Probing gluon saturation via diffractive jets in ultra-peripheral nucleus-nucleus collisions

Iancu, E.; Mueller, A. H.; Triantafyllopoulos, D. N.; Wei, S. Y.

doi:10.1140/epjc/s10052-023-12165-8

Probing gluon saturation via diffractive jets in ultra-peripheral nucleus-nucleus collisions

Journal Article · Sat Nov 25 00:00:00 EST 2023 · European Physical Journal. C, Particles and Fields (Online)

DOI:https://doi.org/10.1140/epjc/s10052-023-12165-8· OSTI ID:2221884

Iancu, E.; Mueller, A. H.; Triantafyllopoulos, D. N.; Wei, S. Y.

Abstract

We argue that semi-inclusive photo-production of a pair of hard jets via coherent diffraction in nucleus-nucleus ultra-peripheral collisions at high energy is a golden channel to study gluon saturation. The dominant contribution is the diffractive production of three jets in an asymmetric configuration. Two of the jets are hard and propagate at nearly central pseudo-rapidities. The third jet is semi-hard, with transverse momentum comparable to the nuclear saturation momentum, and is well separated in pseudo-rapidity from the hard dijets. The emission of the semi-hard jet allows for strong scattering, thus avoiding the “higher-twist” suppression of the exclusive dijet production due to colour transparency. We compute the trijet cross-section using the diffractive TMD factorisation which emerges from the CGC effective theory at high energy. The cross-section is controlled by gluon saturation, which leaves its imprints on the structure of the final state, notably on the rapidity distribution.

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Research Organization:: Columbia Univ., New York, NY (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-92ER40699

OSTI ID:: 2221884

Alternate ID(s):: OSTI ID: 2580051

Journal Information:: European Physical Journal. C, Particles and Fields (Online), Journal Name: European Physical Journal. C, Particles and Fields (Online) Journal Issue: 11 Vol. 83; ISSN 1434-6052

Publisher:: Springer Science + Business MediaCopyright Statement

Country of Publication:: Germany

Language:: English

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