Volume 485 - The European Physical Society Conference on High Energy Physics (EPS-HEP2025) - T05 QCD and Hadronic Physics
Diffractive dijets in 𝑒𝑝 → 𝑒′𝑗𝑒𝑡 𝑗𝑒𝑡 𝑝 reaction using GTMDs
M. Luszczak
Full text: Not available
Abstract
Exclusive (diffractive) dijet production in $ep$ scattering provides direct access to transverse-momentum
dependent gluon dynamics at small~$x$.
We summarize a momentum-space dipole/GTMD calculation of $ep\to e\,p\,jj$ in which the diffractive amplitude
is expressed through off-forward unintegrated gluon distributions (gluon GTMDs).
Several GTMD models from the literature are confronted with H1 and ZEUS measurements under the corresponding
experimental cuts.
With the exception of a GTMD tuned to a subset of H1 observables, the exclusive $q\bar q$ channel typically
undershoots the measured cross sections; ZEUS data impose the strongest constraints.
We also show that sizeable azimuthal modulations between the dijet momentum sum and difference can be generated
purely by jet $p_T$ cuts, potentially mimicking signals of elliptic gluon distributions.
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