Abstract
We investigate the LHC phenomenology of a model where the Standard Model (SM) scalar sector is extended by two real scalar singlets. A {{mathbb {Z}}_2} otimes {{mathbb {Z}}_2} ' discrete symmetry is imposed to reduce the number of scalar potential parameters, which is spontaneously broken by the vacuum expectation values of the singlet fields. As a result, all three neutral scalar fields mix, leading to three neutral CP-even scalar bosons, out of which one is identified with the observed Higgs boson at 125 GeV. We explore all relevant collider signatures of the three scalars in this model. Besides the single production of a scalar boson decaying directly to SM particle final states, we extensively discuss the possibility of resonant multi-scalar production. The latter includes decays of the produced scalar boson to two identical scalars (“symmetric decays”), as well as to two different scalars (“asymmetric decays”). Furthermore, we discuss the possibility of successive decays to the lightest scalar states (“cascade decays”), which lead to experimentally spectacular three- and four-Higgs final states. We provide six benchmark scenarios for detailed experimental studies of these Higgs-to-Higgs decay signatures.
Highlights
We investigate the Large Hadron Collider (LHC) phenomenology of a model where the Standard Model (SM) scalar sector is extended by two real scalar singlets
A Z2 ⊗ Z2 discrete symmetry is imposed to reduce the number of scalar potential parameters, which is spontaneously broken by the vacuum expectation values of the singlet fields
We presented the collider phenomenology of a simple extension of the SM Higgs sector, where two real scalar singlet fields are added to the particle content
Summary
Extensions of the SM by scalar singlets are among the simplest possible model beyond the SM (BSM). C (2020) 80:151 the scalar potential and, if they acquire a non-zero vacuum expectation value (vev), mix with the SM Higgs boson and thereby inherit some of its gauge and Yukawa couplings This is the reason why – as long as no new interactions of the scalar singlet fields with additional particles occur – there is no physical difference between a parametrization in terms of N complex scalar singlet fields or 2N real scalar singlet fields. The model considered in the following, features Higgs decays to unidentical scalar bosons (“asymmetric decays”), Higgs decays involving only non-SM-like Higgs bosons, as well as the possibility of successive Higgs-to-Higgs cascade decays All of these decay signatures have not been experimentally explored in detail yet..
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