, it makes possible to put bounds on sectors previously
unconstrained by li -> lj gamma. We perform the analysis both in the mass
eigenstate and in the mass insertion approximations clarifying the limit of
applicability of these approximations.Comment: 23 pages, 15 figures. Typos corrected, several references and
equations added. Results and conclusions completely unchanged. Accepted
version for publication in JHE
The scalars from the topcolor scenario and the spin correlations of the top pair production at the LHC
The topcolor scenario predicts the existences of some new scalars. In this
paper, we consider the contributions of these new particles to the observables,
which are related to the top quark pair () production at the LHC. It
is found that these new particles can generate significant corrections to the
production cross section and the spin correlations.Comment: 23 pages, 4 figures; discussions and references added; agrees with
published versio
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