Multiparticle production in nuclear collisions using effective-energy approach

Some aspects of multiparticle production in high energy nuclear interactions

We report some results on mean normalized multiplicity (RA). This quantity shows independence with energy for pion-nucleus and proton-nucleus interactions both. The variation of RA4 with mean number of collisions made by incident hdaron inside the nucleus has also been studied.

Collective mechanism of dilepton production in high–energy nuclear collisions

Collective bremsstrahlung of vector meson fields in relativistic nuclear collisions is studied within the time–dependent Walecka model. Mutual deceleration of the colliding nuclei is described by introducing the effective stopping time and average rapidity loss of baryons. It is shown that electromagnetic decays of virtual ω–mesons produced by bremsstrahlung mechanism can provide a substantial ...

Thermal photon production in high-energy nuclear collisions.

We use a boost-invariant one-dimensional (cylindrically symmetric) fluid dynamics code to calculate thermal photon production in the central rapidity region of S+Au and Pb+Pb collisions at SPS energy ( √ s = 20 GeV/nucleon). We assume that the hot matter is in thermal equilibrium throughout the expansion, but consider deviations from chemical equilibrium in the high temperature (deconfined) pha...

Heavy-resonance production in high-energy nuclear collisions.

We estimate freezeout conditions for s, c, and b quarks in high energy nuclear collisions. Freezeout is due either to loss of thermal contact, or to particles “wandering” out of the region of hot matter. We then develop a thermal recombination model in which both single-particle (quark and antiquark) and two-particle (quark-antiquark) densities are conserved. Conservation of twoparticle densiti...

A Pqcd-based Approach to Parton Production and Equilibration in High-energy Nuclear Collisions *