Forward di-hadron back-to-back correlations in $\mathbf{pA}$ collisions from rcBK evolution

Abstract

We study the disappearance of the away-side peak of the di-hadron correlation function in p+A vs p+p collisions at forward rapidities, when the scaterring process presents a manifest dilute-dense asymmetry. We improve the state-of-the-art description of this phenomenon in the framework of the Color Glass Condensate (CGC), for hadrons produced nearly back-to-back. In that case, the gluon content of the saturated nuclear target can be described with transverse-momentum-dependent gluon distributions, whose small-$x$ evolution we calculate numerically by solving the Balitsky-Kovchegov equation with running coupling corrections. We first show that our formalism provides a good description of the disappearance of the away-side azimuthal correlations in d+Au collisions observed at BNL Relativistic Heavy Ion Collider (RHIC) energies. Then, we predict the away-side peak of upcoming p+Au data at $\sqrt[]{s}=200$ GeV to be suppressed by about a factor 2 with respect to p+p collisions, and we propose to study the rapidity dependence of that suppression as a complementary strong evidence of gluon saturation in experimental data.

13 pages; 6 figures

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• Probing parton saturation and the gluon dipole via diffractive jet production at the Electron-Ion Collider
• Collinearly improved kernel suppresses Coulomb tails in the impact-parameter dependent Balitsky-Kovchegov evolution
• Broadening and saturation effects in dijet azimuthal correlations in p-p and p-Pb collisions at $\sqrt{{\mathbf{s}}_{\mathbf{NN}}}=$ 5.02 TeV
• Solution to the Balitsky-Kovchegov equation with the collinearly improved kernel including impact-parameter dependence
• One-Loop Corrections to Dihadron Production in DIS at Small $x$
• Forward dijets in proton-nucleus collisions at next-to-leading order: the real corrections
• Single Inclusive Hadron Production in DIS at Small $x$: Next to Leading Order Corrections
• Comparison of improved TMD and CGC frameworks in forward quark dijet production
• Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$
• Harmonics of Parton Saturation in Lepton-Jet Correlations at the EIC
• Evidence for Nonlinear Gluon Effects in QCD and their $A$ Dependence at STAR
• Dihadron production in DIS at NLO: the real corrections
• Dihadron Production in DIS at Small $x$ at Next to Leading Order: Transverse Photons
• Observation of enhanced double parton scattering in proton-lead collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Probing parton saturation with forward $Z^0$-boson production at small transverse momentum in p+p and p+A collisions
• Saturation effects in SIDIS at very forward rapidities
• On systematic effects in the numerical solutions of the JIMWLK equation
• Incoherent diffractive dijet production in electron DIS off nuclei at high energy
• The suppressions of dijet azimuthal correlations in the future EIC
• Direct quarkonium-plus-gluon production in DIS in the Color Glass Condensate
• Signature of gluon saturation in forward di-hadron correlations at the Large Hadron Collider
• Investigating the broadening phenomenon in two-particle correlations induced by gluon saturation
• Color Glass Condensate meets High Twist Expansion
• Description of di-hadron saturation signals within a universal nuclear parton distribution function approach
• Gluon imaging using azimuthal correlations in diffractive scattering at the Electron-Ion Collider
• Predictions for photon-jet correlations at forward rapidities in heavy-ion collisions
• QCD theory overview
• Forward rapidity isolated photon production in proton-nucleus collisions
• Coherent energy loss effects in dihadron azimuthal angular correlations in Deep Inelastic Scattering at small $x$
• ITMD factorization and broadening effects in production of forward di-jets