1,218 research outputs found
Monte Carlo model for nuclear collisions from SPS to LHC energies
A Monte Carlo model to simulate nuclear collisions in the energy range going
from SPS to LHC, is presented. The model includes in its initial stage both
soft and semihard components, which lead to the formation of color strings.
Collectivity is taken into account considering the possibility of strings in
color representations higher than triplet or antitriplet, by means of string
fusion. String breaking leads to the production of secondaries. At this point,
the model can be used as initial condition for further evolution by a transport
model. In order to tune the parameters and see the results in nucleus-nucleus
collisions, a naif model for rescattering of secondaries is introduced. Results
of the model are compared with experimental data, and predictions for RHIC and
LHC are shown.Comment: LaTeX, 48 pages, 6 tables, 15 postscript figures included using
epsfi
J/psi suppression at SPS and RHIC in the comovers approach
The NA50 collaboration data on the suppression are compared with the
results obtained in a comovers approach based on the Dual Parton Model (DPM).
Predictions for the suppression versus the charged multiplicity -
measured in the rapidity region of the dimuon trigger - are given for SPS and
RHIC energies.Comment: 4 pages, contribution to QM200
Medium-induced multi-photon radiation
We study the spectrum of multi-photon radiation off a fast quark in medium in
the BDMPS/ASW approach. We reproduce the medium-induced one-photon radiation
spectrum in dipole approximation, and go on to calculate the two-photon
radiation in the Moli\`{e}re limit. We find that in this limit the LPM effect
holds for medium-induced two-photon ladder emission.Comment: 5 pages, 1 figure. Proceedings of Hot Quarks 2010, La Londe Les
Maures, Franc
Measurement of heavy-flavour decay muon production at forward rapidity in pp and Pb-Pb collisions at sqrt(s_NN)=2.76 TeV with the ALICE experiment
The ALICE experiment measured the heavy-flavour production in the semi-muonic
decay channel at forward rapidities () in pp and Pb--Pb collisions at
TeV. We report on the first results on the -differential cross-sections in pp collisions as well as on the nuclear
modification factors as a function of the transverse momentum and centrality.Comment: 4 pages, 3 figures, Proceedings of parallel talk at the 5th
international conference on hard and electromagnetic probes of high-energy
nuclear collisions (Hard Probes 2012), Cagliari, Ital
Anomalous suppression of production at large transverse momentum in Au + Au and d + Au collisions at 200 GeV
We propose a model of suppression of large -pions in heavy ion
collisions based on the interaction of the large pion with the dense
medium created in the collision. The model is practically the same as the one
previously introduced to describe suppression. Both the and the
centrality dependence of the data are reproduced. In deuteron-gold collisions,
the effect of the final state interaction with the dense medium turns out to be
negligibly small. Here the main features of the data are also reproduced both
at mid and at forward rapidities.Comment: 20 pages, latex, 3 postscript figures. Last version, to be published
in EJP
Extreme values in SIR epidemic models with two strains and cross-immunity
The paper explores the dynamics of extreme values in an SIR (susceptible â infectious â removed) epidemic model with two strains of a disease. The strains are assumed to be perfectly distinguishable, instantly diagnosed and each strain of the disease confers immunity against the second strain, thus showing total cross-immunity. The aim is to derive the joint probability distribution of the maximum number of individuals simultaneously infected during an outbreak and the time to reach such a maximum number for the first time. Specifically, this distribution is analyzed by distinguishing between a global outbreak and the local outbreaks, which are linked to the extinction of the disease and the extinction of particular strains of the disease, respectively. Based on the mass function of the maximum number of individuals simultaneously infected during the outbreak, we also present an iterative procedure for computing the final size of the epidemic. For illustrative purposes, the twostrain SIR-model with cross-immunity is applied to the study of the spread of antibiotic-sensitive and antibiotic-resistant bacterial strains within a hospital ward
Nuclear collisions at the Future Circular Collider
The Future Circular Collider is a new proposed collider at CERN with
centre-of-mass energies around 100 TeV in the pp mode. Ongoing studies aim at
assessing its physics potential and technical feasibility. Here we focus on
updates in physics opportunities accessible in pA and AA collisions not covered
in previous Quark Matter contributions, including Quark-Gluon Plasma and gluon
saturation studies, novel hard probes of QCD matter, and photon-induced
collisions.Comment: 4 pages, 5 figures, proceedings of Quark Matter 201
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