Large Effects of CP- and T-Violation in K^0 Decay

Details Large Effects of CP- and T-Violation in K^0 Decay Large Effects of CP- and T-Violation in K^0 Decay

2000-11-10

arxiv.org/abs/hep-ph/0011149v2

Nucl.Phys.Proc.Suppl. 99B (2001) 127-131

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 6 figures, talk at International Conference on CP Violation Physics, 18-22 September 2000, Ferrara, Italy, minor typo

Scientific paper

10.1016/S0920-5632(01)01371-8

The epsilon-impurity of the K_L wave-function gives rise to a huge CP-violating effect in the decay K_L -> pi^+ pi^- gamma which is hidden in the polarization state (Stokes vector) of the photon. One component of the Stokes vector is CP-odd and T-even, and may be identified with circular polarization. Another component is CP-odd and T-odd (``oblique polarization'') and reveals itself as a large asymmetry (14%) in the decay K_L -> pi^+ pi^- e^+ e^-. Striking time-dependent effects are predicted in the angular distribution of the pi^+ pi^- e^+ e^- system emanating from an initial K^0 or K^0bar state.

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