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Title: Relaxation of the composite Higgs little hierarchy

Abstract

We describe a composite Higgs scenario in which a cosmological relaxation mechanism naturally gives rise to a hierarchy between the weak scale and the scale of spontaneous global symmetry breaking. This is achieved through the scanning of sources of explicit global symmetry breaking by a relaxion field during an exponentially long period of inflation in the early universe. We explore this mechanism in detail in a specific composite Higgs scenario with QCD-like dynamics, based on an ultraviolet SU(N )TC ‘technicolor’ confining gauge theory with three Dirac technifermion flavors. We find that we can successfully generate a hierarchy of scales ξ≡ 2/F π 2 ≳1.2×10 –4 (i.e., compositeness scales F π ~ 20 TeV) without tuning. This evades all current electroweak precision bounds on our (custodial violating) model. While directly observing the heavy composite states in this model will be challenging, a future electroweak precision measurement program can probe most of the natural parameter space for the model. We also highlight signatures of more general composite Higgs models in the cosmological relaxation framework, including some implications for flavor and dark matter.

Authors:
 [1]; ORCiD logo [2];  [2]
  1. Univ. of Pittsburgh, Pittsburgh, PA (United States)
  2. The Univ. of Chicago, Chicago, IL (United States)
Publication Date:
Research Org.:
Univ. of Chicago, IL (United States); Univ. of Pittsburgh, Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1512497
Grant/Contract Number:  
SC0013642; SC0015634
Resource Type:
Accepted Manuscript
Journal Name:
Journal of High Energy Physics (Online)
Additional Journal Information:
Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2017; Journal Issue: 12; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTRONOMY AND ASTROPHYSICS; Technicolor and Composite Models; Higgs; Physics Beyond Standard Model

Citation Formats

Batell, Brian, Fedderke, Michael A., and Wang, Lian -Tao. Relaxation of the composite Higgs little hierarchy. United States: N. p., 2017. Web. doi:10.1007/jhep12(2017)139.
Batell, Brian, Fedderke, Michael A., & Wang, Lian -Tao. Relaxation of the composite Higgs little hierarchy. United States. doi:10.1007/jhep12(2017)139.
Batell, Brian, Fedderke, Michael A., and Wang, Lian -Tao. Thu . "Relaxation of the composite Higgs little hierarchy". United States. doi:10.1007/jhep12(2017)139. https://www.osti.gov/servlets/purl/1512497.
@article{osti_1512497,
title = {Relaxation of the composite Higgs little hierarchy},
author = {Batell, Brian and Fedderke, Michael A. and Wang, Lian -Tao},
abstractNote = {We describe a composite Higgs scenario in which a cosmological relaxation mechanism naturally gives rise to a hierarchy between the weak scale and the scale of spontaneous global symmetry breaking. This is achieved through the scanning of sources of explicit global symmetry breaking by a relaxion field during an exponentially long period of inflation in the early universe. We explore this mechanism in detail in a specific composite Higgs scenario with QCD-like dynamics, based on an ultraviolet SU(N )TC ‘technicolor’ confining gauge theory with three Dirac technifermion flavors. We find that we can successfully generate a hierarchy of scales ξ≡ 2/F π 2 ≳1.2×10–4 (i.e., compositeness scales F π ~ 20 TeV) without tuning. This evades all current electroweak precision bounds on our (custodial violating) model. While directly observing the heavy composite states in this model will be challenging, a future electroweak precision measurement program can probe most of the natural parameter space for the model. We also highlight signatures of more general composite Higgs models in the cosmological relaxation framework, including some implications for flavor and dark matter.},
doi = {10.1007/jhep12(2017)139},
journal = {Journal of High Energy Physics (Online)},
number = 12,
volume = 2017,
place = {United States},
year = {2017},
month = {12}
}

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