Measurement of the Higgs Boson Mass with a Linear e+e- Collider

TL;DR

This study evaluates the precision of Higgs boson mass measurement at a 350 GeV linear e+e- collider, considering statistical and systematic uncertainties, and finds that controlling beam energy systematics is crucial for accurate results.

Contribution

It provides detailed estimates of Higgs mass measurement precision and analyzes the impact of beam-related systematics at a future linear collider.

Findings

Mass measurement uncertainties are 40, 65, and 70 MeV for Higgs masses of 120, 150, and 180 GeV.

Systematic uncertainties must be controlled below 10^-4 in beam energy measurement.

Beam energy systematics significantly influence the overall measurement precision.

Abstract

The potential of a linear e+e- collider operated at a centre-of-mass energy of 350 GeV is studied for the measurement of the Higgs boson mass. An integrated luminosity of 500 fb-1 is assumed. For Higgs boson masses of 120, 150 and 180 GeV the uncertainty on the Higgs boson mass measurement is estimated to be 40, 65 and 70 MeV, respectively. The effects of beam related systematics, namely a bias in the beam energy measurement, the beam energy spread and the luminosity spectrum due to beamstrahlung, on the precision of the Higgs boson mass measurement are investigated. In order to keep the systematic uncertainty on the Higgs boson mass well below the level of the statistical error, the beam energy measurement must be controlled with a relative precision better than 10-4.