Neutral Higgs Boson Production at e^+e^- Colliders in the Complex MSSM: Towards the LC Precision

TL;DR

This paper provides a detailed one-loop calculation of neutral Higgs boson production cross sections at e^+e^- colliders within the complex MSSM, highlighting significant quantum corrections crucial for future precision Higgs studies.

Contribution

It offers the first comprehensive one-loop analysis of neutral Higgs production in the cMSSM, including all relevant channels and QED radiation effects.

Findings

Quantum corrections can increase cross sections by up to 50%.

Production cross sections are highly sensitive to cMSSM parameters.

Sizable deviations from tree-level predictions emphasize the need for precise calculations.

Abstract

For the search for additional Higgs bosons in the Minimal Supersymmetric Standard Model (MSSM) as well as for future precision analyses in the Higgs sector a precise knowledge of their production properties is mandatory. We review the evaluation of the cross sections for the neutral Higgs boson production at e^+e^- colliders in the MSSM with complex parameters (cMSSM). The evaluation is based on a full one-loop calculation of the production mechanisms e^+e^- -> h_i Z, h_i gamma, h_i h_j (i,j = 1,2,3), including soft and hard QED radiation. The dependence of the Higgs boson production cross sections on the relevant cMSSM parameters is analyzed numerically. We find sizable contributions to many cross sections. They are, depending on the production channel, roughly of 10-20% of the tree-level results, but can go up to 50% or higher.