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Title: Light hidden mesons through the Z portal

Abstract

Confining hidden sectors are an attractive possibility for physics beyond the Standard Model (SM). They are especially motivated by neutral naturalness theories, which reconcile the lightness of the Higgs with the strong constraints on colored top partners. We study hidden QCD with one light quark flavor, coupled to the SM via effective operators suppressed by the mass M of new electroweak-charged particles. This effective field theory is inspired by a new tripled top model of supersymmetric neutral naturalness. The hidden sector is accessed primarily via the Z and Higgs portals, which also mediate the decays of the hidden mesons back to SM particles. We find that exotic Z decays at the LHC and future Z factories provide the strongest sensitivity to this scenario, and we outline a wide array of searches. For a larger hidden confinement scale Λ ~ O (10) GeV, the exotic Z decays dominantly produce final states with two hidden mesons. ATLAS and CMS can probe their prompt decays up to M ~ 3 TeV at the high luminosity phase, while a TeraZ factory would extend the reach up to M ~ 20 TeV through a combination of searches for prompt and displaced signals. For smaller Λmore » ~ O (1) GeV, the Z decays to the hidden sector produce jets of hidden mesons, which are long-lived. LHCb will be a powerful probe of these emerging jets. Furthermore, the light hidden vector meson could be detected by proposed dark photon searches.« less

Authors:
 [1];  [2]; ORCiD logo [3];  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Hong Kong Univ. of Science and Technology (Hong Kong)
  3. Technische Univ. Munchen, Garching (Germany)
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1595456
Grant/Contract Number:  
SC0009999
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: 11; 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; Effective Field Theories; Nonperturbative Effects

Citation Formats

Cheng, Hsin-Chia, Li, Lingfeng, Salvioni, Ennio, and Verhaaren, Christopher B. Light hidden mesons through the Z portal. United States: N. p., 2019. Web. doi:10.1007/JHEP11(2019)031.
Cheng, Hsin-Chia, Li, Lingfeng, Salvioni, Ennio, & Verhaaren, Christopher B. Light hidden mesons through the Z portal. United States. doi:10.1007/JHEP11(2019)031.
Cheng, Hsin-Chia, Li, Lingfeng, Salvioni, Ennio, and Verhaaren, Christopher B. Wed . "Light hidden mesons through the Z portal". United States. doi:10.1007/JHEP11(2019)031. https://www.osti.gov/servlets/purl/1595456.
@article{osti_1595456,
title = {Light hidden mesons through the Z portal},
author = {Cheng, Hsin-Chia and Li, Lingfeng and Salvioni, Ennio and Verhaaren, Christopher B.},
abstractNote = {Confining hidden sectors are an attractive possibility for physics beyond the Standard Model (SM). They are especially motivated by neutral naturalness theories, which reconcile the lightness of the Higgs with the strong constraints on colored top partners. We study hidden QCD with one light quark flavor, coupled to the SM via effective operators suppressed by the mass M of new electroweak-charged particles. This effective field theory is inspired by a new tripled top model of supersymmetric neutral naturalness. The hidden sector is accessed primarily via the Z and Higgs portals, which also mediate the decays of the hidden mesons back to SM particles. We find that exotic Z decays at the LHC and future Z factories provide the strongest sensitivity to this scenario, and we outline a wide array of searches. For a larger hidden confinement scale Λ ~ O (10) GeV, the exotic Z decays dominantly produce final states with two hidden mesons. ATLAS and CMS can probe their prompt decays up to M ~ 3 TeV at the high luminosity phase, while a TeraZ factory would extend the reach up to M ~ 20 TeV through a combination of searches for prompt and displaced signals. For smaller Λ ~ O (1) GeV, the Z decays to the hidden sector produce jets of hidden mesons, which are long-lived. LHCb will be a powerful probe of these emerging jets. Furthermore, the light hidden vector meson could be detected by proposed dark photon searches.},
doi = {10.1007/JHEP11(2019)031},
journal = {Journal of High Energy Physics (Online)},
number = 11,
volume = 2019,
place = {United States},
year = {2019},
month = {11}
}

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