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Title: Illuminating dark photons with high-energy colliders

Abstract

High-energy colliders offer a unique sensitivity to dark photons, the mediators of a broken dark U(1) gauge theory that kinetically mixes with the Standard Model (SM) hypercharge. Dark photons can be detected in the exotic decay of the 125 GeV Higgs boson, h→ZZ D →4ℓ, and in Drell-Yan events, pp→Z D → ℓℓ. If the dark U(1) is broken by a hidden-sector Higgs mechanism, then mixing between the dark and SM Higgs bosons also allows the exotic decay h → Z D Z D → 4ℓ. We show that the 14 TeV LHC and a 100 TeV proton-proton collider provide powerful probes of both exotic Higgs decay channels. In the case of kinetic mixing alone, direct Drell-Yan production offers the best sensitivity to Z D, and can probe ϵ ≳ 9 × 10–4 (4 × 10–4) at the HL-LHC (100 TeV pp collider). The exotic Higgs decay h → ZZ D offers slightly weaker sensitivity, but both measurements are necessary to distinguish the kinetically mixed dark photon from other scenarios. If Higgs mixing is also present, then the decay h → Z D Z D can allow sensitivity to the Z D for ϵ ≳ 10–9 – 10–6 (10–10more » 10–7) for the mass range 2mμZDh/2 by searching for displaced dark photon decays. We also compare the Z D sensitivity at pp colliders to the indirect, but model-independent, sensitivity of global fits to electroweak precision observables. Here, we perform a global electroweak fit of the dark photon model, substantially updating previous work in the literature. Electroweak precision measurements at LEP, Tevatron, and the LHC exclude ϵ as low as 3 × 10–2. Sensitivity can be improved by up to a factor of ~ 2 with HL-LHC data, and an additional factor of ~ 4 with ILC/GigaZ data.« less

Authors:
 [1];  [2];  [3];  [4]
  1. Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics
  2. Stony Brook Univ., Stony Brook, NY (United States). C.N. Yang Inst. for Theoretical Physics
  3. Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
  4. Univ. of Illinois, Urbana, IL (United States). Dept. of Physics
Publication Date:
Research Org.:
Stony Brook Univ., NY (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1452791
Grant/Contract Number:  
SC0008061
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: 2015; Journal Issue: 2; Journal ID: ISSN 1029-8479
Publisher:
Springer Berlin
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Higgs Physics; Beyond Standard Model; Gauge Symmetry

Citation Formats

Curtin, David, Essig, Rouven, Gori, Stefania, and Shelton, Jessie. Illuminating dark photons with high-energy colliders. United States: N. p., 2015. Web. doi:10.1007/JHEP02(2015)157.
Curtin, David, Essig, Rouven, Gori, Stefania, & Shelton, Jessie. Illuminating dark photons with high-energy colliders. United States. https://doi.org/10.1007/JHEP02(2015)157
Curtin, David, Essig, Rouven, Gori, Stefania, and Shelton, Jessie. Tue . "Illuminating dark photons with high-energy colliders". United States. https://doi.org/10.1007/JHEP02(2015)157. https://www.osti.gov/servlets/purl/1452791.
@article{osti_1452791,
title = {Illuminating dark photons with high-energy colliders},
author = {Curtin, David and Essig, Rouven and Gori, Stefania and Shelton, Jessie},
abstractNote = {High-energy colliders offer a unique sensitivity to dark photons, the mediators of a broken dark U(1) gauge theory that kinetically mixes with the Standard Model (SM) hypercharge. Dark photons can be detected in the exotic decay of the 125 GeV Higgs boson, h→ZZ D →4ℓ, and in Drell-Yan events, pp→Z D → ℓℓ. If the dark U(1) is broken by a hidden-sector Higgs mechanism, then mixing between the dark and SM Higgs bosons also allows the exotic decay h → Z D Z D → 4ℓ. We show that the 14 TeV LHC and a 100 TeV proton-proton collider provide powerful probes of both exotic Higgs decay channels. In the case of kinetic mixing alone, direct Drell-Yan production offers the best sensitivity to Z D, and can probe ϵ ≳ 9 × 10–4 (4 × 10–4) at the HL-LHC (100 TeV pp collider). The exotic Higgs decay h → ZZ D offers slightly weaker sensitivity, but both measurements are necessary to distinguish the kinetically mixed dark photon from other scenarios. If Higgs mixing is also present, then the decay h → Z D Z D can allow sensitivity to the Z D for ϵ ≳ 10–9 – 10–6 (10–10 – 10–7) for the mass range 2mμZDh/2 by searching for displaced dark photon decays. We also compare the Z D sensitivity at pp colliders to the indirect, but model-independent, sensitivity of global fits to electroweak precision observables. Here, we perform a global electroweak fit of the dark photon model, substantially updating previous work in the literature. Electroweak precision measurements at LEP, Tevatron, and the LHC exclude ϵ as low as 3 × 10–2. Sensitivity can be improved by up to a factor of ~ 2 with HL-LHC data, and an additional factor of ~ 4 with ILC/GigaZ data.},
doi = {10.1007/JHEP02(2015)157},
journal = {Journal of High Energy Physics (Online)},
number = 2,
volume = 2015,
place = {United States},
year = {Tue Feb 24 00:00:00 EST 2015},
month = {Tue Feb 24 00:00:00 EST 2015}
}

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