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Title: Left-right symmetric heterotic-string derived models

Abstract

Recently it was demonstrated that free fermionic heterotic strings can produce models with solely the minimal supersymmetric standard model states in the low energy spectrum. This unprecedented result provides further strong evidence for the possibility that the true string vacuum shares some of the properties of the free fermionic models. Past free fermionic models have focused on several possible unbroken observable SO(10) subgroups at the string scale, which include the flipped SU(5) (FSU5), the Pati-Salam (PS) string models, and the string standard-like models (SLM). We extend this study to include the case in which the SO(10) symmetry is broken to the left-right symmetric (LRS) gauge group, SO(10){yields}SU(3){sub C}xU(1){sub B-L}xSU(2){sub L}xSU(2){sub R}. We present several models of this type and discuss their phenomenological features. The most striking new outcome of the LRS string models, in contrast with the case of the FSU5, the PS, and the SLM string models, is that they can produce effective field theories that are free of Abelian anomalies. We discuss the distinction between the two types of free fermionic models which result in the presence, or absence, of an anomalous U(1). As a counterexample we also present a LRS model that does contain an anomalous U(1).more » Additionally, we discuss how in string models the standard model spectrum may arise from the three 16 representations of SO(10), while the weak hypercharge does not have the canonical SO(10) embedding.« less

Authors:
; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40205077
Resource Type:
Journal Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 63; Journal Issue: 6; Other Information: DOI: 10.1103/PhysRevD.63.066001; Othernumber: PRVDAQ000063000006066001000001; 044024PRD; PBD: 15 Mar 2001; Journal ID: ISSN 0556-2821
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; FIELD THEORIES; HYPERCHARGE; STANDARD MODEL; STRING MODELS; SYMMETRY

Citation Formats

Cleaver, Gerald B, Faraggi, Alon E, and Savage, Christopher. Left-right symmetric heterotic-string derived models. United States: N. p., 2001. Web. doi:10.1103/PhysRevD.63.066001.
Cleaver, Gerald B, Faraggi, Alon E, & Savage, Christopher. Left-right symmetric heterotic-string derived models. United States. https://doi.org/10.1103/PhysRevD.63.066001
Cleaver, Gerald B, Faraggi, Alon E, and Savage, Christopher. Thu . "Left-right symmetric heterotic-string derived models". United States. https://doi.org/10.1103/PhysRevD.63.066001.
@article{osti_40205077,
title = {Left-right symmetric heterotic-string derived models},
author = {Cleaver, Gerald B and Faraggi, Alon E and Savage, Christopher},
abstractNote = {Recently it was demonstrated that free fermionic heterotic strings can produce models with solely the minimal supersymmetric standard model states in the low energy spectrum. This unprecedented result provides further strong evidence for the possibility that the true string vacuum shares some of the properties of the free fermionic models. Past free fermionic models have focused on several possible unbroken observable SO(10) subgroups at the string scale, which include the flipped SU(5) (FSU5), the Pati-Salam (PS) string models, and the string standard-like models (SLM). We extend this study to include the case in which the SO(10) symmetry is broken to the left-right symmetric (LRS) gauge group, SO(10){yields}SU(3){sub C}xU(1){sub B-L}xSU(2){sub L}xSU(2){sub R}. We present several models of this type and discuss their phenomenological features. The most striking new outcome of the LRS string models, in contrast with the case of the FSU5, the PS, and the SLM string models, is that they can produce effective field theories that are free of Abelian anomalies. We discuss the distinction between the two types of free fermionic models which result in the presence, or absence, of an anomalous U(1). As a counterexample we also present a LRS model that does contain an anomalous U(1). Additionally, we discuss how in string models the standard model spectrum may arise from the three 16 representations of SO(10), while the weak hypercharge does not have the canonical SO(10) embedding.},
doi = {10.1103/PhysRevD.63.066001},
url = {https://www.osti.gov/biblio/40205077}, journal = {Physical Review D},
issn = {0556-2821},
number = 6,
volume = 63,
place = {United States},
year = {2001},
month = {3}
}