170 research outputs found
Energy loss of quarks in deconfined matter at RHIC: photon-tagged jets, single electron and dilepton spectra from open charm
We report a first attempt (i) to derive constraints on the energy loss of
charm quarks in a deconfined medium from the recent PHENIX data of
single-electron transverse momentum spectra and (ii) to estimate the resulting
suppression of dileptons from correlated semi-leptonic decays of open charmed
mesons. The momentum imbalance of photon-tagged light-quark jets is also
considered.Comment: contribution to Quark Matter 2002, Nantes, France, July 18 - 24, 200
Physical Information in the Thermal Continuum Dilepton Spectra
We consider the intermediate mass continuum of dileptons (between and
) in ultrarelativistic heavy--ion collisions. The thermal signal
depends essentially on thermodynamic state parameters of the hottest parton
stage as convoluted with an involved detector
acceptance function. A refined analysis of the transverse pair momentum
spectrum at fixed dilepton transverse mass can reveal the maximum temperature
of parton matter.Comment: 3 LaTeX pages including eps figures, contribution to the Erice School
on Nuclear Physics 1998 (to be published in "Progress in Particle and Nuclear
Physics"
Thermalization of Hadrons via Hagedorn States
Hagedorn states are characterized by being very massive hadron-like
resonances and by not being limited to quantum numbers of known hadrons. To
generate such a zoo of different Hagedorn states, a covariantly formulated
bootstrap equation is solved by ensuring energy conservation and conservation
of baryon number , strangeness and electric charge . The numerical
solution of this equation provides Hagedorn spectra, which enable to obtain the
decay width for Hagedorn states needed in cascading decay simulations. A single
(heavy) Hagedorn state cascades by various two-body decay channels subsequently
into final stable hadrons. All final hadronic observables like masses, spectral
functions and decay branching ratios for hadronic feed down are taken from the
hadronic transport model UrQMD. Strikingly, the final energy spectra of
resulting hadrons are exponential showing a thermal-like distribution with the
characteristic Hagedorn temperature
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