HF-PWG minutes 2018/04/12

1) D+/- production in run16 AuAu - Jan Vanek
a) Exclude the 1-2 GeV/c bin from the final results due to unreliable signal extraction
b) Only concentrate on 0-10% central collisions due to the lack of vertex resolution correction for more peripheral bins
c) Slide 11: apply TOF PID cuts to deduce the efficiency for hybrid method

2) D* production in run14 AuAu - Yuanjing Ji
a) Slide 10: use the differential invariant yields shown on slide 8 to calculate the integrated yield
b) Slide 12: compare the variations between the corrected D* and D0 for topological cut changes. If they are consistent, one can use the D0 uncertainty for D* for this particular source.
c) use the momentum resolution from HIJING in fast simulation

3) Update - bottom analysis - Yifei Zhang
a) Slide 4: add a ratio plot to compare the errors on the Levy fit and the error bars on the D0 data points. Need to explain how the systematic uncertainties on the D0 measurements are taken into account.
b) Show the uncertainty of the parametrized D0 spectrum above 10 GeV/c where no measurement is available.
c) Slide 4: need to add uncertainty for the Ds spectrum shape. Assuming it is the same as D0 might not be well motivated given that the coalescence contribution could have a strong pT dependence. 
d) Slide 5: suggest to include more models as an estimate of the Lc spectrum shape uncertainty. Please explain how the uncertainty on the measured Lc/D0 ratio is taken into account in the final results.
e) Slide 6: please make a ratio of D+ to D0 for 0-80% to see if they are consistent. How large are the uncertainties on the D+ measurements and have they been taken into account? Given that D+ is the dominant contributor to NPE, how large of the effect is due to the lack of vertex resolution correction for peripheral bins.
f) Slide 7: the cross-section numbers listed in the table are for 10-60% for Lc and 10-40% for other species. Need to explain how to extrapolate these numbers to 0-80% and how large the uncertainties are. 
g) Slide 7: given that only the D0 spectrum is corrected for vertex resolution effect, we need to understand the effect for other particle species even though the contributions from peripheral collisions to 0-80% MB collisions are small.
h) Slide 8: make a ratio plot of all the curves and data points in the figure to (c->e). Add the old plot for the Run10/11 paper from which the conclusion that D0 and NPE measurements are consistent was drawn.
i) Add a few slides to explain exactly what errors are included on slide 12 and what errors are shown in the figure on slide 11. Specifically, how large are the global uncertainties and what are the contributions?
j) Add a plot to demonstrate how to transfer the D0 uncertainty to NPE uncertainty