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DAMA/LIBRA and leptonically interacting Dark Matter
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We consider the hypothesis that Dark Matter (DM) has tree-level interactions only with leptons. Such a framework, where DM recoils against electrons bound in atoms, has been proposed as an explanation for the annually modulated scintillation signal in DAMA/LIBRA versus the absence of a signal for nuclear recoils in experiments like CDMS or XENON10. However, even in such a leptophilic DM scenario there are loop induced DM-hadron interactions, where the photons emitted from virtual leptons couple to the charge of a nucleus. Using a general effective field theory approach we show that, if such an interaction is induced at one or two-loop level, then DM-nucleus scattering dominates over DM-electron scattering. This is because the latter is suppressed by the bound state wave function. One obtains a situation similar to standard DM-nucleus scattering analyses with considerable tension between the results of DAMA and CDMS/XENON10. This conclusion does not apply in the case of pseudoscalar or axial vector coupling between DM and leptons, where the loop diagrams vanish. In this case the explanation of the DAMA signal in terms of DM-electron scattering is strongly disfavored by the spectral shape of the signal. Furthermore, if DM can annihilate into neutrinos or tau leptons, the required cross sections are excluded by many orders of magnitude using the Super-Kamiokande bound on neutrinos from DM annihilations in the Sun.
Forward citations
Cited by 11 Pith papers
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Constraining the heavy leptophilic neutral gauge bosons through the $Z\to\ell^+\ell^-$, $W^\pm\to\ell^\pm\nu_\ell$, and $h\to\ell^+\ell^-$ decays
One-loop corrections to W/Z/h leptonic widths exclude heavy leptophilic Z' regions (M ≳ O(1) TeV, g' ≳ 0.4) beyond LEP-2 and neutrino-trident limits.
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Electronic structure of liquid xenon in the context of light dark matter direct detection
Liquid xenon's effect on dark matter-electron scattering can be captured by atomic wave functions combined with a liquid density of states, shifting exclusion limits by up to a factor of two.
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A general upper bound on the light dark matter scattering rate in materials
Using Kramers-Kronig relations, the paper derives a material-independent upper bound on the rate of dark matter induced electronic transitions for couplings to density, spin, and currents, and evaluates how close Ge, ...
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Many-body atomic response functions of xenon and germanium for leading-order sub-GeV dark matter-electron interactions in effective field theory
The authors provide full (MC)RRPA atomic response functions for xenon and germanium for sub-GeV dark matter-electron scattering, and report a low-energy spin-dependent response distinct from the spin-independent one.
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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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Relativistic Atomic Effects of Dark Matter Electron Scattering
A first-principles QFT treatment of dark matter scattering off atomic electrons shows that free-electron factorization can fail and that relativistic Dirac wave functions reduce the xenon atomic factor by 30-50% relat...
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Super-Kamiokande Strongly Constrains Leptophilic Dark Matter Capture in the Sun
Super-Kamiokande data constrains the DM-electron scattering cross-section for leptophilic dark matter to ~4e-41 cm2 below 100 GeV, exceeding direct detection by over an order of magnitude.
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A Compatibility Check: Low-Scale Chiral $U(1)_X$ Theories Vs. $(g-2)_e$ Anomaly
Three benchmark chiral U(1)_X models cannot simultaneously explain the electron (g-2) anomaly and pass current neutrino-scattering bounds, so they are excluded as complete new-physics explanations.
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Muonphilic asymmetric dark matter at a future muon collider
Muonphilic portals to fermionic asymmetric dark matter are constrained by existing data and can be probed further by 3 and 10 TeV muon colliders.
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Dark matter in the Randall-Sundrum model
A Randall-Sundrum graviton-mediated dark matter model with non-universal couplings can accommodate scalar, vector, fermion, and spin-3/2 dark matter while remaining consistent with relic density, direct detection, ind...
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Constraints on a Light Leptophilic Scalar from Dark-Sector Couplings
A parameter space analysis of a leptophilic scalar mediator model for Majorana dark matter yields a viable sub-GeV region after applying relic density, cosmological, astrophysical, and laboratory constraints.
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