11,242 research outputs found
Reheating after Supercooling in the Chiral Phase Transition
The chirally symmetric quark-gluon plasma produced in energetic heavy-ion
collisions is predicted to supercool at the late stages of its evolution. The
thermal energy is then transformed into the potential energy associated with an
energetically unfavorable field configuration. Since the system is in an
unstable state it eventually rolls down to the true minimum of the effective
chiral potential. When this motion is described in terms of the sigma-model, we
find that the energy of the coherent field is very efficiently
converted into pionic excitations due to anharmonic oscillations around this
minimum. The system is expected to partially thermalize before its
disintegration.Comment: Final version accepted for publication, 8 pages, REVTe
Exploring the properties of the phases of QCD matter - research opportunities and priorities for the next decade
This document provides a summary of the discussions during the recent joint
QCD Town Meeting at Temple University of the status of and future plans for the
research program of the relativistic heavy-ion community. A list of compelling
questions is formulated, and a number of recommendations outlining the greatest
research opportunities and detailing the research priorities of the heavy-ion
community, voted on and unanimously approved at the Town Meeting, are
presented. They are supported by a broad discussion of the underlying physics
and its relation to other subfields. Areas of overlapping interests with the
"QCD and Hadron Structure" ("cold QCD") subcommunity, in particular the
recommendation for the future construction of an Electron-Ion Collider, are
emphasized. The agenda of activities of the "hot QCD" subcommunity at the Town
Meeting is attached.Comment: 34 pages of text, 254 references,16 figure
What is the temperature in heavy ion collisions?
We consider the Tsallis distribution as the source of the apparent slope of
one-particle spectra in heavy-ion collisions and investigate the equation of
state of this special quark matter in the framework of non-extensive
thermodynamics.Comment: Talk given by T.S.Biro at RHIC School 2003, Dec.8-11, 2003, Budapest,
Hungar
Jet Modification in a Brick of QGP Matter
We have implemented the LPM effect into a microscopic transport model with
partonic degrees of freedom by following the algorithm of Zapp & Wiedemann. The
Landau-Pomeranchuk-Migdal (LPM) effect is a quantum interference process that
modifies the emission of radiation in the presence of a dense medium. In QCD
this results in a quadratic length dependence for radiative energy loss. This
is an important effect for the modification of jets by their passage through
the QGP.
We verify the leading parton energy loss in the model against the leading
order Baier-Dokshitzer-Mueller-Peigne-Schiff-Zakharov (BDMPS-Z) result.
We apply our model to the recent observations of the modification of di-jets
at the LHC.Comment: Presented at Panic 1
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