Signature of the maximally symmetric 2HDM via W±/Z-quadruplet productions at the LHC

We consider the maximally symmetric two-Higgs doublet model (MS-2HDM) in which the so-called Standard Model (SM) alignment can be achieved naturally by the virtue of an SO(5) symmetry imposed on the 2HDM. We investigate the signature of the MS-2HDM via pp -> HX -> VV*X and pp -> HHX -> VV*V'V'*X processes at the LHC for different values of tan beta. We perform our calculations with next-to-leading-order (NLO) QCD accuracy, using the HERWIG7 multipurpose event generator at root s = 13 TeV center-of-mass energy. We show that the production of single SM-like Higgs bosons via W-+/-/Z pairs is completely aligned with the SM. Interestingly, the presence of the heavy Higgs states significantly enhances the cross section for the W-+/-/Z-quadruplet production channels in the low-p(perpendicular to) regions. These vital analyses may aid the future discovery of this minimal and very predictive extension of the SM and can be generalized to other realizations of the 2HDM.

Automated summary

In this study, the maximally symmetric two-Higgs doublet model (MS-2HDM) is used to investigate the signature at LHC, showing that the production of Higgs bosons through various processes aligns with the Standard Model. The presence of heavy Higgs states significantly enhances the cross section for specific production channels, indicating potential for future discoveries of this predictive extension.