GUT. D2. CP violation in the quark sector. CP violation in the lepton sector. D1. D1’. magnet. D2’. ⇒ CP violation. o-Ps→3γ. o-Ps. o-Ps. γ. o-Ps. γ. e -. e +. γ. detector D2. detector D2. detector D1. detector D1. 137 Cs spectrum. 511-511 coincidence.
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CP violation in the quark sector
CP violation in the lepton sector
⇒ CP violation
If we assume , ・・・
M.Skalsey and J. Van House, Phys. Rev. Lett. 67 (1991)1993
Search for CP violation in the lepton sector
ICEPP Univ. of Tokyo Kazuyuki Nishihara
CP violation in the quark sector has been established, but there is no evidence in the lepton sector.
We optimized the configuration of the detectors.
・MNS matrix ?
・neutrino oscillation ?
violated at ~ 10^-3
invariance confirmed at only 10^-2
The ortho-positronium(o-Ps) provides a good system for the CP violation search.
Results of the geant4 simulation
In this setup, we can store
1.1×10^8 events / 3 months
CP violating angular correlation
enough to realize 10^-3 sensitivity
To reduce systematic errors
1) LYSO crystals
LYSO crystals provide the good energy and time resolution.
Experimentally we can derive CCP by measuring the following asymmetry
LYSO crystal samples (2mm×2mm×10mm)
⇒reduction of the background
⇒stable against the pileup
2) 2 pairs of the detectors
Preparing 2 pairs of the detectors enables us to correct the position of the source.
(depends on the detector configuration)
⇒N+,N－depends on the direction (φ) of an external magnetic field.
If CCP =0, N+= N－= N0