Loading...
Integrated Luminosity with 100 ppm Precision, Methods for √s Precision of 1 ppm, and Beyond Standard Model Sensitivity using Photonic Events, at e⁺e⁻ Higgs Factories
Madison, Brendon Cory
Madison, Brendon Cory
Citations
Altmetric:
Abstract
Future electron−positron (e⁺e⁻) colliders, operating as Higgs factories or Z factories, promise unprecedented precision electroweak measurements that are vital to testing the Standard Model (SM) and exploring physics beyond it. Here we present work on the precision of integrated luminosity and center−of−mass energy, measurements that are needed to make future precision measurements possible. We also conduct these studies for the International Linear Collider (ILC) at center−of−mass energies (√s) from the Z pole (m_Z) to 1~TeV to provide a comprehensive study of these issues for future e⁺e⁻ colliders. Multiple paths to 100 parts−per−million (ppm) precision on integrated luminosity are presented, with focus on small−angle Bhabha scattering (SABS) and two−photon production (diphotons, γγ). Previous studies found that beam deflection of SABS events introduce biases on integrated luminosity of 10⁻². To address this, we present a novel method that uses Møller scattering with SABS to measure beam deflection and minimize the effects of it on integrated luminosity. We present a proposal for a Highly Granular Luminosity Calorimeter, the GLIP LumiCal, and its design considerations. We demonstrate that the GLIP LumiCal can achieve ≈35 ppm precision on integrated luminosity precision with γγ for all values of √s and that the current LumiCal design is insufficient for reaching 1000 ppm. Multiple methods for precision √s estimation are presented. We introduce the use of Kernel Density Estimation (KDE) to ensure that √s is measured accurately and precisely. The GLIP LumiCal allows for precise measurement of diphoton energies, adding an additional precision √s measurement method and tool for precision energy scale calibration of the LumiCal. We find that γγ can achieve √s precision of ∼1 ppm at various center−of−mass energies, assuming one calibrates the LumiCal to the √s estimate of tracker dimuons. The utility of photon measurements is extended to photon with invisible (X⁰γ) events where we demonstrate a model−independent method to probe neutrino couplings and constrain Beyond Standard Model (BSM) physics.
Description
Date
2025-01-01
Journal Title
Journal ISSN
Volume Title
Publisher
University of Kansas
Collections
Archive Status
This item contains archived web content.
Files
Madison_ku_0099D_20122.pdf
Adobe PDF, 17.02 MB
- Embargoed until 2176-05-31
Research Projects
Organizational Units
Journal Issue
Keywords
Particle physics, Physics, Higgs factory, Luminosity, Precision