Study of $WW\rightarrow q\bar{q}\ell\nu$ at ILC500 with ILD

TL;DR

This paper evaluates the ILD detector's performance at the ILC500 for semileptonic WW decays, focusing on lepton identification, gamma mitigation, and precise W mass measurement using simulated Standard Model events.

Contribution

It presents a detailed simulation-based analysis of W mass measurement techniques and detector performance benchmarks at the ILC500 with the ILD detector concept.

Findings

W mass statistical error of 2.4 MeV achieved

WW cross-section relative statistical error of 0.036%

Effective lepton identification and gamma mitigation demonstrated

Abstract

This study showcases the approaches towards lepton identification and $\gamma \gamma$ mitigation at center-of-mass energy $\sqrt{s} = 500$ GeV for semileptonic WW decays at the ILC. The analysis is performed using fully simulated Standard Model Monte Carlo events with the ILD detector concept and emphasizes the measurement of the W mass. The mass measurement is performed through the identification of a lepton and treatment of the remaining system as the hadronic W-boson. Only the most favorable beam polarization scenario for WW production is considered. The resulting detector performance benchmark obtained, with an integrated luminosity of $1600$ fb$^{-1}$ , is a statistical error on the W mass of $\Delta M_{W}$ (stat.)$ = 2.4$ MeV and a relative statistical error on the WW crosssection of $\Delta \sigma/\sigma$(stat.)$ = 0.036\%$.