Light Higgs-boson production at the Photon Collider at TESLA with an improved background analysis

TL;DR

This paper evaluates the precision measurement of the Higgs boson's two-photon decay mode at TESLA's Photon Collider, incorporating advanced background analysis and realistic detector effects.

Contribution

It introduces an improved background analysis including NLO estimation, overlaying events, and realistic b-tagging for Higgs measurements at TESLA.

Findings

Gamma(h -> gamma gamma)Br(h -> b bbar) measurable with 2-7% accuracy

Effective background suppression techniques demonstrated

Feasibility of precise Higgs coupling measurements confirmed

Abstract

Measurement of the Gamma(h -> gamma gamma)Br(h -> b bbar) at the Photon Collider at TESLA is studied for the Standard Model Higgs boson with mass of 120 to 160 GeV. The NLO estimation of background, analysis of overlaying events, realistic b-tagging and corrections for escaping neutrinos were performed. We find that for M_h = 120-160 GeV the Gamma(h -> gamma gamma)Br(h -> b bbar) can be measured with a statistical accuracy of 2-7% after one year of the Photon Collider running.