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Dark Matter, Millicharges, Axion and Scalar Particles, Gauge Bosons, and Other New Physics with LDMX
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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 15 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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New Energy-Loss Constraints on Dark Sectors from Deeply Inelastic Scattering with Initial State Radiation
A factorization-based method is outlined to derive energy-loss constraints on dark sector particles (spin 0 to 2) from ISR-modified lepton distributions in DIS, illustrated for MeV-GeV spin-0 cases at the EIC.
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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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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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Direct-detection constraints on inelastic dark matter with a scalar mediator
Xenon data constrain inelastic fermion DM with scalar mediator for sub-MeV mass splittings through endothermic and exothermic DM-electron scattering.
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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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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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Improved limits on a new $Z'$ in $B-L$ scenarios with the NA64 experiment at CERN
NA64 reports improved upper limits on g_{B-L} for sub-GeV Z' masses using resonant production and invisible decay channels from a dataset three times larger than prior analyses.
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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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Probing inelastic sub-GeV dark matter at the DUNE near detector
DUNE's ND-LAr can probe sub-GeV inelastic dark matter parameter space consistent with relic abundance via dark Higgs-mediated annihilation, especially at large dark photon-to-DM mass ratios.
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Cornering MeV-GeV Axions and Dark Photons with LDMX
LDMX can close much of the sub-100 MeV blind spot for axions and dark photons via charged track and momentum reconstruction.
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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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Improved limits on a new $Z'$ in $B-L$ scenarios with the NA64 experiment at CERN
NA64 sets improved upper limits on g_{B-L} for sub-GeV Z' using 9.4e11 electrons on target, exceeding prior neutrino-scattering bounds in the unbroken U(1)_{B-L} scenario.
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