We study the impact of the two-loop corrections controlled by the BSM Higgs couplings on the cross section for the production of a pair of SM-like Higgs bosons via gluon fusion in the aligned THDM. To this aim, we reassess the two-loop calculation of λhhh , we compute for the first time the two-loop corrections to λhhH , and we include the relevant corrections to the Higgs-gluon couplings and to the s-channel propagators entering the gg → hh amplitude. We discuss the numerical impact of the two-loop BSM contributions, first on the individual couplings and then on the prediction for the pair-production cross section, in two benchmark scenarios for the aligned THDM.
Degrassi, G., Gröber, R., Slavich, P. (2026). Two-loop BSM contributions to Higgs pair production in the aligned THDM. JOURNAL OF HIGH ENERGY PHYSICS, 2026(1) [10.1007/jhep01(2026)041].
Two-loop BSM contributions to Higgs pair production in the aligned THDM
Degrassi, Giuseppe;
2026-01-01
Abstract
We study the impact of the two-loop corrections controlled by the BSM Higgs couplings on the cross section for the production of a pair of SM-like Higgs bosons via gluon fusion in the aligned THDM. To this aim, we reassess the two-loop calculation of λhhh , we compute for the first time the two-loop corrections to λhhH , and we include the relevant corrections to the Higgs-gluon couplings and to the s-channel propagators entering the gg → hh amplitude. We discuss the numerical impact of the two-loop BSM contributions, first on the individual couplings and then on the prediction for the pair-production cross section, in two benchmark scenarios for the aligned THDM.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
