256 research outputs found
Jet quenching pattern at LHC in PYQUEN model
The first LHC data on high transverse momentum hadron and dijet spectra in
PbPb collisions at center-of-mass energy 2.76 TeV per nucleon pair are analyzed
in the frameworks of PYQUEN jet quenching model. The presented studies for the
nuclear modification factor of high-pT hadrons and the imbalance in dijet
transverse energy support the supposition that the intensive wide-angular
("out-of-cone") medium-induced partonic energy loss is seen in central PbPb
collisions at the LHC.Comment: 5 pages including 4 figures as EPS-files; prepared using LaTeX
package for publication in the European Physical Journal
Monte Carlo Tools for Jet Quenching
A thorough understanding of jet quenching on the basis of multi-particle
final states and jet observables requires new theoretical tools. This talk
summarises the status and propects of the theoretical description of jet
quenching in terms of Monte Carlo generators.Comment: proceedings of the 22nd International Conference on
Ultra-Relativistic Nucleus Nucleus Collisions (Quark Matter 2011
Decoherence and energy loss in QCD cascades in nuclear collisions
The medium modifications in the properties of QCD cascades are considered. In
particular, the changes in the intrajet rapidity distributions due to
medium-induced decoherence, collisional losses of cascade gluons and those of
final prehadrons are analyzed
Jet Reconstruction in Heavy Ion Collisions
We examine the problem of jet reconstruction at heavy-ion colliders using
jet-area-based background subtraction tools as provided by FastJet. We use
Monte Carlo simulations with and without quenching to study the performance of
several jet algorithms, including the option of filtering, under conditions
corresponding to RHIC and LHC collisions. We find that most standard algorithms
perform well, though the anti-kt and filtered Cambridge/Aachen algorithms have
clear advantages in terms of the reconstructed transverse-momentum offset and
dispersion.Comment: 31 pages, 17 figure
High Energy Nuclear Collisions: Theory Overview
We review some basic concepts of Relativistic Heavy Ion Physics and discuss
our understanding of some key results from the experimental program at the
Relativistic Heavy Ion Collider (RHIC). We focus in particular on the early
time dynamics of nuclear collisions, some result from lattice QCD, hard probes
and photons.Comment: 11 pages, 3 figures; delivered at ISNP 2009, published in Praman
A Monte Carlo Model for 'Jet Quenching'
We have developed the Monte Carlo simulation program JEWEL 1.0 (Jet Evolution
With Energy Loss), which interfaces a perturbative final state parton shower
with medium effects occurring in ultra-relativistic heavy ion collisions. This
is done by comparing for each jet fragment the probability of further
perturbative splitting with the density-dependent probability of scattering
with the medium. A simple hadronisation mechanism is included. In the absence
of medium effects, we validate JEWEL against a set of benchmark jet
measurements. For elastic interactions with the medium, we characterise not
only the medium-induced modification of the jet, but also the jet-induced
modification of the medium. Our main physics result is the observation that
collisional and radiative medium modifications lead to characteristic
differences in the jet fragmentation pattern, which persist above a soft
background cut. We argue that this should allow to disentangle collisional and
radiative parton energy loss mechanisms by measuring the n-jet fraction or a
class of jet shape observables.Comment: 16 pages, 10 figures, v2: version accepted by EPJ
Emerging pharmacotherapy of tinnitus
Tinnitus, the perception of sound in the absence of an auditory stimulus, is perceived by about 1 in 10 adults, and for at least 1 in 100, tinnitus severely affects their quality of life. Because tinnitus is frequently associated with irritability, agitation, stress, insomnia, anxiety and depression, the social and economic burdens of tinnitus can be enormous. No curative treatments are available. However, tinnitus symptoms can be alleviated to some extent. The most widespread management therapies consist of auditory stimulation and cognitive behavioral treatment, aiming at improving habituation and coping strategies. Available clinical trials vary in methodological rigor and have been performed for a considerable number of different drugs. None of the investigated drugs have demonstrated providing replicable long-term reduction of tinnitus impact in the majority of patients in excess of placebo effects. Accordingly, there are no FDA or European Medicines Agency approved drugs for the treatment of tinnitus. However, in spite of the lack of evidence, a large variety of different compounds are prescribed off-label. Therefore, more effective pharmacotherapies for this huge and still growing market are desperately needed and even a drug that produces only a small but significant effect would have an enormous therapeutic impact. This review describes current and emerging pharmacotherapies with current difficulties and limitations. In addition, it provides an estimate of the tinnitus market. Finally, it describes recent advances in the tinnitus field which may help overcome obstacles faced in the pharmacological treatment of tinnitus. These include incomplete knowledge of tinnitus pathophysiology, lack of well-established animal models, heterogeneity of different forms of tinnitus, difficulties in tinnitus assessment and outcome measurement and variability in clinical trial methodology. © 2009 Informa UK Ltd.Fil: Langguth, Berthold. Universitat Regensburg; AlemaniaFil: Salvi, Richard. State University of New York; Estados UnidosFil: Elgoyhen, Ana Belen. Consejo Nacional de Investigaciones CientĂficas y TĂ©cnicas. Instituto de Investigaciones en IngenierĂa GenĂ©tica y BiologĂa Molecular "Dr. HĂ©ctor N. Torres"; Argentin
Reconstructed Jets at RHIC
To precisely measure jets over a large background such as pile up in high
luminosity p+p collisions at LHC, a new generation of jet reconstruction
algorithms is developed. These algorithms are also applicable to reconstruct
jets in the heavy ion environment where large event multiplicities are
produced. Energy loss in the medium created in heavy ion collisions are already
observed indirectly via inclusive hadron distributions and di-hadron
correlations. Jets can be used to study this energy loss in detail with reduced
biases. We review the latest results on jet-medium interactions as seen in A+A
collisions at RHIC, focusing on the recent progress on jet reconstruction in
heavy ion collisions.Comment: Proceedings for the 26th Winter Workshop on Nuclear Dynamic
Jet Quenching in Heavy Ion Collisions
This review article was prepared for the Landolt-Boernstein volume on
Relativisitc Heavy Ion Physics.Comment: Review articel accepted for publication in the Landolt-Boernstein
Handbook of Physics, ed. R. Stock. 41 pages LaTex, 7 eps-figure
The FLUKA code: present applications and future developments
The main features of the FLUKA Monte Carlo code, which can deal with
transport and interaction of electromagnetic and hadronic particles, are
summarised. The physical models embedded in FLUKA are mentioned, as well as
examples of benchmarking against experimental data. A short history of the code
is provided and the following examples of applications are discussed in detail:
prediction of calorimetric performances, atmospheric neutrino flux
calculations, dosimetry in atmosphere and radiobiology applications, including
hadrontherapy and space radiation protection. Finally a few lines are dedicated
to the FLUKA server, from which the code can be downloaded.Comment: talk from the 2003 Computing in High Energy and Nuclear Physics
(CHEP03), La Jolla, Ca, USA, March 2003, 8 pages, pd
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