TeV-scale seesaw mechanism with quintuplet fermions

Scientific paper - Original scientific paper

• Author: Krešimir Kumerički
• Author: Ivica Picek
• Author: Branimir Radovčić
• Author's institution: University of Zagreb; Faculty of Science; (Department of Physics)
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Physics

Abstract (english)

We propose a new seesaw model based on a fermionic hypercharge-zero weak quintuplet in conjunction with an additional scalar quadruplet which attains an induced vacuum expectation value. The model provides both tree-level seesaw ~v6/M5 and loop-suppressed radiative ~(1/16π2) · v2/M contributions to active neutrino masses. The empirical masses m 101 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 Σ++ or Σ++overbar fermions with mass MΣ = 400 GeV, leading to interesting multilepton signatures. The neutral component of the fermion quintuplet, previously identified as a minimal dark matter candidate, becomes unstable in the proposed seesaw setup. The stability can be restored by introducing a Z2 symmetry, in which case neutrinos get mass only from radiative contributions.

• Keywords (english): neutrino mass; exotic leptons; dark matter
• Language: english
• Publication type: Scientific paper - Original scientific paper
• Publication status: Published
• Peer review: Peer review - international
• Publication version: Published version
• Journal title: Physical Review D - Particles, Fields, Gravitation and Cosmology
• Numbering: vol. 86, no. 1, 013006
• p-ISSN: 1550-7998
• e-ISSN: 1550-2368
• DOI: https://doi.org/10.1103/PhysRevD.86.013006
• URN:NBN: urn:nbn:hr:217:141911
• Publication: 2012
• Project: Number: 119-0982930-1016; Title (croatian): Elementarne čestice, teorija polja i kozmologija; Leader: Ivica Picek; Jurisdiction: Croatia; Funding stream: ZP
• Document URL: http://link.aps.org/doi/10.1103/PhysRevD.86.013006
• Type of resource: Text
• Access conditions: Open access
• Public note: Copyright (2012) by the American Physical Society. Received 4 May 2012; published 6 July 2012.
• Created on: 2019-11-16 18:16:56