Impersonating the Standard Model Higgs boson: Alignment without decoupling

Marcela Carena, Ian Low, Nausheen R. Shah, Carlos E.M. Wagner

Research output: Contribution to journalArticlepeer-review

178 Scopus citations


In models with an extended Higgs sector there exists an alignment limit, in which the lightest CP-even Higgs boson mimics the Standard Model Higgs. The alignment limit is commonly associated with the decoupling limit, where all non-standard scalars are significantly heavier than the Z boson. However, alignment can occur irrespective of the mass scale of the rest of the Higgs sector. In this work we discuss the general conditions that lead to "alignment without decoupling", therefore allowing for the existence of additional non-standard Higgs bosons at the weak scale. The values of tan β for which this happens are derived in terms of the effective Higgs quartic couplings in general two-Higgs-doublet models as well as in supersymmetric theories, including the MSSM and the NMSSM. Moreover, we study the information encoded in the variations of the SM Higgs-fermion couplings to explore regions in the m A - tan β parameter space.

Original languageEnglish (US)
Article number15
JournalJournal of High Energy Physics
Issue number4
StatePublished - Apr 2014


  • Supersymmetry Phenomenology

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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