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Title: Hierarchies Without Symmetries from Extra Dimensions

Abstract

It is commonly thought that small couplings in a low-energy theory, such as those needed for the fermion mass hierarchy or proton stability, must originate from symmetries in a high-energy theory. We show that this expectation is violated in theories where the Standard Model fields are confined to a thick wall in extra dimensions, with the fermions ''stuck'' at different points in the wall. Couplings between them are then suppressed due to the exponentially small overlaps of their wave functions. This provides a framework for understanding both the fermion mass hierarchy and proton stability without imposing symmetries, but rather in terms of higher dimensional geography. A model independent prediction of this scenario is non-universal couplings of the Standard Model fermions to the ''Kaluza-Klein'' excitations of the gauge fields. This allows a measurement of the fermion locations in the extra dimensions at the LHC or NLC if the wall thickness is close to the TeV scale.

Authors:
;
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
10026
Report Number(s):
SLAC-PUB-8082
TRN: US0103305
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 22 Mar 1999
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 43 PARTICLE ACCELERATORS; DIMENSIONS; FERMIONS; FORECASTING; PROTONS; STABILITY; STANDARD MODEL; THICKNESS; WAVE FUNCTIONS; COUPLING; MASS; KALUZA-KLEIN THEORY; LINEAR COLLIDERS; WALLS

Citation Formats

Arkani-Hamed, Nima, and Schmaltz, Martin. Hierarchies Without Symmetries from Extra Dimensions. United States: N. p., 1999. Web. doi:10.2172/10026.
Arkani-Hamed, Nima, & Schmaltz, Martin. Hierarchies Without Symmetries from Extra Dimensions. United States. doi:10.2172/10026.
Arkani-Hamed, Nima, and Schmaltz, Martin. Mon . "Hierarchies Without Symmetries from Extra Dimensions". United States. doi:10.2172/10026. https://www.osti.gov/servlets/purl/10026.
@article{osti_10026,
title = {Hierarchies Without Symmetries from Extra Dimensions},
author = {Arkani-Hamed, Nima and Schmaltz, Martin},
abstractNote = {It is commonly thought that small couplings in a low-energy theory, such as those needed for the fermion mass hierarchy or proton stability, must originate from symmetries in a high-energy theory. We show that this expectation is violated in theories where the Standard Model fields are confined to a thick wall in extra dimensions, with the fermions ''stuck'' at different points in the wall. Couplings between them are then suppressed due to the exponentially small overlaps of their wave functions. This provides a framework for understanding both the fermion mass hierarchy and proton stability without imposing symmetries, but rather in terms of higher dimensional geography. A model independent prediction of this scenario is non-universal couplings of the Standard Model fermions to the ''Kaluza-Klein'' excitations of the gauge fields. This allows a measurement of the fermion locations in the extra dimensions at the LHC or NLC if the wall thickness is close to the TeV scale.},
doi = {10.2172/10026},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Mar 22 00:00:00 EST 1999},
month = {Mon Mar 22 00:00:00 EST 1999}
}

Technical Report:

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