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Meeting to discuss Kaon-LT Efficiencies for Normalized Yield
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22-Jun-02
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(Notes by GH and SJDK)
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Attendees: Stephen Kay, Garth Huber, Ali Usman, Richard Trotta, Vijay Kumar
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Ali Usman
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---------
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- shows Heep COIN data/MC comparo using Richar's script
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- Richard tried to automate the charge normlisation
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- Didn't seem to work particularly well
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- Data ends up far smaller than SIMC
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- Manual vs automated calculation
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- Dummy charge is almost exactly correct, since it's only one run
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- Data number is way off
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- 40% of manual calculation
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- RT - Probably got the reason, hadd doesn't do scalers correctly
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- AU's manual calculation was just manually grabbing numbers from report
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file for 4 files, so didn't have the hadd problem
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- GH - For consistency, *should get charge from the report file*
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- Efficiencies script can just grab this anyway
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- New cuts file with Singles and Coin track efficiencies
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- All events now processed, so will take longer to process
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- SK - Test a very large file, how long does it take?
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- I'll try and find a very large file
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- the output ROOT file should only contain "loosely good" events, to save
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space and processing time. GH calls this "skimmed data"
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- Skim cuts:
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- good COIN events w/tracks in both spectr
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- good delta cuts on both spectr
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- No PID cut on SHMS, loose HMS-CAL cut for electrons
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- GH: Need to be careful when including detector cuts, though
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- e.g. When was the HMS cherenkov mirror fixed?
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- Had a large crack across it, completely broken
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- Was replaced June 2018 - https://logbooks.jlab.org/entry/3576642
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- *RT will make a plot of HMS eff vs (x,y)* [similar to what is
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done for HGC] from the skimmed data, to make sure all is okay
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- a 2nd explanation for the narrower Pmiss, Emiss peaks by SIMC compared to
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data that Ali sees could be that the assumed beam energy spread in the SIMC
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input file is too small
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- Arc energy measurement doesn't include energy spread -> Check with DG on
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*where we can get energy spread info*
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- Beam energy width broadens with pass # and beam energy
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- Wider as a percentage of a larger number, so it's a lot,
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particularly for 5-pass 10+ GeV beam
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- Someone will need to chase down someone at JLab regarding this
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- An example log entry - https://logbooks.jlab.org/entry/3909335
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Richard Trotta
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--------------
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- Was seeing randoms in Heep coin time plot
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- *need to place cuts around prompt peak and do random subtraction*
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- also need to investigate MM, to see if there is an inelastic contribution
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at higher energy that needs to be cut out
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- After scaling MC data, shapes actually look OK on HeeP data
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- Just need to sort out the charge normalisation
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- Shapes of missing momentum are very odd
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- Discussed in meeting yesterday (KaonLT meeting)
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- Eqns between SIMC/hcana are different for missing momentum etc
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- RT/AU probably have to fix this, but it's better to try simpler
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solutions first, such as the beam energy spread
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- Vijay sees similar effect but much smaller due to lower energy
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- Efficiencies script
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- grabs kin from standard.kinematics
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- Cer Effs, from Vijay's script, but not yet incorporated
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- pi-Abs corr and Target Info, to do
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- Time added in csv script
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- Keys in dict
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- Just need new variables from Ali
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- GH - Would be nice to have a quick demo w/o the variables you're waiting
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on from Ali
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- Plots for Vijay's Hall A/C talk
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- RT will make some plots of Effs vs Run #
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- AU will finish template files
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- Aim to reprocess KaonLT replay (all data over the weekend)
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- AU raises issues with the *Calorimeter Effs*
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- reminder that everyone needs to do a study for their assigned run periods
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- one person can do a study for their run period, and others then just
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optimize the cuts for theirs, and not start from scratch
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Next meeting:
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- Mon Jun 13 @ 15:00 Eastern
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