Oct 17/23 PionLT/KaonLT Analysis Meeting Notes
----------------------------------------------
(Notes by GH & AH)
Today: KaonLT will be discussed first
Please remember to post your slides at:
https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
Present
-------
Regina - Garth Huber, Ali Usman, Muhammad Junaid, Nacer Hamdi, Nathan Heinrich,
Vijay Kumar, Alicia Postuma
CUA - Casey Morean, Tanja Horn, Richard Trotta
FIU - Pete Markowitz
Richard
-------
Preparing for LT-sep iterations
- Ratio of Data/MC vs. phi for different t bins for both low/high epsilon looks
more consistent
- set interference terms LT,TT to zero
- sigL had a (t-0.2) type term, removed for now
- the motivation of the (t-0.2) in the Fpi-2 pi-/pi+ analysis was to give a
simple proxy for t'
- the dependence of the Ratios vs t once the iterations start will give
information on what the data will require as far as t-dependent
parameterization is concerned
- Short routine to recompute SIMC weights after an iteration, to avoid having
to re-run SIMC after each iteration
- Still working to improving weight computation
- Garth: use a ratio method to compute the weights, to avoid recompute
Jacobians and other factors needed to go from cross section to weight
New_Weight=Old_Weight*(New_dsigma/Old_dsigma)
- Confirm the usage of CM frame variables, before computing the weights
- will almost certainly need to add variables to SIMC ROOT tree to do the new
weight calculation efficiently
Vijay
-----
HeepCoin comparison after Garth's offsets
- offsets used were determined using only 2.7, 3.6, 4.5 GeV data
- Vijay justified this choice by the fact that this set had P_SHMS offset
equal to zero, which seems more reasonable for these low spectrometer
momenta
- Improved W value after applying offsets corrections obtained from Garth
Next Steps
- looking at Heep cross-sections using existing cryotarget boiling corr
- also looking at Lumi correction script for Summer 2019 data
Garth
-----
More on the HeepCoin offsets
- looked at Vijay's data for other variables: EM, PMX, PMZ, W
- the results seems overall in agreement with predicted quantities
- EM is worst variable in terms of reconstruction, which is disappointing
- overall, observed behavior with offsets is slightly worse than predicted
- Low Q^2 data at low -t<0.01 is sensitive to correct offsets
- Still need to investigate for other energies
- Richard should try GH's offsets determined for 3 highest beam energies
- GH might ask Vijay to rerun using an alternate set of offsets for
comparison, GH needs to do more study first
Nathan
------
No report. Working on PhD committee report and slides
Junaid
------
New parameters for Hodo Vp for 2021 and 2022
- still need to see if gap in distribution at x=0 is there or not after
removing HGC cut
Alicia
------
Had a meeting yesterday to come up with a plan for the CT "leakage" problem in
10.6 GeV data
- will not affect BSA analysis, except that will have to apply Beta cut before
selecting random windows
Ali
---
Just returned from Pakistan. The plan going forward:
- Study Beta cut dependence on data rates and on other variables, to see if the
CT leakage correction is stable, or not
- will start with Heep data, then move to physics
- will calculate separate corrections for pi/K/p, to see if they're equivalent
(within errors)
- will calculate the CT leakage correction in the report files, so it will be
available for all runs in the nxt replay
- Tanja: will the correction determined from only some runs, or all?
- AU: it depends on what the data show. We hope it's not rate dependent, but
we have to check. Maybe the HeepCoin data give the most reliable
correction.
Nacer
-----
Working on selection optimization for KaonLT data @ 3.8 GeV
- copied some output ROOT files from iFarm to local workstation
- Good news: There is no Coin Time vs. Beta tails observed for these data.
- particle ID studies for K+ in progress
Next Meeting
------------
- Tues Oct 24 @ 15:00 Eastern/13:00 Regina/12:00 Pacific
- PionLT will go first
- GH unable to attend, Tanja and Richard will take notes
Poll to select times for Nov-Dec meetings
https://www.when2meet.com/?21823030-iJ3Eh
Most likely time so far is Thursday afternoon near 15:00 Eastern
Join Zoom Meeting
https://uregina-ca.zoom.us/j/94470211297?pwd=djBROEdWUENLUTF3ZFN1c0kvS0VIQT09
Meeting ID: 944 7021 1297
Passcode: 320362