Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-10-28
Phys.Lett. B555 (2003) 181-188
Physics
High Energy Physics
High Energy Physics - Phenomenology
Final Version, To be published in Phys. Lett. B
Scientific paper
10.1016/S0370-2693(03)00080-7
An important ingredient for the non-equilibrium evolution of partons at RHIC and LHC is to have some physically reasonable initial conditions for the single particle phase space distribution functions for the partons. We consider several plausible parametrizations of initial conditions for the single particle distribution function f_i(x,p) and fix the parameters by matching \int f(x,p)p^\mu d \sigma_\mu to the invariant momentum space semi-hard parton distributions obtained using perturbative QCD (pQCD), as well as fitting low order moments of the distribution function. We consider parametrizations of f_i(x,p) with both boost invariant and boost non-invariant assumptions. We determine the initial number density, energy density and the corresponding (effective) temperature of the minijet plasma at RHIC and LHC energies. For a boost non-invariant minijet phase-space distribution function we obtain ~ 30(140) /fm^3 as the initial number density, ~ 50(520) GeV/fm^3 as the initial energy density and ~ 520(930) MeV as the corresponding initial effective temperature at RHIC(LHC).
Cooper Fred
Mottola Emil
Nayak Gouranga C.
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