Dimension-8 operators in W + W − production via gluon fusion
Abstract We investigate the impact of dimension-8 operators on W + W − production at the LHC for the incoming gluon-gluon channel. To this end, we have identified all dimension-8 CP-even operators contributing to the process in question, and computed the corresponding tree-level helicity amplitudes...
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| Format: | Article |
| Language: | English |
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SpringerOpen
2025-06-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP06(2025)111 |
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| author | Daniel Gillies Andrea Banfi Adam Martin Matthew A. Lim |
| author_facet | Daniel Gillies Andrea Banfi Adam Martin Matthew A. Lim |
| author_sort | Daniel Gillies |
| collection | DOAJ |
| description | Abstract We investigate the impact of dimension-8 operators on W + W − production at the LHC for the incoming gluon-gluon channel. To this end, we have identified all dimension-8 CP-even operators contributing to the process in question, and computed the corresponding tree-level helicity amplitudes for fully-leptonic decays of the W bosons. These are implemented in the program MCFM-RE, which automatically incorporates the effect of a jet-veto to reduce the otherwise overwhelming t t ¯ $$ t\overline{t} $$ background. We find that, unless we break the hierarchy of the effective field theory (EFT), the interference of the dimension-8 operators with the Standard Model is negligible across the considered distributions. This justifies including the square of dimension-6 operators when performing EFT fits with this channel. We then present new constraints on CP-even and CP-odd dimension-6 operators within the EFT regime. Lastly, we postulate a scenario in which the hierarchy of the EFT is broken, justified by the strong constraints on dimension-6 operators from existing on-shell Higgs data. In this scenario, we discuss the constraints that can be reasonably set on CP-even dimension-8 operators with current and future data. We remark that the effect of the jet-veto on the ability to constrain new physics in the W + W − channel is quite dramatic and must be properly taken into account. |
| format | Article |
| id | doaj-art-87fb68cef6ce4e98b78b3472b2a126ec |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-87fb68cef6ce4e98b78b3472b2a126ec2025-08-20T03:45:44ZengSpringerOpenJournal of High Energy Physics1029-84792025-06-012025614010.1007/JHEP06(2025)111Dimension-8 operators in W + W − production via gluon fusionDaniel Gillies0Andrea Banfi1Adam Martin2Matthew A. Lim3Department of Physics and Astronomy, University of SussexDepartment of Physics and Astronomy, University of SussexDepartment of Physics, University of Notre DameDepartment of Physics and Astronomy, University of SussexAbstract We investigate the impact of dimension-8 operators on W + W − production at the LHC for the incoming gluon-gluon channel. To this end, we have identified all dimension-8 CP-even operators contributing to the process in question, and computed the corresponding tree-level helicity amplitudes for fully-leptonic decays of the W bosons. These are implemented in the program MCFM-RE, which automatically incorporates the effect of a jet-veto to reduce the otherwise overwhelming t t ¯ $$ t\overline{t} $$ background. We find that, unless we break the hierarchy of the effective field theory (EFT), the interference of the dimension-8 operators with the Standard Model is negligible across the considered distributions. This justifies including the square of dimension-6 operators when performing EFT fits with this channel. We then present new constraints on CP-even and CP-odd dimension-6 operators within the EFT regime. Lastly, we postulate a scenario in which the hierarchy of the EFT is broken, justified by the strong constraints on dimension-6 operators from existing on-shell Higgs data. In this scenario, we discuss the constraints that can be reasonably set on CP-even dimension-8 operators with current and future data. We remark that the effect of the jet-veto on the ability to constrain new physics in the W + W − channel is quite dramatic and must be properly taken into account.https://doi.org/10.1007/JHEP06(2025)111SMEFTElectroweak Precision PhysicsHigher-Order Perturbative CalculationsResummation |
| spellingShingle | Daniel Gillies Andrea Banfi Adam Martin Matthew A. Lim Dimension-8 operators in W + W − production via gluon fusion Journal of High Energy Physics SMEFT Electroweak Precision Physics Higher-Order Perturbative Calculations Resummation |
| title | Dimension-8 operators in W + W − production via gluon fusion |
| title_full | Dimension-8 operators in W + W − production via gluon fusion |
| title_fullStr | Dimension-8 operators in W + W − production via gluon fusion |
| title_full_unstemmed | Dimension-8 operators in W + W − production via gluon fusion |
| title_short | Dimension-8 operators in W + W − production via gluon fusion |
| title_sort | dimension 8 operators in w w production via gluon fusion |
| topic | SMEFT Electroweak Precision Physics Higher-Order Perturbative Calculations Resummation |
| url | https://doi.org/10.1007/JHEP06(2025)111 |
| work_keys_str_mv | AT danielgillies dimension8operatorsinwwproductionviagluonfusion AT andreabanfi dimension8operatorsinwwproductionviagluonfusion AT adammartin dimension8operatorsinwwproductionviagluonfusion AT matthewalim dimension8operatorsinwwproductionviagluonfusion |