Exotic leptons: Higgs, flavor and collider phenomenology
We study extensions of the standard model by one generation of vector-like leptons with non-standard hypercharges, which allow for a sizable modification of the h → γγ decay rate for new lepton masses in the 300 GeV-1 TeV range. We analyze vacuum stability implications for different hypercharges. Ef...
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| Autori principali: | , , |
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| Natura: | Article (Journal) |
| Lingua: | inglese |
| Pubblicazione: |
15 January 2014
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| In: |
Journal of high energy physics
Year: 2014, Fascicolo: 1, Pages: 60 |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP01(2014)060 |
| Accesso online: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.1007/JHEP01(2014)060 Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP01(2014)060 
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| Note sull'autore: | Wolfgang Altmannshofer, Martin Bauer and Marcela Carena |
| Riassunto: | We study extensions of the standard model by one generation of vector-like leptons with non-standard hypercharges, which allow for a sizable modification of the h → γγ decay rate for new lepton masses in the 300 GeV-1 TeV range. We analyze vacuum stability implications for different hypercharges. Effects in h → Zγ are typically much smaller than in h → γγ, but distinct among the considered hypercharge assignments. Non-standard hypercharges constrain or entirely forbid possible mixing operators with standard model leptons. As a consequence, the leading contributions to the experimentally strongly constrained electric dipole moments of standard model fermions are only generated at the two loop level by the new CP violating sources of the considered setups. We derive the bounds from dipole moments, electro-weak precision observables and lepton flavor violating processes, and discuss their implications. Finally, we examine the production and decay channels of the vector-like leptons at the LHC, and find that signatures with multiple light leptons or taus are already probing interesting regions of parameter space. |
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| Descrizione del documento: | Gesehen am 21.11.2017 |
| Descrizione fisica: | Online Resource |
| ISSN: | 1029-8479 |
| DOI: | 10.1007/JHEP01(2014)060 |