- Conference date: 20–22 February 2008
- Location: Okinawa (Japan)
The 3γ decay of spin‐aligned triplet positronium can be used to test ( and ) invariance in the lepton sector. The angular correlation is used for this test, where s is the positronium spin and are the γ momenta.
We designed a new detector to test this symmetry at the level. This detector consists of a magnet, a tagging and o‐Ps creation system, γ‐ray detectors, and a turntable. The detector construction is almost finished and data acquisition will begin in this spring.
With a similar detector, the symmetry can be also tested. In this case, the angular correlation is used. This test will be started after the test is finished.
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