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Probing gluon GTMDs through exclusive coherent diffractive processes
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abstract
We extend a previous GTMD model to improve the description of the HERA data on diffractive dijet production, and include exclusive coherent diffractive $J/\psi$ production data. We find that within our gluon GTMD model context and assumptions, there is considerable tension between the data for these two types of processes concerning the $t$ dependence. Photo- and electroproduction data for protons and nuclei from EIC and UPC data from LHC and RHIC can help to establish whether a common GTMD description is possible, as one would expect, and to facilitate studies of such data we provide predictions for the various experiments. We point out explicitly in which sense this goes beyond the description in terms of GPDs.
Forward citations
Cited by 4 Pith papers
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Gluon GTMDs in the exclusive electroproduction of heavy-quark pairs
Exclusive heavy-quark pair electroproduction is expressed through gluon GTMDs, with all azimuthal modulations catalogued and shown to reduce consistently to GPD-based formulas in the collinear limit.
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Exclusive Quark and Gluon Dijet Production as Probes of GPDs at Collider Energies
Exclusive dijet electroproduction probes GPDs via new LO amplitudes for quark (with helicity and QED) and gluon channels, with HERA comparison and EIC projections.
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Exclusive Quark and Gluon Dijet Production as Probes of GPDs at Collider Energies
Exclusive quark and gluon dijet electroproduction is analyzed in collinear factorization as a GPD probe, extending prior work with helicity GPDs and an electromagnetic channel, with HERA comparisons and EIC projections.
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Ultra-peripheral Collisions
Ultra-peripheral collisions of heavy ions are reviewed as the energy frontier for photon physics; the paper consolidates a decade of LHC/RHIC results and proposes no new measurement.
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