International Workshop on Future Linear Colliders, LCWS2021

Forward-backward asymmetries of heavy quark pair production in e+e− collisions at αs2

15 Mar 2021, 22:30

20m

Online Conference (Zoom)

PD1: Theoretical Developments PD1: Theoretical Developments

Speaker

Dr Long Chen (RWTH Aachen University)

Description

In this talk, I will discuss a computational set-up for calculating the production of a massive quark-antiquark pair in $e^{+}{e}^{-}$ collisions at order ${\alpha }_s^2$ in the coupling of quantum chromodynamics (QCD) at the differential level by means of the antenna subtraction method.
Theoretical predictions on the production of top quark pairs in the continuum, and the bottom quark pairs at the Z-boson resonance, will be reported.
In particular, I will focus on the order ${\alpha }_s^2$ QCD corrections to the heavy quark forward-backward asymmetry ($A_{FB}$) in $e^{+}{e}^{-}$ collisions.
In the case of the $A_{FB}$ of bottom quarks at the Z-boson resonance, the QCD corrections are determined with respect to both the bottom quark axis and the thrust axis.
I will also briefly discuss improvements on these QCD corrections by applying the scale-optimization procedure based on the Principle of Maximum Conformality.

Presentation materials

LCWS2021_Chen.pdf