Center-of-mass energy determination using $e^+e^-$ to $\mu^+\mu^-$ $(\gamma)$ events at future $e^+e^-$ colliders
Abstract
Methods for measuring the absolute center-of-mass energy, , and its distribution, are investigated for future Higgs-factory colliders using in situ collisions. We emphasize the potential of an estimator based on the measurement of muon momenta that we denote . It can be determined with high precision in to () events while being sensitive to effects from beam energy spread, beamstrahlung, initial-state radiation (ISR), final-state radiation (FSR), crossing angle, and detector resolution. The measurement precision is enabled by a high-precision low-mass tracker; the reported performance estimates are based on full simulation of the tracker response of the ILD detector concept for the ILC operating at GeV. The underlying statistical precision is 1.9 ppm for a 2.0 ab dataset at ILC. The ultimate utility will depend largely on how well one can calibrate and maintain the tracker momentum scale.
Keywords
Cite
@article{arxiv.2209.03281,
title = {Center-of-mass energy determination using $e^+e^-$ to $\mu^+\mu^-$ $(\gamma)$ events at future $e^+e^-$ colliders},
author = {Brendon Madison and Graham W. Wilson},
journal= {arXiv preprint arXiv:2209.03281},
year = {2022}
}
Comments
30 pages; Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021). v3 correct scaling formula in footnote 1 and add corresponding reference