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Dark Matter, Millicharges, Axion and Scalar Particles, Gauge Bosons, and Other New Physics with LDMX
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The proposed LDMX experiment would provide roughly a meter-long region of instrumented tracking and calorimetry that acts as a beam stop for multi-GeV electrons in which each electron is tagged and its evolution measured. This would offer an unprecedented opportunity to access both collider-invisible and ultra-short lifetime decays of new particles produced in electron (or muon)-nuclear fixed-target collisions. In this paper, we show that the missing momentum channel and displaced decay signals in such an experiment could provide world-leading sensitivity to sub-GeV dark matter, millicharged particles, and visibly or invisibly decaying axions, scalars, dark photons, and a range of other new physics scenarios.
Forward citations
Cited by 8 Pith papers
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Light Dark Matter Discovery Potential and Model Selection at LDMX
LDMX Phase II is projected to discover R=2.5 thermal complex-scalar DM at 5σ and to discriminate dark-photon electromagnetic-moment models via 2D Bayes factors.
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Light Vector Dark Matter via a Magnetic Dipole Portal: Bridging Direct Detection and Fixed-Target Searches
A sub-GeV vector DM model with a magnetic dipole portal is studied at LDMX/NA64, but the claimed viable region relies on an unjustified thermal equilibrium assumption.
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Direct Detection of Leptophobic Dark Matter with Electronic Collective Excitations
Leptophobic dark matter can excite plasmons in silicon through hadronic loops, and SENSEI data now constrain its nucleon cross section down to ~1e-31 cm^2 in the sub-MeV mass range.
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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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Proof of principle for a light dark matter search with low-energy positron beams at NA64
A 70 GeV positron-beam missing-energy search at NA64 found zero signal events and set new dark photon limits, demonstrating the feasibility of a future low-energy positron program.
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New Thermal-Relic Targets for sub-GeV Dark Matter Direct Detection
For sub-GeV dark matter coupled to anomaly-free U(1) mediators, thermal freeze-out predicts electron-recoil cross sections that are already excluded for electrophilic mediators but still viable and discoverable for el...
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Probing Light Dark Particles in Neutrino Scattering Experiments
A dark fermion produced in neutrino scattering could be probed at DUNE's near detector up to cutoff scales near 1 TeV, beyond CHARM II and LEP, while current COHERENT/CONUS+ limits stay below LHC bounds.
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Sub-GeV Dark Matter Under Pressure from Direct Detection
PandaX-4T S2-only data yields world-leading sub-GeV dark matter-electron scattering limits for heavy mediators in the 20-200 MeV range, although the result largely overlaps with the collaboration's own just-released analysis.
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