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arXiv · 2610.25855

Coherent and Dissociative Photon-Induced Production in Herwig 7

L. Grazette·K. Lohwasser·M. R. Masouminia
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Abstract

We present a particle-level study of photon-induced production in Herwig 7, focusing on coherent, single-dissociative and double-dissociative proton configurations. The simulation combines the Budnev elastic photon flux with an inelastic photon PDF and uses internal Herwig 7 matrix elements for $γγ\to \ell^+\ell^-$ and $γγ\to W^+W^-\to \ell^+\ell^-ν\barν$ as the central setup. Using a dedicated Rivet analysis, we compare hard-system kinematics, charged-particle activity, rapidity-gap observables and forward-remnant-sensitive distributions. We find that shower-setting changes generally have modest effects on hard-system distributions in well-populated regions, while coherent and dissociative samples differ most clearly in additional charged activity and rapidity-gap observables. These results provide a useful baseline for modelling semi-exclusive photon-induced measurements at the LHC and identify the observables most sensitive to dissociative activity in future generator comparisons.

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L. Grazette, K. Lohwasser, M. R. Masouminia. 2026-10-19. Coherent and Dissociative Photon-Induced Production in Herwig 7. https://arxiv.org/abs/2610.25855

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