E137 beam-dump data exclude spin-2 dark matter mediator couplings from about 8e-8 to 1e-5 per GeV for mediator masses 100 to 800 MeV, assuming equal electron and photon couplings.
Resonant probing spin-0 and spin-2 dark matter mediators with fixed target experiments
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We discuss the mechanism to produce electron-specific dark matter mediators of spin-0 and spin-2 in the electron fixed target experiments such as NA64 and LDMX. The secondary positrons induced by the electromagnetic shower can produce the mediators via annihilation on atomic electrons. That mechanism, for some selected kinematics, results in the enhanced sensitivity with respect to the bounds derived by the bremsstrahlunglike emission of the mediator in the specific parameter space. We derive the corresponding experimental reach of the NA64 and LDMX.
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The bremsstrahlung-like production of the massive spin-2 dark matter mediator
E137 beam-dump data exclude spin-2 dark matter mediator couplings from about 8e-8 to 1e-5 per GeV for mediator masses 100 to 800 MeV, assuming equal electron and photon couplings.