Illuminating Dark Photons with High-Energy Colliders - INSPIRE

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Illuminating Dark Photons with High-Energy Colliders

David Curtin
(
- Maryland U.
)
,
Rouven Essig
(
- YITP, Stony Brook
)
,
Stefania Gori
(
- Perimeter Inst. Theor. Phys.
)
,
Jessie Shelton
(
- Illinois U., Urbana
)

Nov 28, 2014

44 pages

Published in:

JHEP 02 (2015) 157

Published: Feb 24, 2015

e-Print:

1412.0018 [hep-ph]

DOI:

10.1007/JHEP02(2015)157

Report number:

YITP-SB-14-49

View in:

ADS Abstract Service

reference search405 citations

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Abstract: (Springer)

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

2{m}_{\mu }<{m_Z}_{{}_D}<{m}_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. 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.

Note:

36 pages + references, 14 figures, 3 tables. Fixed typos, added references

Higgs Physics
Beyond Standard Model
Gauge Symmetry
photon: hidden sector
photon: model
photon: decay
decay: exotic
hidden symmetry: U(1)
gauge field theory: U(1)
symmetry breaking: U(1)

References(146)

Figures(30)

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