Rare decay π^0 \to e^+e^- as a Test of Standard Model

Details Rare decay π^0 \to e^+e^- as a Test of Standard Model Rare decay π^0 \to e^+e^- as a Test of Standard Model

2009-05-28

arxiv.org/abs/0905.4577v3

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 2 figures, extended version of the talk given at "New Physics and Quantum Chromodynamics at External Conditions" con

Scientific paper

Experimental and theoretical progress concerning the rare decay \pi^0 \to e^+e^- is briefly reviewed. It includes the latest data from KTeV and a new model independent estimate of the decay branching which show the deviation between experiment and theory at the level of $3.3\sigma$. The predictions for \eta and \eta' decays into lepton pair are presented. We also comment on the impact on the pion rare decay estimate of the BABAR collaboration on the pion transition form factor at large momentum transfer.

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