A Report on the Ground at KEK: Electrons and Positrons Collide for the first time in the SuperKEKB Accelerator
At 0:38am (GMT+09:00), April 26, 2018, several hours after KEK accelerator team found the collision point of electrons and positrons accelerated and stored by the SuperKEKB accelerator, one hadronic event produced by electron-positron annihilation (matter-antimatter annihilation), was reconstructed and displayed on a screen by the Belle II detector at the Tsukuba campus of KEK in Japan.
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