منابع مشابه
Gravity and handedness of photons
Vacuum fluctuations of quantum fields are altered in presence of a strong gravitational background, with important physical consequences. We argue that a non-trivial spacetime geometry can act as an optically active medium for quantum electromagnetic radiation, in such a way that the state of polarization of radiation changes in time, even in the absence of electromagnetic sources. This is a qu...
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The DGLAP improved color dipole approach provides a good description of data for inclusive direct photon spectra at the energies of RHIC and Tevatron. Within the same framework we predict the transverse momentum distribution of direct photons at the CERN LHC energies.
متن کاملDirect Photons at RHIC
One of the most direct probes of the QGP is the radiation of thermal photons, emerging directly from the thermalized system and providing, in principle, the temperature in its hottest phases [1]. However, photons are largely produced in hadronic decays, as well as in QCD processes, such as annihilation and Compton, that occur before thermalization. Thermally produced photons must be distinguish...
متن کاملDirect Photons at RHIC
sNN = 200GeV with the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC) is given. Direct-photon yields for pT & 4GeV/c and photon-hadron azimuthal correlations were determined with the aid of an electromagnetic calorimeter. By detecting ee pairs from the internal conversion of virtual photons direct-photon yields were measured between 1 . pT . 4GeV/c. In Au+Au collisions thermal p...
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Three fast generators of direct photons in the central rapidity region of high-energy heavy-ion collisions have been presented The generator of prompt photons is based on a tabulation of p + p(p̄) data and binary scaling. Two generators of thermal direct photons, for hot hadron gas (HHG) and quark-gluon plasma (QGP) scenarios, assume the 1+1 Bjorken hydrodynamics. SPS and RHIC data can be fitted...
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ژورنال
عنوان ژورنال: Brazilian Journal of Physics
سال: 2008
ISSN: 0103-9733
DOI: 10.1590/s0103-97332008000400012