TY  - JOUR
AU  - Breso-Pla, V.
AU  - Falkowski, A.
AU  - Gonzalez-Alonso, M.
PY  - 2021
DA  - 2021//
TI  - A(FB) in the SMEFT: precision Z physics at the LHC
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 021
EP  - 27pp
VL  - 08
IS  - 8
PB  - Springer
KW  - Beyond Standard Model
KW  - Effective Field Theories
AB  - 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.
SN  - 1029-8479
UR  - https://arxiv.org/abs/2103.12074
UR  - https://doi.org/10.1007/JHEP08(2021)021
DO  - 10.1007/JHEP08(2021)021
LA  - English
N1  - WOS:000683833600002
ID  - Breso-Pla_etal2021
ER  -