Pion and Dijet A_LL at Intermediate Rapidities With EEMC

Resources

• EEMC NIM Paper
• 2006 PRD Paper Web Page
• 2006 Paper Link
• All Past EEMC Analyses Page
• Similar Analysis Using Run 12
• Run 13 Analysis

Dataset

• RHIC Run 15
• get_filelist commands: get_file_list.pl -keys ‘path,filename’ -cond ‘storage!=hpss,filetype=daq_reco_muDst,filename~st_physics,production=P16id,trgsetupname=production_pp200long(2)_2015’ -limit 0 - distinct -delim ‘/’

Analysis Tools

• UCR Spin Analysis Tools Github repository: BrightStar
• Calss references for EEMC pion Tree: here
• Class reference for EEMC DST event information:here

 Students Meeting ----> UCR Meeting ----> FMS Meeting -------> PWG Meeting -----> Working on
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			       STAR Analysis (StRoot)-----------------> Generate DST ---|   

How to generate DST files

• Download and compile BrightSTAR analysis library on RCF following the instructions here.
• Modify sumsJob.xml file to update your trigger/dataset information and various paths.
• Replace the function called in jobMacro with RunEEmcNanoDstMaker.
• Ensure config/config.cgf has ENABLE_EEMC and ENABLE_EVT set to 1 and other detectors to 0.
• Submit the jobs using STAR scheduler as: star-submit sumsJobs.xml

How to read the DST

• Follow this example here.

Excercises

• Document get_filelist command

• Check that we have enough longitudinal dataset to do the analysis: total number of runs, number of events, number of fills, approximate total file sizes

• Generate DST using scheduler
  • Merge multiple files into one file
• Make basic QA plots:
  • Access DST (root file) using macro (understand)
  • Access two root files simultaneously (part1 and part3) (root exercise) and read event and pion info
  • Pion invariant mass
  • pion energy, p_T, zgg etc
  • Number of pions per run normalized by trigger for each trigger type
• Ensure you can process all events from all files from script:
  • Separate root files by run number, use hadd to merge multiple files

  Now make the following plots:

  • Number of pions vs Run number
  • Number of EHT0 trigger vs run number
  • Number of pions normalized by number EHT0 trigger per run vs run number
  • Access spin information and plot spin state for all events from all files
• Understand the pion plots:
  • Given two photon energies E1 and E2 and their opening angle, derive expression for these quantities: pion invariant mass M, Z_gg, d_gg. From the expression, try to interpret how they will change will photon/pion energy
  • From the data, plot M, Z_gg, d_gg, p_T, E, p, pion y vs pion x, pion eta, pion phi.
  • Apply your understanding from the derivation to make sense of the plots.
  • Use photon camdidates from the photon branch to calculate pion invariant mass and compare it pion invariant mass from pion branch.
• Towards Asymmetry Calculations:
  • Make a plot showing trigger distributions among all events
  • Take the two leading triggers from your trigger distribution and for those two triggers plot pion invariant mass. Normalized the plots and super impose those two pion invariant mass plots on each other to compare them.
  • Make one or two slides explaining how to calculate A_LL and list any variables that you do not have in your analysis tree