Production and measurement of $e^{+}e^{-}\rightarrow c\bar{c}$ signatures at the 250 GeV ILC

TL;DR

This paper evaluates the experimental prospects for measuring the cross section and asymmetry of charm quark pair production at 250 GeV at the ILC, highlighting the potential to detect new physics beyond the standard model.

Contribution

It presents the first detailed analysis of measuring $e^{+}e^{-} ightarrow c\bar{c}$ signatures at the ILC, including charge determination techniques and sensitivity to new physics with polarized beams.

Findings

High-precision measurement of charm production cross section and asymmetry.

Sensitivity to beyond standard model resonances up to several tens of TeV.

Effective separation of electroweak coupling chirality states.

Abstract

This document discusses for the first time the experimental prospects on the measurement of cross section and the forward-backward asymmetry in $e^{-}e^{+}\rightarrow c\bar{c}$ collisions at 250 GeV at the International Linear Collider operating polarised beams. The cross section will be normalised to the total hadronic cross section. We discuss the results for an analysis assuming the integrated luminosity of 2000 fb$^{-1}$ foreseen in the baseline project. The measurement requires determining the charge of both jets identified as originated by a $c$-quark. The charge measurement is optimally performed using the precise micro-vertex detector of the detector ILD and the charged kaon identification provided by the $\frac{dE}{dx}$ information of its TPC. Thanks to the beam polarisation, we can separate the four independent chirality combinations of the electroweak couplings, enhancing in this way the sensitivity to new physics effects. We show that due to the unprecedented precision that will be achieved by the ILC for these observables, the ILC will be sensitive to the existence of beyond the standard model Randal Sundrum resonances of several tens of TeV.