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Evidence of collinear factorization breaking due to collinear-to-soft Glauber exchanges for a 2 to 3 exclusive process at leading twist

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arxiv 2409.16067 v1 pith:XUPPTKHZ submitted 2024-09-24 hep-ph nucl-th

Evidence of collinear factorization breaking due to collinear-to-soft Glauber exchanges for a 2 to 3 exclusive process at leading twist

Saad Nabeebaccus , Jakob Schoenleber , Lech Szymanowski , Samuel Wallon This is my paper
classification hep-ph nucl-th
keywords leadingcollinearfactorizationglauberexclusivegluonpowerprocess
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We exhibit an exclusive process, namely the photoproduction of a $\pi^{0}\gamma$ pair with large invariant mass, which violates collinear factorization. We explicitly demonstrate that this is due to the fact that there exists diagrams with gluon exchange in $t$ channel, contributing at the leading power, for which Glauber gluons are trapped. This is caused by the pinching of the contour integration of both the plus and minus light-cone components of the Glauber gluon momentum. We argue that this leads to the observed ``endpoint-like'' divergence of the convolution integral at leading order and leading power when collinear factorization is na\"ively assumed.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Spacelike-Collinear Scattering by the Method of Regions

    hep-ph 2026-07 conditional novelty 8.0

    The kinematic factorisation-violating part of the two-loop spacelike-collinear splitting amplitude comes entirely from a single hidden region with soft and Glauber loop momenta.

  2. Exclusive photoproduction of a di-meson pair with large invariant mass

    hep-ph 2026-05 unverdicted novelty 7.0

    Calculations of di-meson photoproduction amplitudes at leading order show cross sections up to 100 times larger than single-meson cases, enabling better GPD extraction.

  3. Exclusive photoproduction of a di-meson pair with large invariant mass

    hep-ph 2026-05 unverdicted novelty 6.0

    Computes LO amplitudes for di-meson photoproduction channels sensitive to quark GPDs and reports high cross sections suitable for GPD studies at JLab energies.