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Explore the groundbreaking discovery of the J particle and its revolutionary impact on particle physics through this conference lecture delivered at ICBS2025. Learn about the experimental methods and instrumentation developments for electron-positron experiments at DESY that led to the historic J particle experiment at Brookhaven National Laboratory in November 1974, an event known as the "November Revolution" in particle physics. Discover how researchers achieved the extraordinary signal-to-background rejection ratio of one in ten billion required to search for massive photons (vector mesons) beyond the three traditionally known ones with masses around 1 GeV. Examine the evolution of high-energy electron and positron experiments, both terrestrial and space-based, that followed this discovery and were designed to test electroweak theory while exploring fundamental questions about dark matter and antimatter in the universe.
