https://doi.org/10.1140/epjp/s13360-026-07917-w
Regular Article
Refining two-loop corrections to trilinear Higgs couplings in the Two-Higgs-Doublet Model
Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany
a
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Received:
27
March
2026
Accepted:
2
June
2026
Published online:
14
June
2026
Abstract
The precise determination of the Higgs self-couplings is an essential task for understanding electroweak symmetry breaking and probing physics beyond the Standard Model (SM). The calculation of two-loop corrections to scalar couplings is important as it provides a critical test of the perturbative stability of the theoretical predictions, especially in scenarios with extended scalar sectors where large one-loop corrections can occur. Moreover, two-loop corrections need to be taken into account for the future perspective of precisely measuring the trilinear Higgs self-coupling. We present new results for the leading two-loop corrections to trilinear Higgs couplings in the Two-Higgs-Doublet Model (2HDM). We focus in particular on the couplings 
and 
, which are relevant for Higgs pair production at the (HL-)LHC or at future linear colliders. We address the renormalisation of the alignment limit in the Higgs basis and give some insights into technical details of the calculation. Finally, we discuss the phenomenological impact of our results on di-Higgs production differential distributions.
Felix Egle and Alain Verduras Schaeidt have contributed equally to this work.
© The Author(s) 2026
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