1. Tests of CP and CPT symmetry with positronium.
- Author
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Namba, T., Nishihara, K., Yamazaki, T., Asai, S., and Kobayashi, T.
- Subjects
- *
POSITRONIUM , *ELECTRONS , *NUCLEAR reactions , *CP violation , *QUANTUM theory , *PARTICLES (Nuclear physics) , *NUCLEAR physics - Abstract
The 3γ decay of spin-aligned triplet positronium can be used to test CP (C = charge conjugation, and P = parity operation) invariance in the lepton sector. The angular correlation (ŝ·k1)(ŝ·k1×k2) is used for this test, where s is the positronium spin and |k1|>|k2|>|k3| are the γ momenta. We designed a new detector to test this symmetry at the 10-3 level. This detector consists of a magnet, a β+ 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 CPT (T = time reversal) symmetry can be also tested. In this case, the angular correlation (ŝ·k1×k2) is used. This test will be started after the CP test is finished. [ABSTRACT FROM AUTHOR]
- Published
- 2008
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