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A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation
by R. Gauld, U. Haisch, J. Weiss
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Submission summary
| Authors (as registered SciPost users): | Rhorry Gauld · Ulrich Haisch |
| Submission information | |
|---|---|
| Preprint Link: | scipost_202504_00013v1 (pdf) |
| Date accepted: | April 15, 2025 |
| Date submitted: | April 7, 2025, 8:27 a.m. |
| Submitted by: | Ulrich Haisch |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
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| Approach: | Phenomenological |
Abstract
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.
Author indications on fulfilling journal expectations
- Provide a novel and synergetic link between different research areas.
- Open a new pathway in an existing or a new research direction, with clear potential for multi-pronged follow-up work
- Detail a groundbreaking theoretical/experimental/computational discovery
- Present a breakthrough on a previously-identified and long-standing research stumbling block
Published as SciPost Phys. 18, 148 (2025)