Open charm, photon, and dilepton production in an increasingly strongly interacting parton plasma

Abstract

We examine the effects that the new equilibration scenario of the increasingly strongly interacting parton plasma and the nonequilibrium environment have on the production of open charms, photons, and dileptons at Large Hadron Collider ͑LHC͒ and at Relativistic Heavy Ion Collider ͑RHIC͒ energies. We show that an out-of-equilibrium effect, not shown before, changes significantly the relative yield of the two main partonic contributions to photon production in the higher p T range, and higher orders for electromagnetic emissions have increased significance in the new scenario especially at RHIC energies. We argue that the effects of the new scenario are not restricted just to the parton phase but will continue through to the later hadron gas phase with potentially positive implications for the detection of the quark-gluon plasma. ͓S0556-2813͑98͒02710-1͔

Photon emission in Pb + Pb collisions at SpS and LHC

“…10, left plot, with results from ref. [25]. In these evaluations initial conditions are taken from HIJING event generator, and then Boltzmann equation was solved with collisional term including all possible QCD binary interactions as well as reaction gg ↔ ggg, included to describe establishing of chemical equilibrium.…”

Equilibration and particle production in an Increasingly Strongly Interacting Parton Plasma

“…This process is not subject to direct effect, contrary to appearance, because this is a hard process and is therefore at a different scale, in general, from that for equilibration [3]. As seen in Fig.…”

“…When we go from the standard parton plasma to ISIPP, there are two categories of effects that make the difference in particle production. They are the direct and indirect effects [3]. The former is where QCD has at least a partial role to play in the production process and hence there will be explicit dependence on α s .…”

Heavy Ion Physics at LHC

“…Open charm 9 will mostly be produced in the early interaction stage (because of the heavy mass) and will survive to the final state.…”