Gluon saturation and inclusive production at low transverse momenta

TL;DR

This paper generalizes the $k_T$-factorization formula for gluon production in dense-dense systems, revealing a suppression factor at low transverse momenta consistent with Color Glass Condensate numerical results.

Contribution

It introduces a generalized $k_T$-factorization formula accounting for saturation effects in dense-dense scattering, including a Sudakov-like suppression factor.

Findings

Soft gluon production is suppressed at low $p_T$

The suppression depends on the ratio $p^2_T/Q^2_s$

Results agree with previous Color Glass Condensate calculations

Abstract

In this letter we suggest the generalization of $k_T$-factorization formula for inclusive gluon production for the dense-dense parton system scattering. It turnes out that the soft gluon production with transverse momentum $p_T$ is suppressed by additional Sudakov-like factor that depends on $p^2_T/Q^2_s$ ratio in a good agreement with the first numerical calculation in Colour Glass Condensate approach by J.P. Blaizot, T. Lappi and Y. Mehtar-Tan.