Time Evolution of Decay Spectrum in K^0, K^0 bar -> pi^+ pi^- e^+ e^-

Details Time Evolution of Decay Spectrum in K^0, K^0 bar -> pi^+ pi^- e^+ e^- Time Evolution of Decay Spectrum in K^0, K^0 bar -> pi^+ pi^- e^+ e^-

2000-06-29

arxiv.org/abs/hep-ph/0006336v2

Phys.Lett. B489 (2000) 300-308

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 8 figures, minor typos corrected, to appear in Phys. Lett. B

Scientific paper

10.1016/S0370-2693(00)00948-5

We consider the decay K^0 (K^0 bar) -> pi^+ pi^- e^+ e^- of a neutral K meson prepared in a state of strangeness +1 (-1). The time evolution of the state produces remarkable time-dependent effects in the angular distribution of the pi^+ pi^- e^+ e^- system. These effects are correlated with the time-dependence of the photon polarization in the radiative decay K^0 (K^0 bar) -> pi^+ pi^- gamma. We study, in particular, the CP-odd, T-odd term in the distribution d Gamma / d phi of the angle between the pi^+ pi^- and the e^+ e^- planes. We also give the spectrum in the case that the decaying meson is an incoherent mixture of K^0 and K^0 bar, and discuss the case of K_S regeneration in a K_L beam.

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