Measurement of the forward-backward asymmetries for charm- and bottom-quark pair productions at $<\sqrt{s}>$=58GeV with electron tagging

TL;DR

This study measures the forward-backward asymmetries of charm and bottom quark pairs at 58 GeV using electron tagging, providing results consistent with the standard model predictions.

Contribution

It presents the first measurement of charm and bottom quark asymmetries at this energy with electron tagging, enhancing understanding of quark production asymmetries.

Findings

Measured asymmetries: $A_{FB}^c = -0.49 \

Measured asymmetries: $A_{FB}^b = -0.64 \

Results agree with standard model predictions.

Abstract

We have measured, with electron tagging, the forward-backward asymmetries of charm- and bottom-quark pair productions at $<\sqrt{s} >$=58.01GeV, based on 23,783 hadronic events selected from a data sample of 197pb$^{-1}$ taken with the TOPAZ detector at TRISTAN. The measured forward-backward asymmetries are $A_{FB}^c = -0.49 \pm 0.20(stat.) \pm 0.08 (sys.)$ and $A_{FB}^b = -0.64 \pm 0.35(stat.) \pm 0.13 (sys.)$, which are consistent with the standard model predictions.