Logarithmically-accurate and positive-definite NLO shower matching
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866908666171490304 |
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| author | van Beekveld, Melissa Ravasio, Silvia Ferrario Helliwell, Jack Karlberg, Alexander Salam, Gavin P. Scyboz, Ludovic Soto-Ontoso, Alba Soyez, Gregory Zanoli, Silvia |
| author_facet | van Beekveld, Melissa Ravasio, Silvia Ferrario Helliwell, Jack Karlberg, Alexander Salam, Gavin P. Scyboz, Ludovic Soto-Ontoso, Alba Soyez, Gregory Zanoli, Silvia |
| contents | We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in $pp$ collisions, as well as DIS and $e^+e^-$ to jets. The methods include adaptations of existing approaches, as well as a new NLO matching scheme, ESME, that is positive-definite by construction. Our implementations of the methods within the PanScales framework yield highly competitive NLO event generation speeds. We validate the fixed-order and combined resummation accuracy with tests in the limit of small QCD coupling and briefly touch on phenomenological comparisons to standard NLO results and to Drell-Yan data. The progress reported here is an essential step towards showers with logarithmic accuracy beyond NLL for processes with incoming hadrons. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_05377 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Logarithmically-accurate and positive-definite NLO shower matching van Beekveld, Melissa Ravasio, Silvia Ferrario Helliwell, Jack Karlberg, Alexander Salam, Gavin P. Scyboz, Ludovic Soto-Ontoso, Alba Soyez, Gregory Zanoli, Silvia High Energy Physics - Phenomenology We present methods to achieve NLL+NLO accurate parton showering for processes with two coloured legs: neutral- and charged-current Drell-Yan, and Higgs production in $pp$ collisions, as well as DIS and $e^+e^-$ to jets. The methods include adaptations of existing approaches, as well as a new NLO matching scheme, ESME, that is positive-definite by construction. Our implementations of the methods within the PanScales framework yield highly competitive NLO event generation speeds. We validate the fixed-order and combined resummation accuracy with tests in the limit of small QCD coupling and briefly touch on phenomenological comparisons to standard NLO results and to Drell-Yan data. The progress reported here is an essential step towards showers with logarithmic accuracy beyond NLL for processes with incoming hadrons. |
| title | Logarithmically-accurate and positive-definite NLO shower matching |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2504.05377 |