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June 20/25 PionLT/KaonLT Analysis Meeting Notes
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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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Regina - Garth Huber, Alicia Postuma, Ivan Zhenchuk, Nathan Heinrich,
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Muhammand Junaid, Nacer Hamdi
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York - Stephen Kay
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CUA - Tanja Horn
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Ohio - Julie Roche
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FIU - Pete Markowitz
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Nathan
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------
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Met with Dave last week about the deadtime investigation
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- Nathan will double check at what step TCOIN.param files are called by hcana,
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to confirm that they are read in correctly, working on this now
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- Nathan will also verify that cuts in PARAM file are working correctly
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- right now, the cuts are producing weird offsets in some bars
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- will be busy with JLUO BOD work this week, so tasks will largely wait until
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Nathan returns to Regina
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Junaid
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------
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Q2=3.85, W=2.62 LT-sep
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- shows un-iterated sig_unsep with Garth's Rosenbluth fit
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- made own script to do the fit and confirming that get the same results as
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Garth
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- setting up for iterations, will start with Tanja's Fpi-2 parameterization and
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her final parameters
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Nacer
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-----
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Q2=0.50 K+ LT-sep
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- shows un-iterated sig_unsep with Garth's Rosenbluth fit
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- made own script to do the fit, but so far it only uses 1 epsilon data
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- Tanja: it's not possible to extract sigL using only 1 epsilon, you have to
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do a simultaneous fit of all (2eps)*(15phi)=30 data points to extract
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L,T,LT,TT
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Ivan
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----
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Q2=0.50 BSA
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- selecting pi+ and K+ using a common set of RF cut limits, but selecting
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different peaks for each one
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- for K+, does a pi+ leakthrough subtraction, normalizing to the pi+n peak
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- the normalization factor is nearly constant per bin
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- do not understand why, but the pi+n peak is slightly different width
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between K+ sample and leakthrough subtraction sample, this means the
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subtracted region is negative on the sides
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- pi+n normaliation needs some adjustment, want the subtracted pi+n region to
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integrate to zero
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- *NB* Ivan should meet with Nacer to confirm whether his replay shows the
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same pi+n width difference
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- K+ BSA nearly zero within errors
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- full fit clearly overfits the data, should try simple fit only
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- pi+ BSA slightly nonzero, errors of course smaller
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- K+ t-binning
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- tried 3 t-bins, ~20k events/bin for center SHMS setting only
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- Alicia had ~10k events/bin, but the beam polarization for her data was much
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higher, for these data the beam_pol is ~38% so errors are magnified by 2.5x
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- this binning shows the K+ BSA has a small t-dep, slighly more significant
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deviation from zero for highest t-bin
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- pi+ t-binning
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- 3 t-bins
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- t range is different than K+, Alicia suggests to try comparable t'=t-tmin
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- limits
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Alicia
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------
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- wrote PLB regarding slow response from them
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- apparently 2 referees did not respond after repeated reminders, so Haiyan
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Gao has now started all over with new referees, unfortunately this means
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the last 2.5 months have been wasted
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- she says that part of the problem is that most potential referees are
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authors on the paper
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Next Meeting
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-------------
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- Thur June 26 @ 15:30 Eastern/13:30 Regina
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- KaonLT will go first
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