A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation
We derive constraints on dimension-six light-quark dipole operators within the Standard Model (SM) effective field theory, based on measurements of $Z$ production at SLC and LEP, as well as $Z$+jet production at the LHC. Our new constraints exclude the parameter space that could potentially explain...
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| Language: | English |
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2025-05-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.18.5.148 |
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| author | Rhorry Gauld, Ulrich Haisch, Joachim Weiss |
| author_facet | Rhorry Gauld, Ulrich Haisch, Joachim Weiss |
| author_sort | Rhorry Gauld, Ulrich Haisch, Joachim Weiss |
| collection | DOAJ |
| description | We derive constraints on dimension-six light-quark dipole operators within the Standard Model (SM) effective field theory, based on measurements of $Z$ production at SLC and LEP, as well as $Z$+jet production at the LHC. Our new constraints exclude the parameter space that could potentially explain the observed discrepancy between theoretical predictions and experimental data for the Lam-Tung relation. With these updated limits, we model-independently determine the maximum possible influence that beyond-SM contributions could have on the angular coefficients $A_0$ and $A_2$, which enter the Lam-Tung relation. |
| format | Article |
| id | doaj-art-2eb59b90e48442c48b60a344b9155e0c |
| institution | OA Journals |
| issn | 2542-4653 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics |
| spelling | doaj-art-2eb59b90e48442c48b60a344b9155e0c2025-08-20T02:15:54ZengSciPostSciPost Physics2542-46532025-05-0118514810.21468/SciPostPhys.18.5.148A tale of $Z$+jet: SMEFT effects and the Lam-Tung relationRhorry Gauld, Ulrich Haisch, Joachim WeissWe derive constraints on dimension-six light-quark dipole operators within the Standard Model (SM) effective field theory, based on measurements of $Z$ production at SLC and LEP, as well as $Z$+jet production at the LHC. Our new constraints exclude the parameter space that could potentially explain the observed discrepancy between theoretical predictions and experimental data for the Lam-Tung relation. With these updated limits, we model-independently determine the maximum possible influence that beyond-SM contributions could have on the angular coefficients $A_0$ and $A_2$, which enter the Lam-Tung relation.https://scipost.org/SciPostPhys.18.5.148 |
| spellingShingle | Rhorry Gauld, Ulrich Haisch, Joachim Weiss A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation SciPost Physics |
| title | A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation |
| title_full | A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation |
| title_fullStr | A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation |
| title_full_unstemmed | A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation |
| title_short | A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation |
| title_sort | tale of z jet smeft effects and the lam tung relation |
| url | https://scipost.org/SciPostPhys.18.5.148 |
| work_keys_str_mv | AT rhorrygauldulrichhaischjoachimweiss ataleofzjetsmefteffectsandthelamtungrelation AT rhorrygauldulrichhaischjoachimweiss taleofzjetsmefteffectsandthelamtungrelation |