Electroweak-charged bound states as LHC probes of hidden forces

Li, Lingfeng; Salvioni, Ennio; Tsai, Yuhsin; Zheng, Rui

doi:10.1103/physrevd.97.015010

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

Journal Article · 19 January 2018 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.97.015010 · OSTI ID:1417529

Li, Lingfeng ^[1]; Salvioni, Ennio ^[2]; Tsai, Yuhsin ^[3]; Zheng, Rui ^[1]

Univ. of California, Davis, CA (United States). Dept. of Physics
Technical Univ. of Munich, Garching (Germany). Dept. of Physics
Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics, Dept. of Physics

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.

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Research Organization:: Univ. of California, Davis, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0009999; SC000999

OSTI ID:: 1417529

Alternate ID(s):: OSTI ID: 1505828

Journal Information:: Physical Review. D., Vol. 97, Issue 1; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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