The emiT experiment at NIST aimed to detect time-reversal symmetry violation in neutron beta decay, which could help explain the matter-antimatter asymmetry in the early universe. The experiment measured electron-proton coincidence events from polarized neutrons and found no significant asymmetry, consistent with the Standard Model. However, the improved detector system and understanding of systematic effects provide a path for more sensitive tests of time-reversal invariance in future experiments.
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