A Study of the Impact of High Cross Section ILC Processes on the SiD Detector Design

TL;DR

This paper investigates how high cross section processes at the ILC affect the SiD detector design, focusing on background impacts and geometry variations to optimize detector performance.

Contribution

It analyzes the effects of beam-induced backgrounds on SiD components using simulations, exploring different BeamCal geometries and interaction region configurations.

Findings

Background from pair production impacts detector components

BeamCal geometry variations influence background interception

Optimized configurations improve detector hermeticity and sensitivity

Abstract

The SiD concept is one of two proposed detectors to be mounted at the interaction region of the International Linear Collider (ILC). A substantial ILC background arises from low transverse momentum $\mathrm{e}^{+}\mathrm{e}^{-}$ pairs created by the interaction of the colliding beams' electromagnetic fields. In order to provide hermeticity and sensitivity to beam targeting parameters, a forward Beamline Calorimeter (BeamCal) is being designed that will provide coverage down to 5 mrad from the outgoing beam trajectory, and intercept the majority of this pair background. Using the SiD simulation framework, the effect of this pair background on the SiD detector components, especially the vertex detector (VXD) and forward electromagnetic calorimeter (FCAL), is explored. In the case of the FCAL, backgrounds from Bhabha and two-photon processes are also considered. The consequence of several variants of the BeamCal geometry and ILC interaction region configuration are considered for both the vertex detector and BeamCal performance.