| Budget Amount *help |
¥45,760,000 (Direct Cost: ¥35,200,000、Indirect Cost: ¥10,560,000)
Fiscal Year 2020: ¥8,450,000 (Direct Cost: ¥6,500,000、Indirect Cost: ¥1,950,000)
Fiscal Year 2019: ¥8,710,000 (Direct Cost: ¥6,700,000、Indirect Cost: ¥2,010,000)
Fiscal Year 2018: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2017: ¥8,190,000 (Direct Cost: ¥6,300,000、Indirect Cost: ¥1,890,000)
Fiscal Year 2016: ¥12,220,000 (Direct Cost: ¥9,400,000、Indirect Cost: ¥2,820,000)
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| Outline of Final Research Achievements |
Using high-statistics data collected at the KEKB asymmetric energy electron-positron collider, the tau decay of 4-body final state (charged pion, neutrino, electron and positron) was observed for the first time. The partial branching fraction was measured to be (1.46-3.01) times 10-5. This is the smallest decay rate of tau lepton determined to date. In addition, an upper limit is set on the branching fraction of tau decaying to charged pion, neutrino, positive muon and negative muon to be 1.14 times 10-5 . The obtained results are consistent with the standard model predictions and can help constrain models beyond the standard model.
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