Illuminating dark photons with high-energy colliders

Curtin, David; Essig, Rouven; Gori, Stefania; Shelton, Jessie

doi:10.1007/JHEP02(2015)157

Title: Illuminating dark photons with high-energy colliders

Journal Article · Tue Feb 24 00:00:00 EST 2015 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/JHEP02(2015)157· OSTI ID:1452791

Curtin, David ^[1]; Essig, Rouven ^[2]; Gori, Stefania ^[3]; Shelton, Jessie ^[4]

Univ. of Maryland, College Park, MD (United States). Maryland Center for Fundamental Physics
Stony Brook Univ., Stony Brook, NY (United States). C.N. Yang Inst. for Theoretical Physics
Perimeter Inst. for Theoretical Physics, Waterloo, ON (Canada)
Univ. of Illinois, Urbana, IL (United States). Dept. of Physics

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 2m_μ_{Z_D}_h/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.

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Research Organization:: Stony Brook Univ., NY (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0008061

OSTI ID:: 1452791

Journal Information:: Journal of High Energy Physics (Online), Vol. 2015, Issue 2; ISSN 1029-8479

Publisher:: Springer BerlinCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 199 works

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