6,844 research outputs found
Extended Air Shower Simulations Based on EPOS
We discuss air shower simulations based on the EPOS hadronic interaction
model.
A remarkable feature is the fact that the number of produced muons is
considerably larger compared to other interaction models. We show that this is
due to an improved treatment of baryon-antibaryon production.Comment: Talk presented at EDS0
Critical O(N) - vector nonlinear sigma - models: A resume of their field structure
The classification of quasi - primary fields is outlined. It is proved that
the only conserved quasi - primary currents are the energy - momentum tensor
and the O(N) - Noether currents. Derivation of all quasi - primary fields and
the resolution of degeneracy is sketched. Finally the limits d=2 and d=4 of the
space dimension are discussed. Whereas the latter is trivial the former is only
almost so.Comment: 16 pages, Latex. To appear in the Proceedings of the XXII Conference
on Differential Methods in Theoretical Physics, Ixtapa, Mexico, September
20-24, 199
Hard probes and the event generator EPOS
After a short presentation of the event generator EPOS, we discuss the
production of heavy quarks and prompt photons which has been recently
implemented. Whereas we have satisfying results for the charm, work on photons
is still in progress
A Systematic Study on Direct Photon Production from Central Heavy Ion Collisions
We investigate the production of direct photons in central Au-Au collisions
at the relativistic Heavy-Ion Collider (RHIC) at 200 GeV per nucleon,
considering all possible sources. We treat thermal photons emitted from a
quark-gluon plasma and from a hadron gas, based on a realistic thermodynamic
expansion. Hard photons from elementary nucleon-nucleon scatterings are
included: primordial elementary scatterings are certainly dominant at large
transverse momenta, but also secondary photons from jet fragmentation and
jet-photon conversion cannot be ignored. In both cases we study the effect of
energy loss, and we also consider photons emitted from bremsstrahlung gluons
via fragmentation.Comment: 13 pages 19 figure
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