%0 Electronic Article
%A Arco, F.
%A Heinemeyer, S.
%A Mühlleitner, M.
%A Radchenko Serdula, Kateryna
%T Sensitivity to Triple Higgs Couplings via Di-Higgs Production in the 2HDM at the (HL-)LHC
%N DESY-22-203
%M PUBDB-2022-07759
%M DESY-22-203
%M arXiv:2212.11242
%M IFT-UAM/CSIC-22-073
%M KA-TP-30-2022
%D 2022
%Z 43 pages, 26 figures
%X An important task of the LHC is the investigation of the Higgs-boson sector. Of particular interest is the reconstruction of the Higgs potential, i.e. the measurement of the Higgs self-couplings. Based on previous analyses, within the 2HDMs type I and II, we analyze several two-dimensional benchmark planes that are over large parts in agreement with all theoretical and experimental constraints. For these planes we evaluate di-Higgs production cross sections at the (HL-)LHC with a center-of-mass energy of 13 TeV at NLO in the heavy top-quark limit with the code HPAIR. We investige in particular the process gg → hh, with h being the Higgs boson discovered at the LHC with a mass of about 125 GeV. The top box diagram of the loop-mediated gluon fusion process into Higgs pairs interferes with the s-channel exchange of the two CP-even 2HDM Higgs bosons h and H involving the trilinear couplings λ<sub>hhh</sub> and λ<sub>hhH</sub>, respectively. Depending on the size of the involved top-Yukawa and triple Higgs couplings as well as on the mass of H, the contribution of the s-channel H diagram can be dominating or be highly suppressed. We find regions of the allowed parameter space in which the di-Higgs production cross section can differ by many standard deviations from its SM prediction, indicating possible access to deviations in λ<sub>hhh</sub> from the SM value λ<sub>SM</sub> and/or contributions involving λ<sub>hhH</sub>. The sensitivity to λ<sub>hhH</sub> is further analyzed employing the m<sub>hh</sub> distributions. We demonstrate how a possible measurement of λ<sub>hhH</sub> depends on the various experimenal uncertainties. Depending on the underlying parameter space, the HL-LHC may have the option not only to detect beyond-the-Standard-Model triple Higgs couplings, but also to provide a first rough measurement of their sizes.
%K coupling, Higgs (INSPIRE)
%K gluon, fusion (INSPIRE)
%K potential, Higgs (INSPIRE)
%K dimension, 2 (INSPIRE)
%K CERN LHC Coll, upgrade (INSPIRE)
%K Higgs particle (INSPIRE)
%K sensitivity (INSPIRE)
%K new physics (INSPIRE)
%K GeV (INSPIRE)
%K benchmark (INSPIRE)
%K suppression (INSPIRE)
%K TeV (INSPIRE)
%F PUB:(DE-HGF)25
%9 Preprint
%R 10.3204/PUBDB-2022-07759
%U https://bib-pubdb1.desy.de/record/490453