<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Yang,<div class=""><br class=""></div><div class=""> The slides are fine (including the fact that the results are labeled preliminary). There are a few issues that you should be aware of, particularly if there are questions from someone who knows the subject well. The prediction labeled NLO is a firm QCD prediction. This does not apply to the LO term which is only correct in the chiral limit. The Ioffe calculation is only a partial prediction since it only takes the contribution of the eta meson into account and neglects the contribution of the eta’ meson which contributes ~ 1/3 of the effect. </div><div class=""><br class=""></div><div class="">I’m enclosing my CD15 contribution which also comments on the pi0 lifetime and briefly summarizes our RMP review article. </div><div class=""><br class=""></div><div class="">regards,</div><div class="">Aron</div><div class=""><br class=""></div><div class="">Aron M. Bernstein</div><div class=""><div apple-content-edited="true" class=""><div class="">Professor of Physics, Emeritus<br class="">MIT<br class="">Cambridge, MA 02139<br class="">office: 26-419<br class="">617-253-2386</div><div class=""></div></div></div></body></html>