4,069,035 research outputs found
Perturbative Confinement
A Procedure is outlined that may be used as a starting point for a
perturbative treatment of theories with permanent confinement. By using a
counter term in the Lagrangian that renormalizes the infrared divergence in the
Coulomb potential, it is achieved that the perturbation expansion at a finite
value of the strong coupling constant may yield reasonably accurate properties
of hadrons, and an expression for the string constant as a function of the QCD
Lambda parameter.Comment: Presented at QCD'02, Montpellier, July 2002. 12 pages LaTeX, 8
Figures PostScript, uses gthstyle.sty Reprt-no: ITF-2002/39; SPIN-2002/2
Exact one-loop results for in 3-3-1 models
We investigate the decays , with
in a general class of 3-3-1 models with heavy exotic leptons with arbitrary
electric charges. We present full and exact analytical results keeping external
lepton masses. As a by product, we perform numerical comparisons between exact
results and approximate ones where the external lepton masses are neglected. As
expected, we found that branching fractions can reach the current experimental
limits if mixings and mass differences of the exotic leptons are large enough.
We also found unexpectedly that, depending on the parameter values, there can
be huge destructive interference between the gauge and Higgs contributions when
the gauge bosons connecting the Standard Model leptons to the exotic leptons
are light enough. This mechanism should be taken into account when using
experimental constraints on the branching fractions to exclude the parameter
space of the model.Comment: 27 pages, 5 figures, 4 tables; additional explanation on input
parameters; matches journal versio
Computer-aided design of large-scale integrated circuits - A concept
Circuit design and mask development sequence are improved by using general purpose computer with interactive graphics capability establishing efficient two way communications link between design engineer and system. Interactive graphics capability places design engineer in direct control of circuit development
Remote Inflation: Hybrid-like inflation without hybrid-type potential
A new scenario of hybrid-like inflation is considered without using
hybrid-type potential. Radiation raised continuously by a dissipating inflaton
field keeps symmetry restoration in a remote sector, and the false-vacuum
energy of the remote sector dominates the energy density during inflation.
Remote inflation is terminated when the temperature reaches the critical
temperature, or when the slow-roll condition is violated. Without introducing a
complex form of couplings, inflaton field may either roll-in (like a standard
hybrid inflation) or roll-out (like an inverted-hybrid model or quintessential
inflation) on arbitrary inflaton potential. Significant signatures of remote
inflation can be observed in the spectrum caused by (1) the inhomogeneous phase
transition in the remote sector, or (2) a successive phase transition in the
remote sector. Remote inflation can predict strong amplification or suppression
of small-scale perturbations without introducing multiple inflation. Since the
inflaton may have a run-away potential, it is also possible to identify the
inflaton with quintessence, without introducing additional mechanisms. Even if
the false-vacuum energy is not dominated by the remote sector, the phase
transition in the remote sector is possible during warm inflation, which may
cause significant amplification/suppression of the curvature perturbations.Comment: 28 pages, 1 figure, fixed references, accepted for publication in
JCA
Update on the Pyramid Scheme
We summarize recent work in which we attempt to make a consistent model of
LHC physics, from the Pyramid Scheme. The models share much with the NMSSM, in
particular, enhanced tree level contributions to the Higgs mass and a
preference for small tan {\beta}. There are 3 different singlet fields, and a
new strongly coupled gauge theory, so the constraints of perturbative
unification are quite different. We outline our general approach to the model,
which contains a Kahler potential for three of the low energy fields, which is
hard to calculate. Detailed calculations, based on approximations to the Kahler
potential, will be presented in a future publication.Comment: LaTeX 2e/ 9 page
New identities involving q-Euler polynomials of higher order
In this paper we give new identities involving q-Euler polynomials of higher
order.Comment: 11 page
Nuclear force in Lattice QCD
We perform the quenched lattice QCD analysis on the nuclear force
(baryon-baryon interactions). We employ lattice at
( fm) with the standard gauge action and the Wilson quark action
with the hopping parameters , and generate about
200 gauge configurations. We measure the temporal correlators of the two-baryon
system which consists of heavy-light-light quarks. We extract the inter-baryon
force as a function of the relative distance . We also evaluate the
contribution to the nuclear force from each ``Feynman diagram'' such as the
quark-exchange diagram individually, and single out the roles of Pauli-blocking
effects or quark exchanges in the inter-baryon interactions.Comment: Presented at Particles and Nuclei International Conference (PANIC05),
Santa Fe, NM, Oct. 24-28, 2005; 3 pages, 2figure
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