15 research outputs found
Enhanced J/Psi Production in Deconfined Quark Matter
In high energy heavy ion collisions at the Relativistic Heavy Ion Collider
(RHIC) at Brookhaven and the Large Hadron Collider (LHC) at CERN, each central
event will contain multiple pairs of heavy quarks. if a region of deconfined
quarks and gluons is formed, a new mechanism for the formation of heavy
quarkonium bound states will be activated. This is a result of the mobility of
heavy quarks in the deconfined region, such that bound states can be formed
from a quark and an antiquark which were originally produced in separate
incoherent interactions. Model estimates of this effect for J/psi production at
RHIC indicate that significant enhancements are to be expected. Experimental
observation of such enhanced production would provide evidence for
deconfinement unlikely to be compatible with competing scenarios.Comment: Added predictions with nonthermal charm quark distributions, also
with gluon dissociation replaced by screening. Accepted for publication in
Phys. Rev.
B_c Meson Production in Nuclear Collisions at RHIC
We study quantitatively the formation and evolution of B_c bound states in a
space-time domain of deconfined quarks and gluons (quark-gluon plasma, QGP). At
the Relativistic Heavy Ion Collider (RHIC) one expects for the first time that
typical central collisions will result in multiple pairs of heavy (in this case
charmed) quarks. This provides a new mechanism for the formation of heavy
quarkonia which depends on the properties of the deconfined region. We find
typical enhancements of about 500 fold for the B_c production yields over
expectations from the elementary coherent hadronic B_c-meson production
scenario. The final population of bound states may serve as a probe of the
plasma phase parameters.Comment: 9 Pages, 11 Postscript Figure
Analysis of DCC Domain Structure
Wavelet-type methods are employed for the analysis of pion field
configurations that have been obtained by dynamical simulations in idealized
scenarios relevant to the formation of disoriented chiral condensates. It is
illustrated how the measurement of the isospin domain structure depends on the
ability to zoom in on limited parts of the phase space, due to the interplay
between the pion correlation length and the effective source geometry. The need
for advanced analysis methods is underscored by the fact that the extracted
neutral-fraction distribution would differ significantly from the ideal form,
even under perfect experimental conditions, and, moreover, by the circumstance
that thermal sources with suitably adjusted temperatures can lead to
distributions that may be practically indistinguishable from those arising from
DCC-type non-equilibrium evolutions.Comment: 18 pages, Latex, 7 Figures included as .ps file
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BOUND FOR EFFECTIVE POLARIZATION IN D PRODUCTION IN A REGGE-POLE EXCHANGE MODEL
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BOUND FOR EFFECTIVE POLARIZATION IN D PRODUCTION IN A REGGE-POLE EXCHANGE MODEL
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