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Title: Electroweak-charged bound states as LHC probes of hidden forces

Abstract

We explore the LHC reach on beyond-the-standard model (BSM) particles X associated with a new strong force in a hidden sector. We focus on the motivated scenario where the SM and hidden sectors are connected by fermionic mediators ψþ;0 that carry SM electroweak charges. The most promising signal is the Drell-Yan production of a ψ ±ψ-0 pair, which forms an electrically charged vector bound state Υ ± due to the hidden force and later undergoes resonant annihilation into W±X. We analyze this final state in detail in the cases where X is a real scalar Φ that decays to $$b\bar{b}$$, or a dark photon γ d that decays to dileptons. For prompt X decays, we show that the corresponding signatures can be efficiently probed by extending the existing ATLAS and CMS diboson searches to include heavy resonance decays into BSM particles. For long-lived X, we propose new searches where the requirement of a prompt hard lepton originating from the W boson ensures triggering and essentially removes any SM backgrounds. To illustrate the potential of our results, we interpret them within two explicit models that contain strong hidden forces and electroweakcharged mediators, namely λ-supersymmetry (SUSY) and non-SUSY ultraviolet extensions of the twin Higgs model. The resonant nature of the signals allows for the reconstruction of the mass of both Υ ± and X, thus providing a wealth of information about the hidden sector.

Authors:
; ; ;
Publication Date:
Research Org.:
Univ. of California, Davis, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1417529
Alternate Identifier(s):
OSTI ID: 1505828
Grant/Contract Number:  
SC000999; SC0009999
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 97 Journal Issue: 1; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Li, Lingfeng, Salvioni, Ennio, Tsai, Yuhsin, and Zheng, Rui. Electroweak-charged bound states as LHC probes of hidden forces. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.015010.
Li, Lingfeng, Salvioni, Ennio, Tsai, Yuhsin, & Zheng, Rui. Electroweak-charged bound states as LHC probes of hidden forces. United States. doi:10.1103/PhysRevD.97.015010.
Li, Lingfeng, Salvioni, Ennio, Tsai, Yuhsin, and Zheng, Rui. Fri . "Electroweak-charged bound states as LHC probes of hidden forces". United States. doi:10.1103/PhysRevD.97.015010.
@article{osti_1417529,
title = {Electroweak-charged bound states as LHC probes of hidden forces},
author = {Li, Lingfeng and Salvioni, Ennio and Tsai, Yuhsin and Zheng, Rui},
abstractNote = {We explore the LHC reach on beyond-the-standard model (BSM) particles X associated with a new strong force in a hidden sector. We focus on the motivated scenario where the SM and hidden sectors are connected by fermionic mediators ψþ;0 that carry SM electroweak charges. The most promising signal is the Drell-Yan production of a ψ±ψ-0 pair, which forms an electrically charged vector bound state Υ± due to the hidden force and later undergoes resonant annihilation into W±X. We analyze this final state in detail in the cases where X is a real scalar Φ that decays to $b\bar{b}$, or a dark photon γd that decays to dileptons. For prompt X decays, we show that the corresponding signatures can be efficiently probed by extending the existing ATLAS and CMS diboson searches to include heavy resonance decays into BSM particles. For long-lived X, we propose new searches where the requirement of a prompt hard lepton originating from the W boson ensures triggering and essentially removes any SM backgrounds. To illustrate the potential of our results, we interpret them within two explicit models that contain strong hidden forces and electroweakcharged mediators, namely λ-supersymmetry (SUSY) and non-SUSY ultraviolet extensions of the twin Higgs model. The resonant nature of the signals allows for the reconstruction of the mass of both Υ± and X, thus providing a wealth of information about the hidden sector.},
doi = {10.1103/PhysRevD.97.015010},
journal = {Physical Review D},
number = 1,
volume = 97,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1103/PhysRevD.97.015010

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Cited by: 3 works
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Figures / Tables:

FIG. 1 FIG. 1: The collider processes studied in this paper. Here ψ+,0 are the mediators, new particles that carry SM electroweak (but not color) charge, which we take to be vectorlike fermions. Their Drell-Yan pair production leads to the formation of electroweak-charged bound states due to a hidden force. The annihilationmore » of the electrically charged bound state ϒ± produces a W±X pair, where X is the hidden force carrier. We take X to be either a real scalar ϕ, which decays back to the SM via mass mixing with the SM-like Higgs boson, or a dark photon γd that decays via kinetic mixing with the SM photon. The ϕ → $ b\bar{b} $ and γd → ℓℓ decays are selected, which can be either prompt or displaced on collider time scales.« less

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