Supersymmetric electroweak corrections to t bar{t} h associated production at e+e- colliders

TL;DR

This paper calculates electroweak corrections to Higgs production with top quark pairs at e+e- colliders across different models, showing corrections can significantly impact cross sections, especially in the MSSM.

Contribution

It provides the first detailed calculation of electroweak corrections of order ${ m O}(rac{ ext{mass}^2}{m_w^2})$ and ${ m O}(rac{ ext{mass}^3}{m_w^3})$ for Higgs associated production in SM, 2HDM, and MSSM.

Findings

Corrections are a few percent generally, over ten percent in MSSM for favorable parameters.

Maximum cross sections near 700 GeV are 2.8 fb (SM), 2.7 fb (2HDM), 2.5 fb (MSSM).

Electroweak corrections significantly affect predicted production rates.

Abstract

The electroweak corrections of order ${\cal O}(\alpha_{\rm em} m^2_{t,b}/m^2_w)$ and ${\cal O}(\alpha_{\rm em} m^3_{t,b}/m^3_w)$ to Higgs boson associated production with top quark pair are calculated at $e^+e^-$ colliders in the standard model (SM), the two-Higgs-doublet model (2HDM) and the minimal supersymmetric standard model (MSSM). These corrections are a few percent in general, and in the MSSM they can be over ten percent for favorable parameter values allowing by current precise experiments. The total cross sections including the electroweak corrections get their maximal near $\sqrt{s} = 700$GeV, and can reach 2.8 fb, 2.7 fb and 2.5 fb in the SM, the 2HDM and the MSSM, respectively.