Abstract
We present the study of massless dark photons in the decay of in the J-PARC KOTO experiment. The massless dark photon is different from the massive dark photon because it does not mix directly with ordinary photons, but it could interact with SM particles through direct coupling with quarks. In some theoretical predictions, the can be as large as \U0001d4aa(10-3), which is well within the sensitivity of KOTO. Because of the lack of kinematic constraints, searching for could be challenging, but the hermetic veto system of KOTO provides a unique opportunity to probe for this decay. We used three techniques to suppress the neutron background, based on machine learning, Fourier analysis, and both-end readout. We will present the background suppression result based on data collected in 2020.
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