Abstract
The sources of particle production in relativistic heavy-ion collisions are investigated from RHIC to LHC energies. Whereas charged-hadron production in the fragmentation sources follows a ln( s NN / s 0 ) law, particle production in the mid-rapidity low- x gluon-gluon source exhibits a much stronger dependence ∝ ln 3 ( s NN / s 0 ), and becomes dominant between RHIC and LHC energies. The equilibration of the three sources is investigated in a relativistic diffusion model (RDM). It agrees with the thermal model only for t → ∞.
Highlights
The statistical hadronization or thermal model [1] has consistently provided good descriptions of relative or absolute particle production yields in e+e−, pp and relativistic heavy-ion collisions, e.g. [2, 3]
A necessary and sufficient condition for statistical equilibrium in the systems under investigation is provided by the distribution functions of the relevant observables rather than the particle yields
In the Relativistic Diffusion Model (RDM) [11, 12], therapidity distribution of produced particles emerges from an incoherent superposition of the beam-like fragmentation components at larger rapidities y arising from valence quark-gluon interactions, and a component centered at midrapidity due to gluon-gluon collisions
Summary
The statistical hadronization or thermal model [1] has consistently provided good descriptions of relative or absolute particle production yields in e+e−, pp and relativistic heavy-ion collisions, e.g. [2, 3]. The statistical hadronization or thermal model [1] has consistently provided good descriptions of relative or absolute particle production yields in e+e−, pp and relativistic heavy-ion collisions, e.g. At RHIC and LHC energies, the deviations in a pT -region of 0.5 < pT < 8 GeV/c and the ensuing transition from exponential to power-law pT -distributions are usually attributed to collective expansion. Centralities compared with distribution functions ∝ [1 + (q − 1)mT /T ]−q/(q−1) for q = 1.12 that implicitly account for thermal emission and collective expansion, but not for hard (pQCD) processes at pT ≥ 8 GeV/c.
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