PrimEx note 60 has been posted at http://www.jlab.org/primex/primex_notes/primex_notes.html Search of new physics via eta rare decays (from proceedings of Chiral Dynamics '09) Liping Gan, Ashot Gasparian July 6, 2009 PDF: http://www.jlab.org/primex/primex_notes/CD2009_liping.pdf