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Proton Fixed-Target Scintillation Experiment to Search for Minicharged Particles
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abstract
We propose a low-cost and movable setup to probe minicharged particles (or milli-charged particles) using high-intensity proton fixed-target facilities. This proposal, FerMINI, consists of a milliQan-type detector, requiring multi-coincident (nominally, triple-coincident) scintillation signatures within a small time window, located downstream of the proton target of a neutrino experiment. During the collisions of a large number of protons on the target, intense minicharged particle beams may be produced via meson photo-decays and Drell-Yan production. We take advantage of the high statistics, shielding, and potential neutrino-detector-related background reduction to search for minicharged particles in two potential sites: the MINOS near detector hall and the proposed DUNE near detector hall, both at Fermilab. We also explore several alternative designs, including the modifications of the nominal detector to increase signal yield, and combining this detector technology with existing and planned neutrino detectors to better search for minicharged particles. The CERN SPS beam and associated experimental structure also provide a similar alternative. FerMINI can achieve unprecedented sensitivity for minicharged particles in the MeV to few GeV regime with fractional charge $\varepsilon=Q_{\chi}/e $ between $10^{-4}$ (potentially saturating the detector limitation) and $10^{-1}$.
Forward citations
Cited by 7 Pith papers
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A New Source of Millicharged Particles: Secondary Showers in the LHC Forward Absorber
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Data-Driven Predictions for Dark Photon and Millicharged Particle Production
A data-driven framework using normalizing flows predicts the rate and kinematic distributions of dark photon and millicharged particle production directly from measured dilepton events.
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Direct Detection of Millicharged Particles from Supernovae
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Return of the CHAMPs: A clockwork portal to charged dark matter
A clockwork chain of U(1) gauge groups naturally generates a dark-matter electric charge of order 10^{-12}e with O(1) inputs, with the relic abundance set by resonant annihilation through TeV-scale Z' bosons.
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Constraints and Projections for Millicharged Dark Matter in the Sun with Water Cherenkov Neutrino Detectors
Super-Kamiokande constrains millicharged dark matter at 5-28 GeV for fractional abundance 10^{-4.5}; Hyper-Kamiokande reaches down to 5x10^{-6}.
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Letter of Intent: The Forward Physics Facility
Proposes construction of the Forward Physics Facility at the HL-LHC with four complementary detectors to exploit forward neutrinos and new-particle fluxes for neutrino, QCD, astroparticle, and dark-matter measurements.
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The Dark Photon
The paper surveys theoretical motivations, experimental searches, and bounds on the dark photon as a kinetically mixed gauge boson from a dark sector, covering both massive and massless cases along with related milli-...
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