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Kaon LT Meetings » mtg_24may16.txt

Garth Huber, 05/16/2024 05:36 PM

 
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                May 16/24 PionLT/KaonLT Analysis Meeting Notes
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                ----------------------------------------------
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                                (Notes by GH)
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                     Today: PionLT will be discussed first
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Please remember to post your slides at:
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https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
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Present
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-------
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Regina - Garth Huber, Ali Usman, Nathan Heinrich, Vijay Kumar, Zach Sullivan,
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   Nacer Hamdi, Muhammad Junaid, Alicia Postuma
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York - Stephen Kay
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JLab - Dave Gaskell
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Ohio - Julie Roche
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CUA - Casey Morean
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FIU - Pete Markowitz
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CSULA - Konrad Aniol
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Nathan
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------
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BCM offset for low current runs:
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  SHMS 16738-16746   HMS 16727-16737
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- applied a 30nA offset
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- seems to work better for HMS than SHMS, SHMS looks like it would need a
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  slightly larger offset
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- Runs 12144-12154 have LT that vary widely, for these the HMS is more reliable
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  than SHMS, but the SHMS rate is 10x the HMS rate
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  - based on this Dave prefers to use the offset that works best for HMS
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  - GH is less convinced, since for the 16xxx runs the HMS and SHMS rates are
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    comparable, so GH would prefer to find a compromise offset between HMS and
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    SHMS
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  - in the end, it probably won't make much difference between 30nA and 50nA
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Next steps:
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- For Runs 12181-91 will play a bit more with the offset, will be ~150nA
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- then do a BCM2 quadratic term check
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- calculate uncertainties in I,Q_beam for each run by propagating uncertainties
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  in calib offset in slope with the specific current used in each run
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Junaid
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------
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PionLT Heep offset study
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- beam energy for 7.9 GeV in standard.kinematics was not updated
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  - using an average of two Arc energy measurements
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- shows result of OOP offset fit, needed to apply an estimated systematic
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  uncertainty (0.0014/Pshms) to get the chi-square/dfm near 1
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- Dave: need to use Mark's calculated beam energies at Hall C target, the Arc
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  energy measurement gives an average value in the Arc, corresponding to about
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  the middle of the Arc.  Mark calculates the synchrotron radiation from the
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  center of the Arc to the pivot, you need to subtract this number from the Arc
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  measurement to get the pivot energy value
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  - the difference is negligible for energies < 8 GeV, but grows quickly with
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    energy above this, particularly for 10-11 GeV beam
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  - Mark's table is at: 
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    https://hallcweb.jlab.org/wiki/index.php/Table_of_12_GeV_Beam_Energy_Measurements
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- updated report template files and BCM2 for current
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Next steps:
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- moving on to HMS Cer, Cal electron efficiencies
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- waiting on GH to redo in-plane offsets
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Vijay
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-----
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- no report, working on last parts of thesis
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Alicia
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------
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BSA analysis
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- in contact w/ B-G Yu re. Regge model calcs
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  - specifically looking for theory calc for our bin-by-bin kinematics
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- hoping to distribute a draft manuscript to this group next week
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Ali
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---
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piDelta analysis
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- finished Q2=3, W=2.32 shape study and extracted BSA
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- two settings left, Q2=3, W=3.14 and Q2=2.1
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  - hoping to have results in 1-2 weeks
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- also working on parts of thesis
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Nacer
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-----
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Low Q2 KaonLT
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- setting up SIMC for first time
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- had to do some tweaks to get ROOT conversion program to work
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- recon script updates, these are experiment specific, not part of SIMC package
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- Dave's code changes for ALMA9 OS change
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Next steps:
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- need to apply beam energy, angle and momentum offsets and check that they're
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  implemented corectly
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- then move to Heep yields and Data/MC ratios
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Stephen
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-------
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Discussion about pending change of iFarm to ALMA9 OS
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- a lot of hcana stuff is based on older version of ROOT
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- a good option would be to keep an older copy of ROOT on group disk
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  - also need to confirm which version of Python is needed
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- a good path forward would seem to take the Hall C RH7 container and get
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  things set up in there
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- people can ssh to ifarm9 (ALMA9 interactive node) now to check what breaks
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- Stephen, Nathan, Junaid and Nacer will work together on this and report back
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  to group next week
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