1) Data and Simulation DCA comparison - Kunsu
Kunsu did not attend the meeting but sent slides. He compared DCA and conversion vertex position distributions for photonic electron background (invmass<0.01 GeV) between data and simulation. The Dalitz decay and photon conversion electrons in data are separated based on conversion vertex, R<2 vs 2<R<4 cm, while simulation is from Xiaozhi using FastSim for Dalitz decay and full GEANT simulation for photon conversions. For data the relative yield between Dalitz decay and photon conversion electrons seem to be smaller than naive expectation, which may be due to too tight invMass cut that removed most of Dalitz decay electrons. The comparison between data and simulation for Dalitz decay looks much better than that for photon conversion electrons. It is agreed that in order to have a better understanding of such differences and the background shape in general, detailed detector simulation studies and data-simulation comparisons will be needed.

2) Simulation updates - Xiaozhi
Xiaozhi presented first results from Hijing+gamma geant simulation studies, and showed photonic electron pair conversion vertex position and DCA distributions.

3) Updates - Jie
will use FastSim for feasibility study of eK pairs