期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 8, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP08(2021)021
关键词
Beyond Standard Model; Effective Field Theories
资金
- Ministerio de Ciencia, Innovacion y Universidades, Spain [FPU18/01340]
- Agence Nationale de la Recherche (ANR) [ANR-19-CE31-0012]
- European Union [860881-HIDDeN]
- Generalitat Valenciana (Spain) through the plan GenT program [CIDEGENT/2018/014]
- Agence Nationale de la Recherche (ANR) [ANR-19-CE31-0012] Funding Source: Agence Nationale de la Recherche (ANR)
This study reveals that studying the forward-backward asymmetry A(FB) at the Z peak within the Standard Model Effective Field Theory framework provides constraints on the vertex corrections of the Z boson to quarks. The inclusion of current A(FB) data significantly improves LEP bounds even in simple New Physics setups, indicating the competitiveness and complementarity of the LHC in precision measurements of the Z boson properties.
We study the forward-backward asymmetry A(FB) in pp -> l(+)l(-) at the Z peak within the Standard Model Effective Field Theory (SMEFT). We find that this observable provides per mille level constraints on the vertex corrections of the Z boson to quarks, which close a flat direction in the electroweak precision SMEFT fit. Moreover, we show that current A(FB) data is precise enough so that its inclusion in the fit improves significantly LEP bounds even in simple New Physics setups. This demonstrates that the LHC can compete with and complement LEP when it comes to precision measurements of the Z boson properties.
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