Quantum effects on Higgs-strahlung events at Linear Colliders within the general 2HDM

TL;DR

This paper analyzes quantum corrections to Higgs-strahlung events at future linear colliders within the general 2HDM, highlighting large negative wave-function renormalization effects linked to triple Higgs couplings, which can help probe the Higgs sector.

Contribution

It provides the first detailed one-loop calculation of Higgs-strahlung cross-sections in the general 2HDM, emphasizing the impact of wave-function renormalization and triple Higgs couplings.

Findings

Quantum effects are large and negative around 1 and moderate 5 values.

Higgs-strahlung rates reach tens of femtobarns, yielding thousands of events.

Combined analysis with Higgs-pair production can probe the Higgs sector structure.

Abstract

The associated production of neutral Higgs bosons with the Z gauge boson is investigated in the context of the future linear colliders, such as the ILC and CLIC, within the general two-Higgs-doublet model (2HDM). We compute the corresponding production cross-sections at one-loop, in full consistency with the available theoretical and phenomenological constraints. We find that the wave-function renormalization corrections to the external Higgs fields are the dominant source of the quantum effects, which turn out to be large and negative, and located predominantly in the region around \tan\beta=1 and moderate values of the parameter \lambda_5 (being \lambda_5 < 0). This behavior can be ultimately traced back to the enhancement potential of the triple Higgs boson self-couplings, a trademark feature of the 2HDM with no counterpart in the Higgs sector of the Minimal Supersymmetric Standard Model. The predicted Higgs-strahlung rates comfortably reach a few tens of femtobarn, which means barely 10^3 - 10^4 events per 500 inverse femtobarn of integrated luminosity. Due to their great complementarity, we argue that the combined analysis of the Higgs-strahlung events and the previously computed one-loop Higgs-pair production processes could be instrumental to probe the structure of the Higgs sector at future linac facilities.