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Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios

Robens, Tania; Stefaniak, Tim; Wittbrodt, Jonas (2020) Two-real-scalar-singlet extension of the SM: LHC phenomenology and benchmark scenarios. European Physical Journal C: Particles and Fields, 80 (2). ISSN 1434-6044

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We investigate the 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. 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.

Item Type: Article
Additional Information: We thank the LHC Higgs Cross Section Working Group WG3 conveners for encouraging this study, as well as Massimiliano Grazzini and Georg Weiglein for useful comments. We also thank Claudia Seitz for helpful discussions regarding experimental questions and Liang Li for helpful explanations regarding the experimental search presented in Ref. [61]. The work of TS and JW is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany's Excellence Strategy -EXC 2121 "Quantum Universe" -390833306. TR was supported by the European Union through the Programme Horizon 2020 via the COST action CA15108-Connecting insights in fundamental physics (FUNDAMENTALCONNECTIONS), and additionally wants to thank the DESY Theory group for repeated hospitality while this work was completed.
Uncontrolled Keywords: proton-proton collisions ; boson pair production ; Higgs-boson
Subjects: NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Divisions: Theoretical Physics Division
Depositing User: Tania Natalie Robens
Date Deposited: 30 Apr 2020 10:01
DOI: 10.1140/epjc/s10052-020-7655-x

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