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Search for CP violation in the lepton sector - PowerPoint PPT Presentation


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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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Presentation Transcript

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

137Cs spectrum

511-511 coincidence

If we assume , ・・・

Our Goal

ΔCCP~10^-2

φ[°]

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

Physics Motivation

Detector Setup

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.

・CKM matrix

・B physics

・MNS matrix ?

・neutrino oscillation ?

violated at ~ 10^-3

invariance confirmed at only 10^-2

Ortho-Positronium System

The ortho-positronium(o-Ps) provides a good system for the CP violation search.

Statistics

Results of the geant4 simulation

In this setup, we can store

1.1×10^8 events / 3 months

(22Na 100kBq)

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.

Detection Principle

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.

  • Rotation of the Magnet

  • By rotating the magnet, we can check whether the observed A is

  • a real asymmetry or not.

(depends on the detector configuration)

⇒N+,N-depends on the direction (φ) of an external magnetic field.

If CCP =0, N+= N-= N0

magnet

ratio


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