Nabeebaccus, Saad and Schoenleber, Jakob and Szymanowski, Lech and Wallon, Samuel (2025) Demonstration of collinear factorization breaking due to collinear-to-soft Glauber exchanges for a 2 → 3 exclusive process at leading twist. PHYSICAL REVIEW D, 111 (9): L091502. ISSN 2470-0010, 2470-0029
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We exhibit an exclusive process, namely the photoproduction of ar0 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 "end pointlike" divergence of the convolution integral at leading order and leading power when collinear factorization is na & iuml;vely assumed.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ANNIHILATION PROCESSES; MASS DIVERGENCES; PAIR |
| Subjects: | 500 Science > 520 Astronomy & allied sciences 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 16 Jul 2026 06:30 |
| Last Modified: | 16 Jul 2026 06:30 |
| URI: | https://pred.uni-regensburg.de/id/eprint/66975 |
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