10,265 research outputs found
Jet Quenching: the medium modification of the single and double fragmentation functions
The physics of the quenching of hard jets in dense matter is briefly
reviewed. This is presented within the framework of the partonic medium
modification of the fragmentation functions. Modifications in both deeply
inelastic scattering (DIS) off large nuclei and high-energy heavy-ion
collisions are presented.Comment: 4 pages, 4 figures, Proceedings of the First Meeting of the APS
Topical Group on Hadronic Physics, Fermilab, Batavia, Illinois, Oct 24-26,
200
Equilibrium in Heavy Ion Collisions
We discuss the question of equilibriation in heavy ion collisions and how it
can be addressed in experimentComment: Proceedings 19th Winter Workshop on Nuclear Dynamics, Breckenridge,
Co, 200
Suppression of the high charged hadron at the LHC
We present a parameter free postdiction of the high- charged-hadron
nuclear modification factor () in two centralities, measured by the CMS
collaboration in - collisions at the Large Hadron Collider (LHC). The
evolution of the bulk medium is modeled using viscous fluid dynamics, with
parameters adjusted to describe the soft hadron yields and elliptic flow.
Assuming the dominance of radiative energy loss, we compute the medium
modification of the using a perturbative QCD based formalism, the
higher twist scheme. The transverse momentum diffusion coefficient is
assumed to scale with the entropy density and normalized by fitting the
in the most central - collisions at the Relativistic Heavy-Ion
Collider (RHIC). This set up is validated in non-central - collisions
at RHIC and then extrapolated to - collisions at the LHC, keeping the
relation between and entropy density unchanged. We obtain a
satisfactory description of the CMS over the range from 10-100
GeV.Comment: 4 pages, 3 figures, revtex4, new experimental data used, new
calculations with systematic error bands, changed abstract and contents,
conclusions unchange
Deciphering Deconfinement in Correlations of Conserved Charges
Diagonal and off-diagonal flavor and conserved charge susceptibilities reveal
the prevalent degrees of freedom of heated strongly interacting matter. Results
obtained from lattice simulations are compared with various model estimates in
an effort to weed down various possible pictures of a quark gluon plasma. We
argue that the vanishing of the off-diagonal quark flavor susceptibilities and
its derivatives with respect to chemical potential, at temperatures above
1.5Tc, can only be understood in a picture of a gas or liquid composed of
quasi-particles which carry the same quantum numbers as quarks and antiquarks.
A potential new observable, blind to neutral and non-strange particles, is
introduced and related via isospin symmetry to the ratio of susceptibilities of
baryonic strangeness to strangeness generated in the excited matter created at
RHIC.Comment: 5 pages, 3 figures, LATEX, To appear in the proceedings of the
International Conference on Strangeness in Quark Matter, Los Angeles, CA, Mar
26-31, 200
Longitudinal Broadening of Quenched Jets in Turbulent Color Fields
The near-side distribution of particles at intermediate transverse momentum,
associated with a high momentum trigger hadron produced in a high energy
heavy-ion collision, is broadened in rapidity compared with the jet cone. This
broadened distribution is thought to contain the energy lost by the progenitor
parton of the trigger hadron. We show that the broadening can be explained as
the final-state deflection of the gluons radiated from the hard parton inside
the medium by soft, transversely oriented, turbulent color fields that arise in
the presence of plasma instabilities. The magnitude of the effect is found to
grow with medium size and density and diminish with increasing energy of the
associated hadron.Comment: 4 pages, 2 figures, Revtex4, revised version, improved abstract and
introductio
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