The STAR experiment

Minutes:

David has presented results from running the GMT code:

There are three attached sets of slides. Each compares the TTrees generated with a bfc chain:

1. https://drupal.star.bnl.gov/STAR/system/files/gmt_lib_check.pdf compares trees generated under dev & .DEV2, in which the .DEV2 run includes a bfc chain option for KFVertex
2. https://drupal.star.bnl.gov/STAR/system/files/DEV2_v2_noKFVertex.pdf is the same as 1. above, but .DEV2 does not include the bfc chain option for KFVertex
3. https://drupal.star.bnl.gov/STAR/system/files/DEV2_KFVertex_effect.pdf compares the .DEV2 with the KFVertex & .DEV2 without the KFVertex

If the KFVertex option is on there is more events, when turned off the number of event basically agree. However the number of entries in DEV is two times what is reconstructed in .DEV2.
The entries in the final ntuple are coming from tracks being matched to MTD hits. The question now is if the actual number of hits reconstructed in the detector is also different between the libraries.

Minutes:

1. Yuri has done a transfer of 7.7GeV data to disk space leased by PAC that we can use for the studies at /gpfs01/star/pwg_tasks/TF_TrkEff

2. MTD software is now running in both .DEV2 and dev and returns data trees. Only problem remains that in dev there is a spurious crash at the end after the data is saved. David is now
comparing the outputs.

3. Yang He has presented QA studies of embedding in isobar data https://drupal.star.bnl.gov/STAR/system/files/isobar_embeding_testrun_QA_March18.pdf.
There is a strange pt-dependence observed in efficiency. It was discussed and suggest to look into 2D eta-phi dependence to see if it is related to the bad TPC sector.
It was discussed the effect effect of missing TPC sector could show up through nHits cut.
It was also suggested to try simulation with realistic pt spectra since some effects could be due to reweighting.