Experimental and theoretical implications of new sequential leptons

Journal Article · Fri Apr 01 04:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.3643· OSTI ID:5093963

Hou, W; Wong, G ^[1]

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1. Department of Physics, National Taiwan University, Taipei, Taiwan 10764 (Taiwan, Province of China)

If new sequential leptons [ital E][sup [plus minus]] and [ital N][sup 0] exist, the CERN LEP bound implies [ital m][sub [ital E]],[ital m][sub [ital N]][gt][ital M][sub [ital Z]]/2. The heaviness of the neutral lepton breaks away from the pattern of the first three generations. The minimal model is to have 4 left-handed lepton doublets and 4 right-handed charged lepton singlets, but only one right-handed neutral lepton singlet. Since in general the third and fourth generations should mix, and since [vert bar][ital m][sub [ital N]][minus][ital m][sub [ital E]][vert bar] should not be too large, neither [ital E] nor [ital N] would be stable, and both tend to decay via the Cabibbo suppressed [ital E][r arrow][nu][sub [tau]] or [ital N][r arrow][tau] charged currents. This leads to the interesting signature of like-sign [ital W] pair production via [ital E][sup +][ital N][r arrow][bar [nu]][sub [tau]][tau][sup [minus]][ital W+][ital W+] at the SSC and CERN LHC. The popular seesaw mechanism cannot plausibly accommodate the near masslessness of the light neutrinos and the heaviness of [ital N][sup 0] simultaneously. The representation structure poses a difficulty to the traditional approach of SO(10)-based grand unified theories. The discovery of such new heavy leptons would thus have interesting implications.

• OSTI ID: 5093963
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 49:7; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662210* -- Specific Theories & Interaction Models
662370 -- Decays of Leptons-- (1992-)
662430 -- Properties of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
BOSONS
CERN
CHARGED CURRENTS
CURRENTS
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
GRAND UNIFIED THEORY
HEAVY LEPTONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
INTERNATIONAL ORGANIZATIONS
LEPTONS
LIE GROUPS
MASS
MATHEMATICAL MODELS
PAIR PRODUCTION
PARTICLE MODELS
PARTICLE PRODUCTION
POSTULATED PARTICLES
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
SO GROUPS
SO-10 GROUPS
SYMMETRY GROUPS
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
W PLUS BOSONS