Rapidity window dependence of ridge correlations in the glasma

TL;DR

This paper investigates how ridge correlations in proton-proton collisions at 7 TeV depend on rapidity window size within the glasma framework, revealing intrinsic long-range azimuthal collimation and the role of source gluons.

Contribution

It demonstrates the rapidity window dependence of ridge correlations in the glasma model and links the enhancement to source gluons, providing a new way to test gluon production mechanisms.

Findings

Ridge correlations increase with larger rapidity windows.

Azimuthal collimation is intrinsic to glasma dynamics.

Quantum evolution of gluons shows unique correlation patterns.

Abstract

We study ridge correlations of the glasma in pp collisions at $\sqrt{s_{\mathrm{NN}}}=7$ TeV by using the color glass condensate (CGC) formalism. The azimuthal collimation at long range rapidity is intrinsic to glasma dynamics and is reproduced here. When rapidity window enlarges, ridge correlations in two dimensional $\Delta y$-$\Delta\phi$ distribution and one dimensional $\Delta\phi$ distribution at long range rapidity gap are enhanced. The enhancements are demonstrated to be the contributions of source gluons. The quantum evolution of the gluons presents unique correlation patterns in differential correlation function. These characters of two gluon correlations open a way of testing the production mechanism from experimental measurements.