Coherent and Dissociative Photon-Induced Production in Herwig 7
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→ ℓ+ℓ- and γγ→ W+W-→ ℓ+ℓ-νν̅ 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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BibTeX
@misc{grazette2026coherent,
title = {{Coherent and Dissociative Photon-Induced Production in Herwig 7}},
author = {L. Grazette and K. Lohwasser and M. R. Masouminia},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.25855},
eprint = {2610.25855},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.25855},
note = {CC0},
}
RIS
TY - UNPB
TI - Coherent and Dissociative Photon-Induced Production in Herwig 7
AU - L. Grazette
AU - K. Lohwasser
AU - M. R. Masouminia
PY - 2026
DA - 2026/10/19
PB - arXiv
DO - 10.48550/arxiv.2610.25855
UR - https://arxiv.org/abs/2610.25855
AB - 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→ ℓ^+ℓ^- and γγ→ W^+W^-→ ℓ^+ℓ^-νν̅ 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.
ER -