https://doi.org/10.1140/epjc/s10052-026-15673-5
Regular Article - Theoretical Physics
Light neutral Higgs-boson production at 
colliders in the complex MSSM and NMSSM: a full one-loop analysis
1
Instituto de Física Teórica (UAM/CSIC), Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain
2
Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, Sommerfeldstraße 16, 52074, Aachen, Germany
3
Institut für Theoretische Physik, Karlsruhe Institute of Technology, 76128, Karlsruhe, Germany
a
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Received:
21
July
2025
Accepted:
7
April
2026
Published online:
29
April
2026
Abstract
For future precision analyses of the Higgs boson at 
, 
, a precise knowledge of its production and decay properties is mandatory. While in the Standard Model (SM) these calculations are quite advanced, in many models beyond the SM (BSM) a precise calculation is missing so far. We present the calculation of the Higgs-strahlung cross-sections at colliders for the light neutral Higgs boson production in the next-to-minimal supersymmetric SM (NMSSM) with complex parameters (cNMSSM). The evaluation is based on a full one-loop calculation of the production mechanism 
, including soft, hard, and collinear photon radiation. The dependence of the Higgs boson production cross-sections on the relevant cNMSSM parameters is analyzed numerically. In certain scenarios we find sizable corrections to the Higgs-strahlung cross-section. Normally, they reach about 
of the tree-level results, but can also exceed 20%. Finally, the calculation is compared to the corresponding one in the Minimal Supersymmetric SM (MSSM). The knowledge of the full one-loop contributions to the Higgs-boson production is particularly important for a sound theoretical interpretation of measurements at future colliders such as the ILC, CLIC, LCF, FCC-ee, or CEPC. It is planned to implement the evaluation of the Higgs boson production cross-sections into an add-on package to the code FeynHiggs.
Former address: S. Passehr, C. Schappacher.
© The Author(s) 2026
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