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Title: Light scalars and dark photons in Borexino and LSND experiments

Journal Article · · Physics Letters. B
 [1]; ORCiD logo [2]
  1. Univ. of Victoria, Victoria, BC (Canada); Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)
  2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Bringing an external radioactive source close to a large underground detector can significantly advance sensitivity not only to sterile neutrinos but also to “dark” gauge bosons and scalars. Here we address in detail the sensitivity reach of the Borexino-SOX configuration, which will see a powerful (a few PBq) 144Ce–144Pr source installed next to the Borexino detector, to light scalar particles coupled to the SM fermions. The mass reach of this configuration is limited by the energy release in the radioactive γ -cascade, which in this particular case is 2.2 MeV. Within that reach one year of operations will achieve an unprecedented sensitivity to coupling constants of such scalars, reaching down to g ~ 10–7 levels and probing significant parts of parameter space not excluded by either beam dump constraints or astrophysical bounds. Should the current proton charge radius discrepancy be caused by the exchange of a MeV-mass scalar, then the simplest models will be decisively probed in this setup. In conclusion, we also update the beam dump constraints on light scalars and vectors, and in particular rule out dark photons with masses below 1 MeV, and couplings ϵ ≥ 10–5.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1490854
Report Number(s):
arXiv:1706.00424; FERMILAB-PUB-17-689-A; 1602481
Journal Information:
Physics Letters. B, Vol. 785, Issue C; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (10)

Constraints on flavor-diagonal non-standard neutrino interactions from Borexino Phase-II text January 2020
Millicharged particles in neutrino experiments text January 2018
Severe Constraints on New Physics Explanations of the MiniBooNE Excess text January 2018
Sterile neutrino oscillometry with Jinping journal July 2020
Constraints on flavor-diagonal non-standard neutrino interactions from Borexino Phase-II text January 2020
Proton Fixed-Target Scintillation Experiment to Search for Minicharged Particles text January 2018
Testing New Physics Explanations of MiniBooNE Anomaly at Neutrino Scattering Experiments text January 2018
The High-Energy Frontier of the Intensity Frontier: Closing the Dark Photon, Inelastic Dark Matter, and Muon g-2 Windows text January 2019
Resonant Self-Interacting Dark Matter from Dark QCD text January 2020
FORMOSA: Looking Forward to Millicharged Dark Sectors text January 2020

Figures / Tables (2)


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