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The recently reported excess in XENON1T is explained by new leptonic forces,which are free from gauge anomalies. We focus on two scenarios with and withoutdark matter. In Scenario #1, the gauge boson of gauged lepton numberU(1)$_{L_e-L_j}$, $j=\mu$ or $\tau$ provides non-standard interaction betweensolar neutrino and electron that enhances the number of electron recoil eventsin the XENON1T detector. In Scenario #2, the new gauge boson exclusivelycouples to electron and dark matter, then cosmic-ray electrons can transfertheir momenta to dark matter in halo. The boosted dark matter generates theelectron recoil signals of ${\cal O}(1)$ keV. The dark matter, aided by the newgauge interaction, efficiently heats up a neutron star in our Galaxy more than$\sim1500$ K as a neutron star captures the halo dark matter. Therefore, wepropose to utilize the future infrared telescope to test our scenario.

Leptonic New Force and Cosmic-ray Boosted Dark Matter for the XENON1T Excess