Exotic Leptons. Higgs, Flavor and Collider Phenomenology

Altmannshofer, Wolfgang; Bauer, Martin; Carena, Marcela

doi:10.1007/JHEP01(2014)060

Title: Exotic Leptons. Higgs, Flavor and Collider Phenomenology

Journal Article · Wed Jan 15 00:00:00 EST 2014 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP01(2014)060· OSTI ID:1226266

Altmannshofer, Wolfgang ^[1]; Bauer, Martin ^[2]; Carena, Marcela ^[3]

Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Univ. of Chicago, IL (United States). Enrico Fermi Inst.
Univ. of Chicago, IL (United States). Kavli Inst. of Cosmological Physics

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 also 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. Furthermore, 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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Research Organization:: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1226266

Report Number(s):: FERMILAB-PUB-13-302-T; EFI-13-18; NSF-KITP-13-143; arXiv eprint number arXiv:1308.1987

Journal Information:: Journal of High Energy Physics (Online), Vol. 2014, Issue 60; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 29 works

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