1) Ds efficiency using FastSim package - Md. Nasim
a) the closure test of the Ds efficiency using HIJING+GEANT is shown to the level of 2-7% depending on the topological cuts used. However, the error bar on the ratio is large. Therefore, it will be nice to reduce the error by generating more HIJING samples, which unfortunately will take quite some time.
b) need to decide how to use the closure test results: apply as correction factors or assign as systematic uncertainties. Currently the later is preferred.