66,864 research outputs found
Stretched exponential relaxation in the Coulomb glass
The relaxation of the specific heat and the entropy to their equilibrium
values is investigated numerically for the three-dimensional Coulomb glass at
very low temperatures. The long time relaxation follows a stretched exponential
function, , with the exponent increasing
with the temperature. The relaxation time follows an Arrhenius behavior
divergence when . A relation between the specific heat and the entropy
in the long time regime is found.Comment: 5 pages and 4 figure
Higgs and new physics at high energy
The observation of a new particle in the search for the Standard Model (SM)
Higgs boson at the LHC, reported by the ATLAS and CMS collaborations, is a
milestone in the quest to understand electroweak symmetry breaking. The
evidence at the level of 5 for a Higgs boson-like particle has been
published by both experiments after a preliminary analysis of the data from the
LHC Run-I. Precision measurements of the new particle are of critical
importance. This document reviews the mass and spin measurement, the couplings
scale factor measurements and the limits on new physics derived from these
results.Comment: Presented at the 2014 Flavor Physics and CP Violation (FPCP-2014),
Marseille, France, May 26-30 2014, 9 pages, 9 figure
ChPT parameters from tau-decay data
Using the updated ALEPH V-A spectral function from tau decays, we determine
the lowest spectral moments of the left-right correlator and extract dynamical
information on order parameters of the QCD chiral symmetry breaking.
Uncertainties associated with violations of quark-hadron duality are estimated
from the data, imposing all known short-distance constraints on a
resonance-based parametrization. Employing proper pinched weight functions, we
obtain an accurate determination of the effective chiral couplings L10 and C87
and the dimension-six and -eight contributions in the Operator Product
Expansion.Comment: 5 pages, 3 figures, QCD2015 Montpellie
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