Two-photon width of the Higgs boson

TL;DR

This paper evaluates the precision of measuring the Higgs boson's two-photon partial width times its branching ratio at a photon collider, demonstrating a potential 1.7% measurement accuracy with specific collider parameters.

Contribution

It presents a detailed analysis of Higgs event reconstruction at a photon collider to estimate measurement precision of the Higgs two-photon width, a novel approach for this collider type.

Findings

Achieves a 1.7% statistical error in measuring the Higgs two-photon width times branching ratio.

Uses gamma gamma -> h process and Higgs decay to b bbar for event reconstruction.

Demonstrates the feasibility of precise Higgs measurements at photon colliders.

Abstract

This study investigates the potential of a photon collider for measuring the two photon partial width times the branching ratio of a light Higgs boson. The analysis is based on the reconstruction of the Higgs events produced in the gamma gamma -> h process, followed by Higgs decay into a b bbar pair. A statistical error of the measurement of the two-photon width times the b bbar branching ratio of the Higgs boson is found to be 1.7% with an integrated luminosity of 80 fb^-1 in the high energy part of the spectrum.