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Title: Effective theories of dark mesons with custodial symmetry

Abstract

Dark mesons are bosonic composites of a new, strongly-coupled sector beyond the Standard Model. We consider several dark sectors with fermions that transform under the electroweak group, as arise from a variety of models including strongly-coupled theories of dark matter (e.g., stealth dark matter), bosonic technicolor (strongly-coupled indcued electroweak symmetry breaking), vector-like confinement, etc. We consider theories with two and four flavors under an SU(N) strong group that acquire variously chiral, vector-like, and mixed contributions to their masses. We construct the non-linear sigma model describing the dark pions and match the ultraviolet theory onto a low energy effective theory that provides the leading interactions of the lightest dark pions with the Standard Model. We uncover two distinct classes of effective theories that are distinguishable by how the lightest dark pions decay: “Gaugephilic”: where π0 → Zh, π± → W h dominate once kinematically open, and “Gaugephobic”: where π0→$$\bar{f}f$$, π±→$$\bar{f'}f$$ dominate. Custodial SU(2) plays a critical role in determining the “philic” or “phobic” nature of a model. In dark sectors that preserve custodial SU(2), there is no axial anomaly, and so the decay π0 → γγ is highly suppressed. In a companion paper, we study dark pion production and decay at colliders, obtaining the constraints and sensitsivity at the LHC.

Authors:
 [1];  [2];  [1]
  1. Univ. of Oregon, Eugene, OR (United States)
  2. Univ. of Notre Dame, IN (United States)
Publication Date:
Research Org.:
Univ. of Oregon, Eugene, OR (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF)
OSTI Identifier:
1601472
Grant/Contract Number:  
SC0011640; PHY-1520966; PHY-1820860
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: 2019; Journal Issue: 8; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Beyond Standard Model; Technicolor and Composite Models

Citation Formats

Kribs, Graham D., Martin, Adam, and Tong, Tom. Effective theories of dark mesons with custodial symmetry. United States: N. p., 2019. Web. https://doi.org/10.1007/JHEP08(2019)020.
Kribs, Graham D., Martin, Adam, & Tong, Tom. Effective theories of dark mesons with custodial symmetry. United States. https://doi.org/10.1007/JHEP08(2019)020
Kribs, Graham D., Martin, Adam, and Tong, Tom. Mon . "Effective theories of dark mesons with custodial symmetry". United States. https://doi.org/10.1007/JHEP08(2019)020. https://www.osti.gov/servlets/purl/1601472.
@article{osti_1601472,
title = {Effective theories of dark mesons with custodial symmetry},
author = {Kribs, Graham D. and Martin, Adam and Tong, Tom},
abstractNote = {Dark mesons are bosonic composites of a new, strongly-coupled sector beyond the Standard Model. We consider several dark sectors with fermions that transform under the electroweak group, as arise from a variety of models including strongly-coupled theories of dark matter (e.g., stealth dark matter), bosonic technicolor (strongly-coupled indcued electroweak symmetry breaking), vector-like confinement, etc. We consider theories with two and four flavors under an SU(N) strong group that acquire variously chiral, vector-like, and mixed contributions to their masses. We construct the non-linear sigma model describing the dark pions and match the ultraviolet theory onto a low energy effective theory that provides the leading interactions of the lightest dark pions with the Standard Model. We uncover two distinct classes of effective theories that are distinguishable by how the lightest dark pions decay: “Gaugephilic”: where π0 → Zh, π± → W h dominate once kinematically open, and “Gaugephobic”: where π0→$\bar{f}f$, π±→$\bar{f'}f$ dominate. Custodial SU(2) plays a critical role in determining the “philic” or “phobic” nature of a model. In dark sectors that preserve custodial SU(2), there is no axial anomaly, and so the decay π0 → γγ is highly suppressed. In a companion paper, we study dark pion production and decay at colliders, obtaining the constraints and sensitsivity at the LHC.},
doi = {10.1007/JHEP08(2019)020},
journal = {Journal of High Energy Physics (Online)},
number = 8,
volume = 2019,
place = {United States},
year = {2019},
month = {8}
}

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