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HF PWG Meeting Minutes by Zhenyu - 2014/12/11
1) D* in pp 500GeV Run11 HT - David
Several progresses in finalizing the analysis were presented: effective cross section for BHT1 trigger, pT binning, BHT1 trigger efficiency, systematic uncertainties on tracking efficiencies. The BHT1 cross section from 2009 Vernier scan, detector simulation, and N_events divided by luminosity are consistent within uncertainties. The final D meson cross section nevertheless does not depend on the BHT1 cross seciton. pT binning was optmized so that the raw yield of D* mesons in each pT bin is about the same, and that the systematic uncertainties are smaller than statistical ones. The BHT1 trigger efficiency estimation was redone, but now taking into account the BHT1 trigger bias on vertex reconstruction. The obtained inclusive pi yield is consistent with other measurements (UA1, or rescaled 200 GeV PHENIX/STAR result). The systematic uncertainties related to tracking effciiencies (NHitFit and DCA cuts) are estimated.
Action Item 1: It is noticed that there is a systematic difference in D* peak width between data and toy model. It was suggested that the PAs contact Yifei and Xin about what they did for run09 analysis which shows consistency between data and full D* embedding. It was also suggested that the PAs compare the D* peak mean between data and simulation.
Action Item 2: The PAs will investigate the correlation between the signal yields extracted from sideband and wrong sign methods to see if the results from the two methods are consistent within statistical uncertainties, and if so, drop the systematic uncertainty assigned to cover the difference between the two methods.
Action Item 3: Do the signal extraction using likelihood fit to check if the current results from chi2 fit underestimate.
Action Item 4: for BHT1 trigger efficiency, check if the power-law fit to UA1/PHENIX/STAR data and extrapolated to higher pT is consistent with Pythia.
2) J/psi-h correlation in pp 500GeV Run11 HT - Hui
Hui presented a study on possible J/psi-hadron and J/psi-proton correlation studies in order to measure B->J/psi contribution, and J/psi CSM vs COM production mechanisms. The data QA, and extracted raw J/psi yields were presented
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