Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$

Kolbé, Isobel; Roy, Kaushik; Salazar, Farid; Schenke, Bjoern; Venugopalan, Raju

doi:10.48550/arxiv.2008.04372

Cited by 2 publications

(2 citation statements)

References 70 publications

(136 reference statements)

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“…To access these distributions, differential measurements such as two-particle or two-jet correlations are needed. These measurements have been shown to allow access to the elliptic part of the gluon Wigner distribution at small x [34][35][36], the Weizsäcker-Williams unintegrated gluon distribution [37], multi-gluon correlations [38] and gluon saturation [39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

Gluon imaging using azimuthal correlations in diffractive scattering at the Electron-Ion Collider

Mäntysaari,

Roy,

Salazar

et al. 2020

Preprint

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We study coherent diffractive photon and vector meson production in electron-proton and electron-nucleus collisions within the Color Glass Condensate effective field theory. We show that electron-photon and electron-vector meson azimuthal angle correlations are sensitive to non-trivial spatial correlations in the gluon distribution of the target, and perform explicit calculations using spatially dependent McLerran-Venugopalan initial color charge configurations coupled to the numerical solution of small x JIMWLK evolution equations. We compute the cross-section differentially in Q 2 and |t| and find sizeable anisotropies in the electron-photon and electron-J/ψ azimuthal correlations (v1,2 ≈ 2 − 10%) in electron-proton collisions for the kinematics of the future Electron-Ion Collider. In electron-gold collisions these modulations are found to be significantly smaller (v1,2 < 0.1%). We also compute incoherent diffractive production where we find that the azimuthal correlations are sensitive to fluctuations of the gluon distribution in the target.

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Section: Introductionmentioning

confidence: 99%

Gluon imaging using azimuthal correlations in diffractive scattering at the Electron-Ion Collider

Mäntysaari,

Roy,

Salazar

et al. 2020

Preprint

Self Cite

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“…So far, no calculation with actual jet algorithm dependence is known within the CGC framework. Recently, there have been pioneered attempts to obtain the CGC jet or photon-jet processes at the NLO [80][81][82] using the small-cone approximation [83][84][85]. The main focus of these attempts is to demonstrate the infrared finiteness of the jet cross section.…”

Section: Introductionmentioning

confidence: 99%

Single Inclusive Jet Production in $pA$ Collisions at NLO in the small-$x$ regime

Liu¹,

Xie²,

Kang³

et al. 2022

Preprint

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We present the first complete next-to-leading-order (NLO) prediction with full jet algorithm implementation for the single inclusive jet production in pA collisions at forward rapidities within the color glass condensate (CGC) effective theory. Our prediction is fully differential over the final state physical kinematics, which allows the implementation of any infra-red safe observable including the jet clustering procedure. The NLO calculation is organized with the aid of the observable originated power counting proposed in [1] which gives rise to the novel soft contributions in the CGC factorization. We achieve the fullydifferential calculation by constructing suitable subtraction terms to handle the singularities in the real corrections. The subtraction contributions can be exactly integrated analytically. We present the NLO cross section with the jets constructed using the anti-k T algorithm. The NLO calculation demonstrates explicitly the validity of the CGC factorization in jet production. Furthermore, as a byproduct of the subtraction method, we also derive the fully analytic cross section for the forward jet production in the small-R limit. We show that in the small-R approximation, the forward jet cross section can be factorized into a semihard cross section that produces a parton and the semi-inclusive jet functions (siJFs).We argue that this feature holds for generic jet production and jet substructure observables in the CGC framework. Last, we show numerical analyses of the derived formula to validate our calculations. We justify when the small-R approximation is appropriate. Like forward hadron production, the obtained NLO result also exhibits the negativity of the cross section in the large jet transverse regime, which signals the need for the threshold resummation. A sketch of the threshold resummation in the CGC framework is presented based on the multiple emission picture and it is found to agree with the approach using the rapidity renormalization group equation developed in [2].

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Inclusive prompt photon-jet correlations as a probe of gluon saturation in electron-nucleus scattering at small $x$

Cited by 2 publications

References 70 publications

Gluon imaging using azimuthal correlations in diffractive scattering at the Electron-Ion Collider

Gluon imaging using azimuthal correlations in diffractive scattering at the Electron-Ion Collider

Single Inclusive Jet Production in $pA$ Collisions at NLO in the small-$x$ regime

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