1,181 research outputs found
The non-Abelian feature of parton energy loss in energy dependence of jet quenching in high-energy heavy-ion collisions
One of the non-Abelian features of parton energy loss is the ratio between gluon and quark jets. Since jet production rate is
dominated by quark jets at high and by gluon jets at low
, high hadron suppression in high-energy heavy-ion collisions should
reflect such a non-Abelian feature. Within a leading order perturbative QCD
parton model that incorporates transverse expansion and Woods-Saxon nuclear
distribution, the energy dependence of large GeV/ hadron
suppression is found to be sensitive to the non-Abelian feasture of parton
energy loss and could be tested by data from low energy runs at RHIC or data
from LHC.Comment: RevTex 4, 7 pages, 3 figure
Energy average formula of photon gas rederived by using the generalized Hermann-Feynman theorem
By virtue of the generalized Hermann-Feynmam theorem and the method of
characteristics we rederive energy average formula of photon gas, this is
another useful application of the theorem.Comment: 2 page
J/Psi Suppression in an Equilibrating Parton Plasma
Short-distance QCD is employed to calculate the survival probability
in an equilibrating parton gas, whose evolution is governed by a set of master
rate equations. Partons in the early stage of high-energy nuclear collisions
may initially not be in equilibrium, but their average transverse momentum is
sufficiently high to break up a bound state. Such a break-up during
the evolution of the parton gas is shown to cause a substantial
suppression at both RHIC and LHC energies, using realistic estimates of the
initial parton densities. The transverse momentum dependence of the suppression
is also shown to be sensitive to the initial conditions and the evolution
history of the parton plasma.Comment: 13 pages in RevTex, 5 uuencoded postscript figures include
Do Search for Dibaryonic De - Excitations in Relativistic Nuclear Reactions
Some odd characteristics are observed in the single particle distributions
obtained from interactions at momenta which are
explained as the manifestation of a new mechanism of strangeness production via
dibaryonic de-excitations. A signature of the formation of hadronic and
baryonic clusters is also reported. The di-pionic signals of the dibaryonic
orbital de-excitations are analyzed in the frame of the MIT - bag Model and a
Monte Carlo simulation.The role played by the dibaryonic resonances in
relativistic nuclear collisions could be a significant one.
Key words: Relativistic nuclear interactions negative pions, negative kaons,
di-pions , streamer chamber, dibaryons, MIT - bag model
PACS codes: 25.75.+r,14.40.Aq,14.20.Pt,12.40.AsComment: 17 pages,LATEX, preprint ICTP -243 1993,figures available by reques
A NLO analysis on fragility of dihadron tomography in high energy collisions
The dihadron spectra in high energy collisions are studied within the
NLO pQCD parton model with jet quenching taken into account. The high
dihadron spectra are found to be contributed not only by jet pairs close and
tangential to the surface of the dense matter but also by punching-through jets
survived at the center while the single hadron high spectra are only
dominated by surface emission. Consequently, the suppression factor of such
high- hadron pairs is found to be more sensitive to the initial gluon
density than the single hadron suppression factor.Comment: 4 pages, 4 figures, proceedings for the 19th international Conference
on ultra-relativistic nucleus-nucleus collisions (QM2006), Shanghai, China,
November 14-20, 200
Hamiltonian formalism of the DNLS equation with nonvanished boundary value
Hamiltonian formalism of the DNLS equation with nonvanishing boundary value
is developed by the standard procedure.Comment: 11 page
Strangeness Enhancement in and Interactions at SPS Energies
The systematics of strangeness enhancement is calculated using the HIJING and
VENUS models and compared to recent data on , and
collisions at CERN/SPS energies (). The HIJING model is used to
perform a {\em linear} extrapolation from to . VENUS is used to
estimate the effects of final state cascading and possible non-conventional
production mechanisms. This comparison shows that the large enhancement of
strangeness observed in collisions, interpreted previously as possible
evidence for quark-gluon plasma formation, has its origins in non-equilibrium
dynamics of few nucleon systems. % Strangeness enhancement %is therefore traced
back to the change in the production dynamics %from to minimum bias
and central collisions. A factor of two enhancement of at
mid-rapidity is indicated by recent data, where on the average {\em one}
projectile nucleon interacts with only {\em two} target nucleons. There appears
to be another factor of two enhancement in the light ion reaction relative
to , when on the average only two projectile nucleons interact with two
target ones.Comment: 29 pages, 8 figures in uuencoded postscript fil
Differentiable VQ-VAE's for Robust White Matter Streamline Encodings
Given the complex geometry of white matter streamlines, Autoencoders have
been proposed as a dimension-reduction tool to simplify the analysis
streamlines in a low-dimensional latent spaces. However, despite these recent
successes, the majority of encoder architectures only perform dimension
reduction on single streamlines as opposed to a full bundle of streamlines.
This is a severe limitation of the encoder architecture that completely
disregards the global geometric structure of streamlines at the expense of
individual fibers. Moreover, the latent space may not be well structured which
leads to doubt into their interpretability. In this paper we propose a novel
Differentiable Vector Quantized Variational Autoencoder, which are engineered
to ingest entire bundles of streamlines as single data-point and provides
reliable trustworthy encodings that can then be later used to analyze
streamlines in the latent space. Comparisons with several state of the art
Autoencoders demonstrate superior performance in both encoding and synthesis.Comment: 5 pages, 4 figures, 1 tabl
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