The effect of minijet on hadron spectra and azimuthal anisotropy in heavy-ion collisions

TL;DR

This paper reviews how minijets influence hadron spectra and azimuthal anisotropy in heavy-ion collisions, emphasizing their dominant role in intermediate transverse momentum regions and their contribution to observed anisotropies.

Contribution

It demonstrates that minijets significantly affect hadron production and azimuthal anisotropy, providing explanations without relying solely on flow models.

Findings

Minijets generate shower partons that dominate over thermal partons at LHC.

Azimuthal anisotropy can be explained by minijet effects without flow.

Recombination model effectively describes transverse momentum distributions.

Abstract

Here I review the transverse momentum distributions of identified hadrons produced in Au-Au collisions at RHIC and Pb-Pb collisions at LHC in the framework of recombination model. Minijets play an important role in generating shower partons in the intermediate $p_T$ region. At LHC, the resultant soft shower partons are even found to dominate over the thermal partons in the non-strange sector. The azimuthal anisotropy of the produced hadrons could also be explained as the consequence of the effects of minijets. Harmonic analysis of the $\phi$ dependence leads to $v_n(p_T, b)$ that can be well produced without reference to flow.