HF-PWG minutes 2017/11/09

1) Upsilon in Run14 200 GeV AuAu via di-electron channel - Oliver Matonoha
a. Suggest to look at new productions of Run14 prod_low, mid, and high data, where HFT is not used in the tracking. This should make the efficiency determination easier since primary tracks are used in the analysis
b. Look at TPC vz distribution in the data to see if |vz| < 30 cm is appropriate or a more loose cut can be used to increase statistics
c. Need to smear momentum resolution in embedding by matching to J/psi width, in order to obtain the line shape. Currently, the line shapes can not be well described by Crystal-ball functions. Need to investigate why this is the case, and whether additional components are needed.
d. Compare the like-sign distributions for same event and mixed event in different centrality bins to check whether they match or not
e. Use simulation to determine the correlated background shape. 
f. Try to fix the ratio of Y(2S):Y(3S) to facilitate the fit
g. it will be nice to compare the trigger turn on curve from data to that from embedding. Need to check the electron purity between MB and HT2 data. One can also calculate the equivalent number of MB events to absolutely normalize the electron distribution in MB data, and then compare to HT2 data.

2) MB events estimation for BBCMB trigger in Run15 200 GeV pp - Zaochen Ye
a. Investigate the probability of random coincidence for BBCMB trigger by looking into the coincidence time window used online. If the random coincidence turns out to be negligible, then one does not need to use VPD triggered events to infer the equivalent number of BBCMB events
b. Slide 4: check whether the runs above the red line come from high luminosity
c. Slide 2: for events with more than 1 in-bunch collisions, one needs to estimate the BBC trigger and vertex finding efficiencies for them specifically