TY  - EJOUR
AU  - Braathen, Johannes
AU  - Heinemeyer, Sven
AU  - Parra Arnay, Andrea
AU  - Verduras Schaeidt, Alain
TI  - Impact of one-loop corrections to trilinear scalar couplings on di-Higgs production in the RxSM
IS  - DESY-25-092
M1  - PUBDB-2025-02058
M1  - DESY-25-092
M1  - arXiv:2507.02569
M1  - IFT-AM/CSIC-25-071
PY  - 2025
N1  - 47 pages, 17 figures
AB  - We investigate di-Higgs production at the (HL-)LHC and possible high-energy future e<sup>+</sup>e<sup>−</sup> colliders within the real Higgs singlet extension of the Standard Model (SM), the RxSM. This model has two CP-even Higgs bosons, h and H, for which we assume m<sub>h</sub> ∼ 125 \text GeV  <  m<sub>H</sub>. We analyse the effect of one-loop corrections to the two trilinear scalar couplings relevant for di-Higgs production, λ<sub>hhh</sub> and λ<sub>hhH</sub>, by performing an extensive parameter scan within the RxSM. We find that the one-loop corrections have a strong impact on the total production cross-sections, as well as on the differential cross-sections with respect to the invariant di-Higgs mass, m<sub>hh</sub>. We evaluate the sensitivity of the HL-LHC and a high-energy e<sup>+</sup>e<sup>−</sup> collider with √s = 1 \text TeV, the ILC1000, to probe BSM physics effects in these processes. We demonstrate that the RxSM can be distinguished from the SM for large parts of the sampled parameter space. The resonant H structure in the m<sub>hh</sub> distribution, on the other hand, can be observed only if the corresponding couplings, in particular λ<sub>hhH</sub>, are sufficiently large. Here the ILC1000 yields a substantially better sensitivity than the HL-LHC.
LB  - PUB:(DE-HGF)25
DO  - DOI:10.3204/PUBDB-2025-02058
UR  - https://bib-pubdb1.desy.de/record/631546
ER  -