TL;DR
This paper reviews recent experimental and theoretical progress on the rare decay pi0 to e+e-, highlighting a significant deviation between observed data and theoretical predictions at 3.3 sigma.
Contribution
It provides an updated review of experimental results and introduces a new model-independent estimate of the decay branching ratio.
Findings
Latest KTeV data shows deviation from theory at 3.3 sigma
New model-independent estimate of decay branching
Progress in both experimental measurements and theoretical understanding
Abstract
Experimental and theoretical progress concerning the rare decay pi0 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.
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