Measurement of the cross-section and forward-backward charge asymmetry for the b and c-quark in e+e- annihilation with inclusive muons at sqrt(s) = 58 GeV

TL;DR

This study measures the production cross-sections and forward-backward charge asymmetries of b and c quarks in electron-positron collisions at 58 GeV using inclusive muons, providing results consistent with the Standard Model.

Contribution

First measurement of b and c quark cross-sections and asymmetries at 58 GeV using inclusive muons with detailed analysis and comparison to Standard Model predictions.

Findings

Measured R_bb = 0.13+-0.02(stat)+-0.01(syst)

Measured R_cc = 0.36+-0.05(stat)+-0.05(syst)

Measured A^b_FB = -0.20+-0.16(stat)+-0.01(syst)

Abstract

We have studied inclusive muon events using all the data collected by the TOPAZ detector at sqrt(s)=58 GeV with an integrated luminosity of 273pb-1. From 1328 inclusive muon events, we measured the ratio R_qq of the cross section for qq-bar production to the total hadronic cross section and forward-backward asymmetry A^q_FB for b and c quarks. The obtained results are R_bb = 0.13+-0.02(stat)+-0.01(syst), R_cc = 0.36+-0.05(stat)+-0.05(syst), A^b_FB = -0.20+-0.16(stat)+-0.01(syst) and A^c_FB = -0.17+-0.14(stat)+-0.02(syst), in fair agreement with a prediction of the standard model.