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Mar 13/25 PionLT/KaonLT Analysis Meeting Notes
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----------------------------------------------
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(Notes by GH)
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Today: KaonLT will be discussed first
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Present
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-------
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Regina - Garth Huber, Alicia Postuma, Nathan Heinrich, Muhammad Junaid,
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Ali Usman, Nacer Hamdi, Vijay Kumar
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Ohio - Julie Roche
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CUA - Tanja Horn
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Vijay
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-----
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Update on Q2=0.425 analysis
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- new plots with full statistics replay
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- CoinTime for 3 epsilon settings
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- Diamond Cuts slightly revised from last time
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- t-binning:
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- choose 7 bins, lowest 0.007-0.013, 0.013-0.016, ...
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- range is similar to Q2=0.375
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- about 42k events/bin totaled over 3 epsilons
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- lowest epsilon has 5.6-8.3k per bin
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Richard
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-------
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Can't attend, submits written report
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- checked eps_n_theta.f in calc_xsect.f to be sure correct masses are used
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- this is follow up to inquiry by GH that thetacm seemed very large (up to
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60deg) for higher t-bins
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- so thetacm must really be this big
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- higher Q2 fitting
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- found a better function for sigT,TT which fixes the fits
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- Q2 and W distributions look good now but high t is a bit off
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- ratios also look good, Chi2<3 for all fits, so just trying to figure out
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what's going on with high t
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- Tanja will set up a meeting between RT, PM, GH to discuss strategy for the
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first K+ publication, strong desire to submit something by this fall
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Alicia
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------
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Proton absorption Geant4 simulation
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- fixed problem giving weird electron absorption values
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BSA PLB
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- Haiyan Gao is our editor, paper status says out for review
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u-Channel
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- replaying u-channel data and working on u-channel models in SIMC
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- more detiled report to follow
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Ali
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---
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Thesis submitted to internal committee for final review before going to
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External Examiner
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- next steps:
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- will look again at t-binning, with goal to increase #bins for higher
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statistics settings
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- would also like to do unseparated pi+Delta0/pi+n yield ratio at high
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epsilon, integrated over phi
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- avoid phi binning because of very limited statistics, will need to do
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some systematic checks on phi-modulation integration to zero
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since not fitting TT, LT
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- no diamond cut (hence no L/T-sep) to avoid loss of statistics
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- plan would be for paper to include both BSA and pi+Delta0/pi+n ratio at
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high epsilon, since theory is so uncertain now that BSA data by themselves
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are an insufficient constraint, need an observable linked to yield
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- Tanja suggests to get some theory input on this strategy before
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proceeding, so that we are sure it will have impact
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Nacer
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-----
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KaonLT Q2=0.5 t-binning
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- Lambda: 7 bins, from 0.065<-t<0.165
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- ~15k events per bin at each epsilon
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- Sigma: 7 bins, from 0.095-0.205
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- ~7k events per bin at each epsilon
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- Vijay: since some of the t bins are quite narrow, suggests to confirm the
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t-resolution using SIMC (i.e. t-ti)
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- for his pi+ data, t resolution sigma=0.001697
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- Garth: suggest that both Nacer and Vijay make t-phi plots, to confirm that
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there is full phi coverage at one epsilon over the selected t-range
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Nathan
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------
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Plan is to wrap up PionLT Lumi analysis ASAP
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- LH2 boiling correction looks good
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- will apply this to COIN Lumi data and look for any residual rate dep
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- applying DM ELLT correction in cases where EDTM not applicable
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- aim is to see if there is any residual rate dependence that needs, if small
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an additional systematic error to be assigned, or if large then to be
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corrected
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- will write up a report on the final results, which can be included in thesis
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Junaid
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------
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- pass 3 replay of all PionLT data done and archived
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- finalizing checks before starting LT-separation
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- checking PID and other cuts, preparing dummy and random subtractions
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- Tanja: has cut dependence been studied yet?
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- yes, this was studied already last fall
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- Diamond cuts, t-phi binning to be decided
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Next Meeting
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-------------
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- Thur Mar 20 @ 16:30 Eastern/14:30 Regina
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- PionLT will go first
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- NOTE: meetings start 16:30 Eastern/14:30 Regina from March 13-April 10
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- after that, we can return to 15:30 Eastern for the convenience of our USA
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colleagues
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