Identifying unconventional E[sub 6] models at [ital e][sup +][ital e][sup [minus]] colliders

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

DOI:https://doi.org/10.1103/PhysRevD.50.203· OSTI ID:7233443

Nardi, E ^[1]; Rizzo, T G ^[2]

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1. Randall Laboratory of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120 (United States)
2. Stanford Linear Accelerator Laboratory, Stanford University, Stanford, California 94309 (United States)

Recently it was shown that, in the framework of superstring-inspired E[sub 6] models, the presence of generation-dependent discrete symmetries allows us to construct a phenomenologically viable class of models in which the three generations of fermions do not have the same embedding within the fundamental 27-dimensional representation of E[sub 6]. In this scenario these different embeddings of the conventional fermions imply that the left-handed charged leptons and the right-handed [ital d]-type quarks are coupled in a nonuniversal way to the new neutral gauge bosons ([ital Z][sub [theta]]) present in these models. It was also shown that a unique signature for this scenario would be a deviation from unity for the ratio of cross sections for the production of two different lepton species in [ital e][sup +][ital e][sup [minus]] annihilation. However, several different scenarios are possible, depending on the particular assignment chosen for [ital e][sub [ital L]], [mu][sub [ital L]], and [tau][sub [ital L]] and for the right-handed [ital d]-type quarks, as well as on the type of [ital Z][sub [theta]] boson. Such scenarios cannot be disentangled from one another by means of cross section measurements alone. In this paper we examine the possibility of identifying the pattern of embeddings through measurements of polarized and unpolarized asymmetries for fermion pair production at the 500 GeV [ital e][sup +][ital e][sup [minus]] Next Linear Collider. We show that it will be possible to identify the different patterns of unconventional assignments for the left-handed leptons and for the [ital b][sub [ital R]] quark, for [ital Z][sub [theta]] masses as large as [similar to]1.5 TeV.

• DOE Contract Number: AC03-76SF00515; AC02-76ER01112
• OSTI ID: 7233443
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
ASYMMETRY
BASIC INTERACTIONS
BOSONS
COMPOSITE MODELS
CROSS SECTIONS
ELECTROMAGNETIC INTERACTIONS
ELECTRON-POSITRON INTERACTIONS
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON-LEPTON INTERACTIONS
LEPTONS
MATHEMATICAL MODELS
PAIR PRODUCTION
PARTICLE INTERACTIONS
PARTICLE MODELS
PARTICLE PRODUCTION
POSTULATED PARTICLES
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
QUARK MODEL
QUARKS
STRING MODELS
SUPERSTRING MODELS
Z NEUTRAL BOSONS