75,732 research outputs found
125 GeV Higgs as a pseudo-Goldstone boson in supersymmetry with vector-like matters
We propose a possibility of the 125 GeV Higgs being a pseudo-Goldstone boson
in supersymmetry with extra vector-like fermions. Higgs mass is obtained from
loops of top quark and vector-like fermions from the global symmetry breaking
scale f at around TeV. The mu, Bmu/mu \sim f are generated from the dynamics of
global symmetry breaking and the Higgs quartic coupling vanishes at f as tan
beta \simeq 1. The relation of msoft \sim with f \sim mu \sim m_soft
\sim TeV is obtained and large mu does not cause a fine tuning for the
electroweak symmetry breaking. The Higgs to di-photon rate can be enhanced from
the loop of uncolored vector-like matters. The stability problem of Higgs
potential with vector-like fermions can be nicely cured by the UV completion
with the Goldstone picture.Comment: 28 pages, 8 figure
Quark-Antiquark-Gluon Jets in DIS Diffractive Dissociation
We study the diffractive production of jets with large transverse
momenta in the region of large diffractive masses (small ). Cross
sections for transverse and longitudinal photons are obtained in the leading
log 1/x_{\fP} and log approximation, keeping all powers in log
. We perform a numerical study and illustrate the angular
distribution of the three jets. We also estimate the integrated diffractive
three jet cross section and compare with the dijet cross section obtained
before.Comment: 28 pages (Latex), 20 figures (Postscript
Well-Ordered Philosophy? Reflections on Kitcher's Proposal for a Renewal of Philosophy.
In his recent article Philosophy Inside Out, Philip Kitcher presents a metaphilosophical outlook that aims at nothing less than a renewal of philosophy. His idea is to draw philosophers’ attention away from “timeless questions” in the so-called “core areas” of philosophy. Instead, philosophers should address questions that matter to human lives. The aim of this paper is twofold: first, to reconstruct Kitcher’s view of how philosophy should be renewed; second, to point out some difficulties relating to his position. These difficulties concern the integration of his naturalism into the pragmatic vision of philosophy, the role of putative philosophical experts, and the ideal status of the program of well-ordered inquiry
Oscillatory convection in binary mixtures: thermodiffusion, solutal buoyancy, and advection
The role of thermodiffusive generation of concentration fluctuations via the
Soret effect, their contribution to the buoyancy forces that drive convection,
the advective mixing effect of the latter, and the diffusive homogenisation are
compared and elucidated for oscillatory convection. Numerically obtained
solutions of the field equations in the form of spatially extended relaxed
traveling waves, of standing waves, and of the transient growth of standing
waves and their transition to traveling waves are discussed as well as
spatially localized convective states of traveling waves that are surrounded by
the quiescent fluid.Comment: 30 pages, 10 figure
A kT-dependent sea-quark density for the CASCADE Monte Carlo event generator
Parton-shower event generators that go beyond the collinear-ordering
approximation at small x have so far included only gluon and valence quark
channels at transverse momentum dependent level. We describe results of recent
work to include effects of the sea-quark distribution with explicit dependence
on the transverse quark-momentum.This sea-quark density is then applied to the
description of forward Z -production. The qq*->Z matrix element (with one
off-shell quark) is calculated in an explicit gauge invariant way, making use
of high energy factorization. The kT-factorized result has been implemented
into the CCFM Monte-Carlo CASCADE and a numerical comparison with the qg*->Zq
matrix element has been carried out.Comment: 4 pages, 4 figures, based on a talk given at the XXI Workshop on
Deep-Inelastic Scattering and Related Subjects, 11-15 April, Newport News,
Virginia (2011
Semiclassical approach to Bose-Einstein condensates in a triple well potential
We present a new approach for the analysis of Bose-Einstein condensates in a
few mode approximation. This method has already been used to successfully
analyze the vibrational modes in various molecular systems and offers a new
perspective on the dynamics in many particle bosonic systems. We discuss a
system consisting of a Bose-Einstein condensate in a triple well potential.
Such systems correspond to classical Hamiltonian systems with three degrees of
freedom. The semiclassical approach allows a simple visualization of the
eigenstates of the quantum system referring to the underlying classical
dynamics. From this classification we can read off the dynamical properties of
the eigenstates such as particle exchange between the wells and entanglement
without further calculations. In addition, this approach offers new insights
into the validity of the mean-field description of the many particle system by
the Gross-Pitaevskii equation, since we make use of exactly this correspondence
in our semiclassical analysis. We choose a three mode system in order to
visualize it easily and, moreover, to have a sufficiently interesting
structure, although the method can also be extended to higher dimensional
systems.Comment: 15 pages, 15 figure
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