Gluon splitting in a shockwave

Abstract

The study of azimuthal correlations in particle production at forward rapidities in proton-nucleus collisions provides direct information about high gluon density effects, like gluon saturation, in the nuclear wavefunction. In the kinematical conditions for proton-lead collisions at the LHC, the forward di-hadron production is dominated by partonic processes in which a gluon from the proton splits into a pair of gluons, while undergoing multiple scattering off the dense gluon system in the nucleus. We compute the corresponding cross-section using the Colour Glass Condensate effective theory, which enables us to include the effects of multiple scattering and gluon saturation in the leading logarithmic approximation at high energy. This opens the way towards systematic studies of angular correlations in two-gluon production, similar to previous studies for quark-gluon production in the literature. We consider in more detail two special kinematical limits: the "back-to-back correlation limit", where the transverse momenta of the produced gluons are much larger than the nuclear saturation momentum, and the "double parton scattering limit", where the two gluons are produced by a nearly collinear splitting occurring prior to the collision. We argue that saturation effects remain important even for relatively high transverse momenta (i.e. for nearly back-to-back configurations), leading to geometric scaling in the azimuthal distribution.

arXiv comment26 pages, 4 figures

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• Sudakov Double Logarithms Resummation in Hard Processes in Small-x Saturation Formalism
• Improved TMD factorization for forward dijet production in dilute-dense hadronic collisions
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• Multi-gluon correlations and evidence of saturation from dijet measurements at an Electron Ion Collider
• On the Dihadron Angular Correlations in Forward $pA$ collisions
• Probing parton saturation and the gluon dipole via diffractive jet production at the Electron-Ion Collider
• TMD gluon distributions at small x in the CGC theory
• Saturation effects in forward-forward dijet production in p+Pb collisions
• 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
• Low-$x$ improved TMD approach to the lepto- and hadroproduction of a heavy-quark pair
• Forward trijet production in proton-nucleus collisions
• Universal Suppression of Heavy Quarkonium Production in pA Collisions at Low Transverse Momentum
• 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
• Dihadron production in DIS at NLO: the real corrections
• JIMWLK evolution for multi-particle production in Langevin form
• Saturation effects in SIDIS at very forward rapidities
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• Exploring minijets beyond the leading power
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• Towards tomography of quark-gluon plasma using double inclusive forward-central jets in Pb-Pb collision
• Piecewise Linear Wilson lines
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• A new approach to piecewise linear Wilson lines
• High Energy Collisions of Dense Hadrons in Quantum Chromodynamics : LHC Phenomenology and Universality of Parton Distributions