Medium-induced transverse momentum broadening via forward dijet correlations

Abstract

Dijet azimuthal angle correlation is arguably one of the most direct probes of the medium-induced broadening effects. The evidence for such broadening, however, is not yet clearly observed within the precision of current midrapidity measurements at RHIC and the LHC. We show that the dijet correlation in forward rapidity from the future LHC RUN3, aided by forward detector upgrades, can reveal this broadening thanks to the steeper jet spectra, suppressed vacuum radiations and lower underlying event background, with a sensitivity comparable to that of the future high-luminosity Au þ Au run at RHIC. Dijet correlation measurements at the two facilities together can provide powerful constraints on the temperature dependence of medium transport properties.

Jet quenching and effects of non-Gaussian transverse-momentum broadening on dijet observables

“…Furthermore, we plan to investigate the broadening due to multiple scatterings in a more forward rapidity region, which is advocated in Ref. [28]. However, this may require accounting for saturation effects [73] which together with the Sudakov effects act to generate considerable broadening in the final-state observables of the p-p and p-Pb collisions [74].…”

“…For example, the final-state interactions would lead to the gradual decorrelation of jets that originally were created from a vacuum 2 → 2 matrix element [26] (see also Refs. [27][28][29]). In addition, one needs to account for the initial state, i.e., the evolution of the system that leads to hard scattering.…”

Jet quenching and effects of non-Gaussian transverse-momentum broadening on di-jet observables

“…Furthermore, we plan to investigate the broadening due to multiple scatterings in the more forward rapidity region, which is advocated in Ref. [26]. However, this may require accounting for saturation effects [46] which together with the Sudakov effects act to generate considerable broadening in the final-state observables of the p-p and p-Pb collisions [47].…”

“…An important question is whether jet observables are sensitive to such interactions, especially those that are sensitive to recoils. For example, the finalstate interactions would lead to the gradual decorrelation of jets that originally were created from a vacuum 2 → 2 matrix element [24], see also [25,26]. In addition, one needs to account for the initial state, i.e.…”

Coherent energy loss effects in dihadron azimuthal angular correlations in Deep Inelastic Scattering at small $x$

“…Two-particle production and azimuthal angular correlations are perhaps the most sensitive probe of saturation dynamics and as such have been intensively studied in the CGC formalism [10][11][12][13][14][15][16][17][18][19][20][21][22][23]. The Color Glass Condensate formalism predicts a broadening and eventual disappearing of the away side peak in dihadron back-to-back correlations [12] as experimentally observed in forward rapidity proton (deuteron)-nucleus collisions at RHIC [24,25].…”