CP Violation in the Decay $η\toπ^+π^-γ$

Details CP Violation in the Decay $η\toπ^+π^-γ$ CP Violation in the Decay $η\toπ^+π^-γ$

2002-01-21

arxiv.org/abs/hep-ph/0201191v3

Mod.Phys.Lett. A17 (2002) 1489-1498

Physics

High Energy Physics

High Energy Physics - Phenomenology

new references added,accepted for publication in Mod.Phys.Lett

Scientific paper

10.1142/S0217732302007697

We study the CP violating effects in the decay of $\eta\to\pi^+\pi^-\gamma$. We show that to have CP violation in the decay, one has to consider both linear and circular photon polarizations. In the standard model, the polarizations are vanishingly small. However, model-independently, i.e. using only experimental constraint imposed by the limit on $Br(\eta\to\pi^+\pi^-)$ it can be up to $O(10%)$. We also explore various possible operators and we find that the tensor type operator, possibly arising from a nonzero CP violating electric dipole moment of the strange quark, can induce a sizable linear photon polarization.

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