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

Abstract

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.

arXiv comment5 pages, 6 figures, talk at International Conference on CP Violation Physics, 18-22 September 2000, Ferrara, Italy, minor typos corrected

References in corpus (3)

• Observation of CP Violation in K(L)->pi+pi-e+e- Decays
• Violation of Time Reversal Invariance in the Decays K_L -> pi^+ pi^- gamma and K_L -> pi^+ pi^- e^+ e^-
• Time Evolution of Decay Spectrum in K^0, K^0 bar -> pi^+ pi^- e^+ e^-