6,135 research outputs found
Jet modification in three dimensional fluid dynamics at next-to-leading twist
The modification of the single inclusive spectrum of high transverse momentum
() pions emanating from an ultra-relativistic heavy-ion collision is
investigated. The deconfined sector is modelled using a full three dimensional
(3-D) ideal fluid dynamics simulation. Energy loss of high partons and
the ensuing modification of their fragmentation is calculated within
perturbative QCD at next-to-leading twist, where the magnitude of the higher
twist contribution is modulated by the entropy density extracted from the 3-D
fluid dynamics simulation. The nuclear modification factor () for pions
with a GeV as a function of centrality as well as with respect to
the reaction plane is calculated. The magnitude of contributions to the
differential within small angular ranges, from various depths in the
dense matter is extracted from the calculation and demonstrate the correlation
of the length integrated density and the from a given depth. The
significance of the mixed and hadronic phase to the overall magnitude of energy
loss are explored.Comment: 5 pages, 4 figures, Revte
Elliptic flow of resonances at RHIC: probing final state interactions and the structure of resonances
We propose the measurement of the elliptic flow of hadron resonances at the
Relativistic Heavy Ion Collider as a tool to probe the amount of hadronic final
state interactions for resonances at intermediate and large transverse momenta.
This can be achieved by looking at systematic deviations of the measured flow
coefficient from the scaling law given by the quark recombination
formalism. Our method can be generalized to explore the structure of exotic
particles, such as the recently found pentaquark .Comment: 5 pages, 2 figures; v2: accepted version for publication in Physical
Review C rapid communication
Possible Resolutions of the D-Paradox
We propose possible ways of explaining the net charge event-by-event
fluctuations in Au+Au collisions at the Relativistic Heavy Ion Collider within
a quark recombination model. We discuss various methods of estimating the
number of quarks at recombination and their implications for the predicted net
charge fluctuations. We also discuss the possibility of diquark and
quark-antiquark clustering above the deconfinement temperature.Comment: 5 pages, 2 figure
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