TeV-scale seesaw mechanism with quintuplet fermions

Kumerički, Krešimir and Picek, Ivica and Radovčić, Branimir (2012) TeV-scale seesaw mechanism with quintuplet fermions. Physical Review D, 86 (1). pp. 13006-9. ISSN 1550-7998

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Abstract

We propose a new seesaw model based on fermionic hypercharge zero weak quintuplet in conjunction with additional scalar quadruplet which attains an induced vev. The model provides both tree-level seesaw ~ v^6/M^5 and a loop-suppressed radiative ~ (1 / 16 \pi^2) v^2/M contributions to active neutrino masses. The empirical masses m_\nu ~ 10^{; ; -1}; ; eV can be achieved with M ~ TeV new states, accessible at the LHC. For 5 fb^{; ; -1}; ; of accumulated integrated luminosity at the LHC, there could be ~ 500 doubly-charged \Sigma^{; ; ++}; ; or \bar{; ; \Sigma^{; ; ++}; ; }; ; fermions with mass M_\Sigma = 400 GeV, leading to interesting multi-lepton signatures. The neutral component of the fermion quintuplet, previously identified as minimal dark matter candidate, becomes unstable in the proposed seesaw setup. The stability can be restored by introducing a Z_2 symmetry, in which case neutrinos get mass only from radiative contributions.

Item Type: Article
Keywords: neutrino mass ; exotic leptons ; dark matter
Date: July 2012
Subjects: NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Additional Information: Copyright (2012) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982930-1016
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 10 Jul 2014 11:41
Last Modified: 23 Feb 2016 15:58
URI: http://digre.pmf.unizg.hr/id/eprint/2154

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