Kaon_LT Experiment

                May 31/22 PionLT/KaonLT Analysis Meeting Notes

                ----------------------------------------------

                           (Notes by GH and SJDK)

Please remember to post your slides at:

https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings

Present:

Regina - Stephen Kay, Garth Huber, Nathan Heinrich, Ali Usman, Muhammad Junaid,

   Love Preet, Vijay Kumar (arrived late due to doctor appointment)

Ohio - Jacob Murphy, Julie Roche

CUA  - Richard Trotta

JLab - Dave Gaskell

FIU  - Pete Markowitz

Richard Trotta

--------------

- AU has been very helpful fixing some scripts

   - Charge corrections/normalisations for data were off

   - GH - Lumi scan Q, are charge normalizations not done here?

   - RT - Had things a bit mixed up when doing SIMC comparison, charge

          corrections were done in Lumi Scan?

   - SIMC data looks better, recompiled SIMC

      - SIMC kept producing somewhat odd results, not sure why this should have

        been needed

   - SIMC Blue, red is data (not charge corrected)

      - HeeP Coin data

   - *Shouldn't be hard coding charge normalisations/corrections*

- Efficiencies work

   - Script to compile all relevant info to one csv file

   - AU needs aerogel positions still for cuts in report file

      - Script to get positions written, just checking a broad range

- 2 week plan

  - Better HeeP data/MC comparison with fixed charge normalisations and SIMC

    fixes

  - Aerogel positions

  - Report file part of efficiency script should be done

  - Hodoscope calibrations (hopefully!) for 2018, 10.6 GeV data

Ali Usman

---------

- HeePCoin 8.2 GeV data

   - Red data, blue SIMC, charge normalised, dummy subtracted and SIMC weights

   - Despite changes, still some shifts apparent

   - No SIMC or data re-normalization needed *GOOD*

   - No offsets, no efficiencies applied yet

   - DG - Could just grep some values and use them for now?

      - Could just do a quick and dirty correction and see how it looks

   - DG - What is spectrometer central momentum?

      - ~4.3-4.6 GeV for both

   - x/y seem to be flipped between SIMC/Data

      - Just plot the wrong way around for now?

      - GH: *AU and VK need to check the equations in hcana and SIMC* to

        confirm the differences.  For SIMC, look at event.f

   - also sees that Pmiss and Emiss distributions for MC are narrower than Data

      - *Reconstructed variables (Pmiss, Emiss) in SIMC not calculated in the

        same way as hcana*

      - this affects not only the variable mis-matches, but also the shapes of

        the distributions themselves, as the resolutions can work out better or

        worse depending on how the calculation is done

      - DG fairly certain on this.  He tried looking at hcana code but no

        one-to-one correspondence between the hcana and SIMC equations was

        obvious

      - SK - I agree that this appears to be the case

      - Should be addressed long term

         - Standardise calculation in hcana/SIMC

            - This needs to be on the agenda long term

      - Peter B looked at HeeP and recalculated values himself, since he didn't

        trust that hcana and SIMC calculated them the same way

- 2 week plan

   - Finish report files for Richard

   - Debug some of the HeeP issues

   - Implement some efficiencies

   - Hodoscope calibrations too (different energies)

Vijay Kumar (Slides presented by GH)

-----------

- Data/SIMC comparisons, HeePCoin

   - Old -> Improved

      - Used Jochen's Heepcheck program, 0.13% HMS momentum offset applied

   - Mean quoted on plots, histogram mean?

   - Found bug last week relating to how weight was applied

      - Was applying aeverage weight to all events, NOT weighting each

        individual event

      - Scripts now use weight correctly, distributions now have similar shape

   - Flipped pmz

      - AU Q - Is pmz flipped in the plot or when calculating it?

      - GH - Assume probably just when filling histogram

- 2 week plan

   - Need to do 4.8 GeV and other Heep COIN

   - include Effs

   - should help track pmx,y,z differences between hcana and SIMC

Pete Markowitz

--------------

- Hall C UG wants two talks

   - One on PionLT/KaonLT talk

   - One on the Pion form factor

   - 20+5 talks, Thursday afternoon June 16th

   - Vijay -> KaonLT

   - Junaid -> PionLT

   - Circulate 1st draft of slides by 10th of June

   - Dry run: 14th of June at 15:30 Eastern

Jacob Murphy

------------

- Hodoscope calibrations are at a pretty good point going in to the upcoming

  experiment

   - will start upcoming run with best params from fall/winter run

   - will need to redo calib w/defocused data soon after data taking starts

- EDTM DeadTime calcs

   - wrote up a report which has been circulated around a little bit

      - will make improvements and distribute to whole PionLT/KaonLT group

   - How event type 3 is handled is a bit odd

   - Need to try and make sense of the event types and how they are actually

     determined

   - the issue seems to be when prescale factors are checked by the DAQ

      - event type 3 is BOTH singles

      - the issue is when an event is accepted in both singles triggers at the

        same time, but only one is saved

      - this will happen for every EDTM event, unlikely to happen for physics

        events

   - *event type preference order: 6,5,3,1,2,4*

      - COIN physics events are fine, EDTM goes through COIN trigger

      - but COINs are turned off during Heep singles and Lumi

        in this case one arm will take precedence

      - *need to set EDTM rate for lowest rate arm*

   - DG - Should we try running singles completely on their own? Try and

     disentangle this

   - JR - Would be nice to try to disentangle this further

   - One trigger at a time would double the time it takes to do HeeP singles

     though.

   - Can we switch the singles DAQs?

      - Would need to switch, then switch back to COIN DAQ

      - Reset all timing windows etc each time too, so it's not very practical

   - GH - Are we not ok if we only prescale one arm?

   - JM - Didn't consider EDTM when considering this

      - *Any time you have a PS=0 in SHMS, you will *never* see EDTMs in HMS*  

      - Presentation on all of this info back in February

        https://redmine.jlab.org/attachments/download/1401/PionLT_EDTM_Study2_Analysis.pdf

   - Problem has always been there, but never understood

   - 6 GeV data handled very differently

   - CPULT can still be calculated without too much issue

   - Physics/Coin runs, EDTM value is fine

      - Single arm EDTM LT is the issue

- PionLT summer run plan optimisations discussions

   - *Take another look at 10 GeV run plan, HeepSing and Lumi*, do any of these

      present an issue?

   - Skip some lumi scans and do some as single arm?

   - P > 5 GeV/c in HMS on one lumi scan?

      - Want carbon optics and delta scan for anything with HMS P > 5 GeV/c

      - DG - No LUMI just a white spectrum, shouldn't care

      - but *delta scan needed for every physics setting with HMS P > 5 GeV/c*

   - discussion on sieve runs

     - can do rastered, 1x1 is preferred over 2x2

     - note Run 4819 (KaonLT) used 2x2 and sieve plots look fine

   - Need to focus on decisions wrt 10 GeV asap

   - GH, JM, NH, MJ will discuss again at tomorrow's Run Plan meeting

- 2 week plan

  - finish 10 GeV run plan

  - some EDTM studies w/ event types

    - revisit report on EDTM, make implications clearer

Junaid

------

- Finished lumi scans part of summer run plan

   - Arrived at several settings

   - sent comments on NH, JM plans.  2nd draft posted on RedMine

- Shift Worker instructions circulated for review 

   - Not on Redmine yet

   - JM will post on Redmine

- DC/Cal calibrations

   - path issues fixed, deciding on runs to do

- 2 week plan

   - Detector calibrations

   - Hall A/C Presentation

Nathan

------

- Run plan draft on the Redmine

   - Spreadsheet on there too

- Trying to get the HCG/NGC calibration working

   - Issues running it for Nathan

   - Vijay checked and it ran OK for him

      - Need to be 100% sure the conditions are identical

   - Trying to pull script out of TProof framework

      - Script seems to have open brackets and errors included, is version the

        same as Vijay's?

   - Non TProof version probably best

      - Could just use TChain or just hadd would work ok

Shifts

------

- GH will circulate another reminder for people to sign up

Comment from Tanja

------------------

- Redmine 

   - Would be nice to add an analysis task/timeline to the PionLT redmine

Next Meeting

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15:30 EDT on the 14th of June

- main agenda item will be Vijay and Junaid dry runs