Diffractive EM-Jet A_N at Forward Rapidities With FMS and EEMC

Motivation:

• UCR 2018 Proposal
• The RHIC Cold QCD Plan (See Diffraction)
• EIC White Paper (See Diffractive Physics)
• Beam Use Request for Run 15-16

Dataset:

• Run 17 (Primarily) and Run 15 (Initially)
• Using Detectors FMS and EEMC with RP.

Analysis Tools:

• UCR Spin Analysis Tools Github repository: BrightStar

Resources:

• STAR Jet Reconstruction code: See the blog post here
• For Jet analysis, see related theses, for example:
  • Grant Webb’s thesis
  • Zilong’s thesis
  • Kevin’s thesis
  • [Suvarna’s thesis]
• Chong’s FMS Calibration Notes

Workflow

 Students Meeting ----> UCR Meeting ----> FMS Meeting -------> PWG Meeting -----> Working on
   	   /\ 	    	      	      	    			     	     	    feedback
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			     C++ (basic syntax)
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			     Object Oriented C++ Programming
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			     Linux Commands / Unix    
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	     User Analysis<------- ROOT<-------------------------------------------------
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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 approprite function for DST generation.
• Submit the jobs using STAR scheduler as: star-submit sumsJobs.xml

Critical Concepts

• Diffractive Events
• Jet Finding Algorithm
• Pileup or Accidental Background
• Underlying Events
• Unfolding

Previous presentations:

• Diffractive jet basic study (12/07/2020, Note: EEMC is not correct)
• FMS Hot Channel QA (01/22/2021)
• EEMC QA (02/12/2021)
• FMS EEMC RP QA in PWG (03/31/2021)

Exercises

• Motivation

• Understand Jet Finding Algorithm:
  • Understand how Anti-k_t algorithm works
  • Implement basic jet finder program:
    • Check FastJet Manual and take their example (first one, ~15 lines of c++ code), compile it and run it. Access jet properties of identified jets. Next pay changing the constituent particles.
    • Now go back to StJetMaker2012.cxx and understand different steps.

• Generate DST for EM-jets in FMS and EEMC

• Perform QA studies
  • Check if there is any hot/bad/dead FMS channels: Make jet y vs x plot for each fill
  • For the fills having hot areas, find the corresponding detector and channel ids and add the detector and channel ids to hot channels list
  • Once hot channels list is updated, generate EM-jet for that fill again and check if the hot area is gone.
  • Make a plot to show number of jets per run normalized by number of JP0 trigger: along x axis is the run number (or could be run index) and y axis plot number of em-jets nurmalized by number of JP0 trigger
  • EEMC Tower QA Studies
  • RP QA Studies
• Event Selection:
  • Complete list of cuts
  • Pileup or accidental events
  • Develop algorithm to remove pileup