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000602032 1001_ $$aArco, F.$$b0
000602032 245__ $$aSensitivity to triple Higgs couplings via di-Higgs production in the 2HDM at the (HL-)LHC
000602032 260__ $$aHeidelberg$$bSpringer$$c2023
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000602032 520__ $$aAn 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 \,\, \textrm{TeV}$ at next-to-leading order in the heavy top-quark limit with the code HPAIR. We investigate in particular the process $gg \rightarrow hh$, with h being the Higgs boson discovered at the LHC with a mass of about $125 \,\, \textrm{GeV}$. The top box diagram of the loop-mediated gluon fusion process into Higgs pairs interferes with the s-channel exchange of the two ${\mathcal{C}\mathcal{P}}$-even 2HDM Higgs bosons h and H. The latter two involve the triple Higgs couplings (THCs) $\lambda _{hhh}$ and $\lambda _{hhH}$, 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 $\lambda _{hhh}$ from the SM value $\lambda _{\textrm{SM}}$ and/or contributions involving $\lambda _{hhH}$. The sensitivity to the beyond-the-SM (BSM) THC $\lambda _{hhH}$ is further analyzed employing the $m_{hh}$ distributions. We demonstrate how a possible measurement of $\lambda _{hhH}$ 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.
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000602032 650_7 $$2INSPIRE$$aHiggs particle: doublet: 2
000602032 650_7 $$2INSPIRE$$apotential: Higgs
000602032 650_7 $$2INSPIRE$$acoupling: Higgs
000602032 650_7 $$2INSPIRE$$atop: coupling
000602032 650_7 $$2INSPIRE$$aHiggs particle: pair production
000602032 650_7 $$2INSPIRE$$agluon: fusion
000602032 650_7 $$2INSPIRE$$asensitivity
000602032 650_7 $$2INSPIRE$$aCERN LHC Coll: upgrade
000602032 650_7 $$2INSPIRE$$anumerical calculations
000602032 650_7 $$2INSPIRE$$anew physics
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000602032 7001_ $$0P:(DE-H253)PIP1093340$$aHeinemeyer, S.$$b1$$eCorresponding author
000602032 7001_ $$aMühlleitner, M.$$b2
000602032 7001_ $$0P:(DE-H253)PIP1102704$$aRadchenko, K.$$b3$$udesy
000602032 773__ $$0PERI:(DE-600)1459069-4$$a10.1140/epjc/s10052-023-12193-4$$gVol. 83, no. 11, p. 1019$$n11$$p1019$$tThe European physical journal / C$$v83$$x1434-6044$$y2023
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