Experimental methods and prospects on the measurement of electroweak $b$ and $c$-quark observables at the ILC operating at 250 GeV
Résumé
This paper describes a comprehensive experimental study on viability and prospects for the measurement of electroweak observables in $e^{+}e^{-}\rightarrow b\bar{b}$ and $e^{+}e^{-}\rightarrow c\bar{c}$ processes at the International Linear Collider (ILC) operating at 250 GeV of centre of mass energy. The ILC will produce electron and positron beams with different degrees of longitudinal polarisation (up to 80$\%$ for electrons and $30\%$ for positrons). The studies are based on a detailed simulation of the International Large Detector (ILD) concept. This will allow to inspect in detail the four independent chirality combinations of the electroweak couplings to electrons and other fermions and also perform background free analysis. The ILD design is based on the particle flow approach and the excellent vertexing and tracking capabilities, including charged hadron identification thanks to the $dE/dx$. We evaluate the main sources of experimental systematic uncertainties and identify the key design aspects of the accelerator and detector that are crucial to achieve the required per mil level accuracy that matches the expected statistical accuracy.
Mots clés
bottom: pair production
charm: pair production
polarization: longitudinal
positron: polarized beam
electron: polarized beam
ILC Coll
electroweak interaction
ILD detector
energy loss
tracking detector
hadron: particle identification
accelerator: proposed
experimental methods
error: statistical
particle flow
background
numerical calculations: Monte Carlo
250 GeV-cms
electron positron: annihilation
electron positron: colliding beams