TY  - JOUR
AU  - Arco, F.
AU  - Heinemeyer, S.
AU  - Mühlleitner, M.
AU  - Radchenko, K.
TI  - Sensitivity to triple Higgs couplings via di-Higgs production in the 2HDM at the (HL-)LHC
JO  - The European physical journal / C
VL  - 83
IS  - 11
SN  - 1434-6044
CY  - Heidelberg
PB  - Springer
M1  - PUBDB-2024-00480
M1  - arXiv:2212.11242
M1  - DESY-22-203
M1  - IFT-UAM/CSIC-22-073
M1  - KA-TP-30-2022
SP  - 1019
PY  - 2023
N1  - 43 pages, 26 figures
AB  - 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 2-Higgs-Doublet Model (2HDM) type I, 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 14   TeV at next-to-leading order in the heavy top-quark limit with the code HPAIR. We investigate 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 <i>C</i><i>P</i>-even 2HDM Higgs bosons h and H. The latter two involve the triple Higgs couplings (THCs) λ<sub>hhh</sub> and λ<sub>hhH</sub>, respectively, possibly making them accessible at the HL-LHC. Depending on the size of the involved top-Yukawa and THCs 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 the beyond-the-SM (BSM) THC 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 experimental uncertainties. Depending on the underlying parameter space, the HL-LHC may have the option not only to detect BSM THCs, but also to provide a first rough measurement of their sizes.
KW  - Higgs particle: doublet: 2 (INSPIRE)
KW  - potential: Higgs (INSPIRE)
KW  - coupling: Higgs (INSPIRE)
KW  - top: coupling (INSPIRE)
KW  - Higgs particle: pair production (INSPIRE)
KW  - gluon: fusion (INSPIRE)
KW  - sensitivity (INSPIRE)
KW  - CERN LHC Coll: upgrade (INSPIRE)
KW  - numerical calculations (INSPIRE)
KW  - new physics (INSPIRE)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:001100008300001
DO  - DOI:10.1140/epjc/s10052-023-12193-4
UR  - https://bib-pubdb1.desy.de/record/602032
ER  -