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Search for Millicharged Particles at SLAC
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Particles with electric charge q < 10^(-3)e and masses in the range 1--100 MeV/c^2 are not excluded by present experiments. An experiment uniquely suited to the production and detection of such "millicharged" particles has been carried out at SLAC. This experiment is sensitive to the infrequent excitation and ionization of matter expected from the passage of such a particle. Analysis of the data rules out a region of mass and charge, establishing, for example, a 95%-confidence upper limit on electric charge of 4.1X10^(-5)e for millicharged particles of mass 1 MeV/c^2 and 5.8X10^(-4)e for mass 100 MeV/c^2.
Forward citations
Cited by 19 Pith papers
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The Black Hole Mass Gap as a New Probe of Millicharged Particles
Millicharged particles weaken pulsational pair-instability in massive stars, shifting the lower edge of the black hole mass gap upward and turning gravitational wave observations into a probe for particles with masses...
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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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New Limits on Charged Dark Matter from Large-Scale Coherent Magnetic Fields
The intact interstellar gas disk of the Milky Way implies charged dark matter must have charge-to-mass ratio below about 10^-13 e/GeV, unless it makes up only a small fraction of dark matter.
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High resolution Lyman-{\alpha} forest constraints on dark matter-neutrino scattering
The Lyman-alpha forest constrains dark matter-neutrino scattering to u_nu_chi < 1.5e-8 (95% C.L.), excluding previously claimed hints of a non-zero interaction.
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Direct Detection of Millicharged Particles from Supernovae
Calculations show millicharged particles from supernovae can produce over 10 electron-recoil events per year in major detectors for millicharge 10^{-9} and sub-MeV to MeV masses, improving SN cooling bounds by up to a...
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Renormalisation and invariants for two U(1)s
A covariant non-canonical kinetic term formulation for two U(1) models yields simple two-loop MSbar RGEs and reparametrization-invariant quantities linked to millicharges.
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Freeze-in Production of Non-Abelian Millicharged Vector Dark Matter
A hidden SU(2) gauge sector broken to a massless dark photon can produce vector dark matter via freeze-in with portal couplings near 10^-7.
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Constraints on millicharged particles from nuclear gamma-decays
Nuclear gamma cascades in reactors produce millicharged particle pairs, giving the strongest constraints on millicharge for masses between 0.7 and 2 MeV.
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Search for millicharged particles in proton-proton collisions at $\sqrt{s} = 13.6$ TeV
No millicharged particles were found in 124.7 fb^-1 of 13.6 TeV data; milliQan sets the strongest limits to date for masses >= 0.45 GeV and charges <= 0.24 e.
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DarkNESS: A skipper-CCD NanoSatellite for Dark Matter Searches
A mission design paper describing how a skipper-CCD CubeSat in low Earth orbit could search for strongly interacting sub-GeV dark matter and decaying dark matter X-rays.
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Constraints on Strongly-Interacting Dark Matter from the James Webb Space Telescope
JWST NIRSpec dark calibration images exclude previously allowed high-cross-section parameter space for sub-GeV dark matter coupled to an ultralight dark photon, for subcomponent fractions as low as about 0.01%.
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Stellar probes of dark sector-photon interactions
Stellar cooling observations exclude dark-photon form-factor couplings below effective mass scales of roughly 10^9 GeV for dipoles and 100 GeV for dimension-six operators for dark states up to about 40 MeV.
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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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Can Q-balls describe cosmological and galactic dark matter?
Q-balls made of a millicharged complex scalar field are proposed as a single dark matter candidate that behaves as CDM on cosmological scales and produces MOND-like galactic dynamics through a superfluid phase.
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Millicharged Particle Constraints from Asymptotic Giant Branch Stars
New upper bounds on millicharged particles (masses 10-100 keV, charges down to 5e-13) from the AGB-to-HB star ratio in globular clusters, improving prior limits by up to two orders of magnitude.
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Underground Production of Electromagnetic Dark States by MeV-scale Electron Beams and Detection with CCDs
Proposes underground MeV-scale electron-beam production of millicharged or dipole fermions followed by CCD detection to access unconstrained parameter space.
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Measurement of Downward-going Milli-charged particles beyond GZK cutoff at the Pierre Auger Observatory
The paper derives 90% C.L. upper limits on milli-charged kinetic mixing from a private fit to Auger hybrid data and claims a newly excluded region, but the analysis is not reproducible and the text is internally inconsistent.
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Summary Report of the Physics Beyond Colliders Study at CERN
The Physics Beyond Colliders report updates the case for a broad non-collider experimental programme at CERN, arguing it is essential for exploring dark sectors, neutrino physics, and QCD.
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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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