Search for the Dark Photon and the Dark Higgs Boson at Belle
The dark photon and the dark Higgs boson are hypothetical constituents featured in a number of recently proposed dark sector models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgstrahlung channel , with . We investigate ten exclusive final states with , , or in the mass ranges and . We also investigate three inclusive final states , , and , where denotes a dark photon candidate detected via missing mass, in the mass ranges and . Using the entire data set collected by Belle, we determine no significant signal. Here, we obtain individual and combined 90% credibility level upper limits on the branching fraction times the Born cross section, , on the Born cross section , and on the dark photon coupling to the dark Higgs boson times the kinetic mixing between the standard model photon and the dark photon, . These limits improve upon and cover wider mass ranges than previous experiments. The limits from the final states and are the first placed by any experiment. For equal to , , and , we exclude values of the mixing parameter above ~ 8×10-4.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Univ. of Hawaii, Honolulu, HI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); USDOE
- Contributing Organization:
- Belle Collaboration
- Grant/Contract Number:
- SC0009973
- OSTI ID:
- 1594432
- Alternate ID(s):
- OSTI ID: 1224597
- Journal Information:
- Physical Review Letters, Vol. 114, Issue 21; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Long-lived particles at the energy frontier: the MATHUSLA physics case
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journal | October 2019 |
Dark-photon searches via Z H production at e + e − colliders
|
journal | September 2017 |
Lepton-Flavor Violating Mediators | text | January 2016 |
Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case | text | January 2018 |
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