63,657 research outputs found
Mesons and Nucleons in Soft-Wall AdS/QCD
We study further the soft-wall AdS/QCD model with a cubic potential for the
bulk scalar. We analyze the spectra of pseudoscalar, scalar, vector and
axial-vector mesons. We also study the spin-1/2 nucleon spectrum and the
pion-nucleon coupling. All of them have a good agreement with the experimental
data.Comment: 17 pages. v2: references added, minor improvement, to appear in PR
Dilepton Production at Fermilab and RHIC
Some recent results from several fixed-target dimuon production experiments
at Fermilab are presented. In particular, we discuss the use of Drell-Yan data
to determine the flavor structure of the nucleon sea, as well as to deduce the
energy-loss of partons traversing nuclear medium. Future dilepton experiments
at RHIC could shed more light on the flavor asymmetry and possible
charge-symmetry-violation of the nucleon sea. Clear evidence for scaling
violation in the Drell-Yan process could also be revealed at RHIC.Comment: 5 pages, talk presented at the RIKEN-BNL Workshop on 'Hard Parton
Physics in Nucleus-Nucleus collisions, March 199
Strong laws of large numbers for sub-linear expectations
We investigate three kinds of strong laws of large numbers for capacities
with a new notion of independently and identically distributed (IID) random
variables for sub-linear expectations initiated by Peng. It turns out that
these theorems are natural and fairly neat extensions of the classical
Kolmogorov's strong law of large numbers to the case where probability measures
are no longer additive. An important feature of these strong laws of large
numbers is to provide a frequentist perspective on capacities.Comment: 10 page
Temperature-dependent Raman scattering of KTa1-xNbxO3 thin films
We report a Raman scattering investigation of KTa1-xNbxO3 (x = 0.35, 0.5)
thin films deposited on MgO and LaAlO3 as a function of temperature. The
observed phase sequence in the range from 90 K to 720 K is similar to the
structural phase transitions of the end-member material KNbO3. Although similar
in the phase sequence, the actual temperatures observed for phase transition
temperatures are significantly different from those observed in the literature
for bulk samples. Namely, the tetragonal (ferroelectric) to cubic
(paraelectric) phase transition is up to 50 K higher in the films when compared
to bulk samples. This enhanced ferroelectricity is attributed to biaxial strain
in the investigated thin films
Erratum : Squeezing and entanglement delay using slow light
An inconsistency was found in the equations used to calculate the variance of
the quadrature fluctuations of a field propagating through a medium
demonstrating electromagnetically induced transparency (EIT). The decoherence
term used in our original paper introduces inconsistency under weak probe
approximation. In this erratum we give the Bloch equations with the correct
dephasing terms. The conclusions of the original paper remain the same. Both
entanglement and squeezing can be delayed and preserved using EIT without
adding noise when the decoherence rate is small.Comment: 1 page, no figur
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