ILC Workshop on Potential Experiments (ILCX2021)

Precision Z physics at the LHC in the flavorful SMEFT

29 Oct 2021, 13:46

16m

Room #2 (Zoom Meeting ID: 823 6921 2312)

J: Global interpretations

Speaker

Victor Breso (IFIC)

Description

We study the forward-backward asymmetry $A_{FB}$ in $pp\to l^{+}{l}^{-}$ 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.

Presentation materials

slides AFB ILC.pdf