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High scale impact in alignment and decoupling in two-Higgs-doublet models

Basler, Philipp; Ferreira, Pedro M.; Mühlleitner, Margarete; Santos, Rui

The two-Higgs-doublet model (2HDM) provides an excellent benchmark to study physics beyond the Standard Model (SM). In this work, we discuss how the behavior of the model at high-energy scales causes it to have a scalar with properties very similar to those of the SM—which means the 2HDM can be seen to naturally favor a decoupling or alignment limit. For a type II 2HDM, we show that requiring the model to be theoretically valid up to a scale of 1 TeV, by studying the renormalization group equations (RGE) of the parameters of the model, causes a significant reduction in the allowed magnitude of the quartic couplings. This, combined with B-physics bounds, forces the model to be naturally decoupled. As a consequence, any nondecoupling limits in type II, like the wrong-sign scenario, are excluded. On the contrary, even with the very constraining limits for the Higgs couplings from the LHC, the type I model can deviate substantially from alignment. An RGE analysis similar to that made for type II shows, however, that requiring a single scalar to be heavier than about 500 GeV would be sufficient for the model to be decoupled. Finally, we ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000083359
Veröffentlicht am 15.06.2018
DOI: 10.1103/PhysRevD.97.095024
Zitationen: 8
Web of Science
Zitationen: 8
Zugehörige Institution(en) am KIT Institut für Theoretische Physik (ITP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2470-0010, 2470-0029
KITopen-ID: 1000083359
Erschienen in Physical review / D
Band 97
Heft 9
Seiten Article: 095024
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 18.05.2018
Nachgewiesen in Scopus
Web of Science
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