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Multi-gluon correlations and evidence of saturation from dijet measurements at an Electron Ion Collider
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Multi-gluon correlations and evidence of saturation from dijet measurements at an Electron Ion Collider
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We study inclusive and diffractive dijet production in electron-proton and electron-nucleus collisions within the Color Glass Condensate effective field theory. We compute dijet cross sections differentially in both mean dijet transverse momentum $\mathbf{P}$ and recoil momentum $\mathbf{\Delta}$, as well as the anisotropy in the relative angle between $\mathbf{P}$ and $\mathbf{\Delta}$. We use the nonlinear Gaussian approximation to compute multiparticle correlators for general small $x$ kinematics, employing running coupling Balitsky-Kovchegov evolution to determine the dipole amplitude at small $x$. Our results cover a much larger kinematic range than accessible in previous computations performed in the correlation limit approximation, where it is assumed that $|\mathbf{P}| \gg |\mathbf{\Delta}|$. We validate this approximation in its range of applicability and quantify its failure for $|\mathbf{P}| \lesssim |\mathbf{\Delta}|$. We also predict significant target-dependent deviations from the correlation limit approximation for $|\mathbf{P}| > |\mathbf{\Delta}|$ and $|\mathbf{P}| \lesssim Q_s$, which offers a straightforward test of gluon saturation and access to multi-gluon distributions at a future electron ion collider.
Forward citations
Cited by 6 Pith papers
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When JIMWLK evolution really matters: the example of incoherent diffraction
JIMWLK evolution gives larger incoherent diffraction cross sections than the Gaussian approximation for photon-nucleus collisions because the latter is invalid for four-gluon starting correlators.
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When JIMWLK evolution really matters: the example of incoherent diffraction
JIMWLK evolution produces systematically larger incoherent diffraction cross sections than the Gaussian Approximation in photon-nucleus collisions because the latter is invalid for four-gluon-exchange correlators.
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Forward trijet production in proton-nucleus collisions: gluon initiated channel
The gluon-initiated trijet channel in forward pA collisions is calculated at leading order in CGC, revealing a four-gluon vertex structure matching instantaneous terms and showing how rapidity and collinear divergence...
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Forward trijet production in proton-nucleus collisions: gluon initiated channel
Analytical CGC amplitudes and cross sections for forward g o q¯qg and g o ggg trijet production in pA collisions are obtained, with rapidity and collinear divergences shown to match JIMWLK and DGLAP evolution.
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Twisting Small-$x$ Gluon Tomography with Orbital Angular Momentum
Proposes OAM-resolved extension of small-x gluon tomography via twisted lepton currents yielding tunable M-resolved elliptic correlations A_2^(M)(q_T, R_γ) with projection zeros unavailable in plane-wave setups.
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Azimuthal decorrelation in diffractive dijet production
All-order resummation of soft gluons for transverse energy-energy correlators in diffractive dijet production demonstrates sensitivity of acoplanarity to diffractive TMDs.
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