Determination of tan(beta) from the Higgs boson decay at linear colliders

TL;DR

This paper explores how accurately the parameter tan(beta) in the two Higgs doublet model can be measured at linear colliders by analyzing the decay branching ratios of the SM-like Higgs boson, offering a potentially superior method compared to direct production of additional Higgs bosons.

Contribution

It demonstrates that precision measurements of Higgs decay branching ratios at linear colliders can effectively determine tan(beta), especially when deviations from the Standard Model are observed.

Findings

Precision in tan(beta) measurement depends on Yukawa interaction type.

Decay branching ratios can be measured accurately at linear colliders.

Method may outperform direct production approaches in certain scenarios.

Abstract

In the two Higgs doublet model, $\tan\beta$ is an important parameter, which is defined as the ratio of the vacuum expectation values of the doublets. We study how accurately $\tan\beta$ can be determined at linear colliders via the precision measurement of the decay branching fraction of the standard model (SM) like Higgs boson. Since the effective coupling constants of the Higgs boson with the weak gauge bosons are expected to be measured accurately, the branching ratios can be precisely determined. Consequently, $\tan\beta$ can be determined with a certain amount of accuracy. Comparing the method to those using direct production of the additional Higgs bosons, we find that, depending on the type of Yukawa interactions, the precision measurement of the decay of the SM-like Higgs boson can be the best way to determine $\tan\beta$, when the deviations in the coupling constants with the gauge boson from the SM prediction are observed at linear colliders.