Quarkonium Parton Shower in Herwig 7
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866908482458877952 |
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| author | Masouminia, M. R. Richardson, P. |
| author_facet | Masouminia, M. R. Richardson, P. |
| contents | We present the implementation of a fully automated quarkonium parton shower in Herwig 7, based on non-relativistic QCD (NRQCD) factorisation with spin-colour projections. The framework systematically incorporates colour-singlet and colour-octet production mechanisms, gluon fragmentation, and diquark production processes. Perturbative short-distance coefficients are combined with non-perturbative NRQCD matrix elements to simulate heavy-quark bound state formation. Splitting functions for $S$-, $P$- and $D$-wave states are explicitly derived and integrated into the angular-ordered shower evolution. The implementation preserves spin correlations and polarisation effects while accurately accounting for feed-down contributions. Results demonstrate improved agreement with the existing LHC data. This quarkonium parton shower will become publicly available with the release of Herwig-7.4.0. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_06307 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quarkonium Parton Shower in Herwig 7 Masouminia, M. R. Richardson, P. High Energy Physics - Phenomenology We present the implementation of a fully automated quarkonium parton shower in Herwig 7, based on non-relativistic QCD (NRQCD) factorisation with spin-colour projections. The framework systematically incorporates colour-singlet and colour-octet production mechanisms, gluon fragmentation, and diquark production processes. Perturbative short-distance coefficients are combined with non-perturbative NRQCD matrix elements to simulate heavy-quark bound state formation. Splitting functions for $S$-, $P$- and $D$-wave states are explicitly derived and integrated into the angular-ordered shower evolution. The implementation preserves spin correlations and polarisation effects while accurately accounting for feed-down contributions. Results demonstrate improved agreement with the existing LHC data. This quarkonium parton shower will become publicly available with the release of Herwig-7.4.0. |
| title | Quarkonium Parton Shower in Herwig 7 |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2508.06307 |