TeV-scale seesaw mechanism with quintuplet fermions

Znanstveni rad - Izvorni znanstveni rad

• Autor: Krešimir Kumerički
• Autor: Ivica Picek
• Autor: Branimir Radovčić
• Autorova ustanova: Sveučilište u Zagrebu; Prirodoslovno-matematički fakultet; (Fizički odsjek)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Fizika

Sažetak (engleski)

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.

• Ključne riječi (engleski): neutrino mass; exotic leptons; dark matter
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Izvorni znanstveni rad
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov časopisa: Physical Review D - Particles, Fields, Gravitation and Cosmology
• Brojčani podaci: vol. 86, br. 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
• Datum objave publikacije: 2012
• Projekt: Šifra: 119-0982930-1016; Naziv (hrvatski): Elementarne čestice, teorija polja i kozmologija; Voditelj: Ivica Picek; Pravna nadležnost: Hrvatska; Financijer: MZOS; Linija financiranja: ZP
• URL dokumenta: http://link.aps.org/doi/10.1103/PhysRevD.86.013006
• Vrsta resursa: Tekst
• Prava pristupa: Otvoreni pristup
• Javna napomena: Copyright (2012) by the American Physical Society. Received 4 May 2012; published 6 July 2012.
• Datum i vrijeme pohrane: 2019-11-16 18:16:56