Exotic seesaw-motivated heavy leptons at the LHC

Kumerički, Krešimir and Picek, Ivica and Radovčić, Branimir (2011) Exotic seesaw-motivated heavy leptons at the LHC. Physical Review D, 84 (9). pp. 93002-14. ISSN 1550-7998

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We study the LHC potential for discovering TeV-scale SU(2)_L 5-plet fermions introduced recently to explain small neutrino masses. We show that the Drell-Yan production and the decays of new exotic Sigma leptons are testable at the LHC. Their production is abundant due to nontrivial electroweak gauge charges. For 1 fb^-1 of integrated luminosity at the present LHC √s =7 TeV, there can be 270 Sigma-Sigmabar pairs produced for M_Sigma = 400 GeV. Besides producing same-sign dilepton events, they could lead, due to a chosen small mixing between heavy and light leptons, to ~10 golden decays Sigma^+++ ( Sigmabar^+++) → W± W± l± with a specific decay signature.

Item Type: Article
Keywords: heavy leptons, tree-level seesaw, neutrino mass, non-standard neutrinos
Date: November 2011
Subjects: NATURAL SCIENCES > Physics > Physics of Elementary Particles and Fields
Additional Information: Copyright (2011) 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: 01 Jun 2014 07:43
Last Modified: 24 Feb 2016 15:00
URI: http://digre.pmf.unizg.hr/id/eprint/2056

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