minutes HF PWG Aug_29

Bug fix in Upsilon efficiency in dielectron channel - Shuai Yang
--- Bug from incorrect weighting of events when calculating efficiency. Impact ~10% in 0-60% centrality
--- Currently will scale the results by correction factor obtained in broad vs Ncoll weighted fine centrality bins. Will switch to using correct event weights in future

Update on Ds analysis- Chuan Fu
--- Updated results with new cuts pushing to lower pT and peripheral centrality
--- Question on how the D0 yield is calculated in the pT bins used in this analysis. Chuan will clarify via email
--- Also on where to plot the data point on pt axis as the mean pt of Ds and D0 can be different. Chuan will look into it
--- Suggestion to split the 10-40% bin for the centrality dependence plot on S.25 to have more continuous coverage of Npart
--- Chuan intends to cross-check corrected yields of D+- using the same cuts and compare to measurements from pipiK channel.