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May 9/24 PionLT/KaonLT Analysis Meeting Notes

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(Notes by GH)

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Today: KaonLT 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, Ali Usman, Alicia Postuma, Muhammad Junaid,

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Nathan Heinrich, Vijay Kumar, Zach Sullivan, Nacer Hamdi

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JLab  Dave Gaskell

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York  Stephen Kay

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FIU  Pete Markowitz

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CUA  Tanja Horn, Casey Morean

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CSULA  Konrad Aniol

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Vijay

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Low Q2 PionLT LTseparations

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 changed functional form: sigT=A+B(ft_av) where ft_av=t/(abs(t)+0.139570^2)^2

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 still using sigL=A*exp(Ct)

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 shows results of new iterations:

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 phi distributions at high, med, low epsilon

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 sigT,L,LT,TT versus t

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Alicia

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Update on pi+n BSA paper

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 runs through summary of draft paper on OverLeaf

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 asks a few questions on technical details for paper

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Tanja

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High Q2 KaonLT LTseparations, shows a few new plots on behalf of Richard

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 now including data from Left,Right,Center settings at Q2=3, W=3.14

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 lower tbins have better fit to phi distributions now

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 plot of sigL vs t show evidence of K+ pole, which is great

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 sigT is flat, and fairly small magnitude, sigT<sigL for lowest t bins

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 probably due to large W

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 GH: *some sigT errors look small*, particularly in comparison to sigL, should

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be checked

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 now starting to look at Q2=2, W=2.92 data

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 draft slides for Richard's China talk on EIC meson structure simulations will

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hopefully be distributed soon

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Ali

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piDelta BSA

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 Q2=5.5, W=3.02

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 as before, large t region (1.051.60) is excluded

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 MM fit for 8 tbins

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 Center: 8 bins, Right: 4 bins, Left: fit done for 2 bins, other 2 bins

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have low stats and narrower MM range, making piDelta fit unreliable

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 first showing of BSA vs phi for these data

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 Bkd subtracted Data (DataSIDISpi+n_tail) is integrated from 1.111.4

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 in systematic study, piDelta MC will be integrated as well

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 will make a plot of Bkd subtracted Data to compare to piDelta MC peak

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shape

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 compare BSA to pi+n for 0.40.8 trange, both have magnitudes ~0.1, and

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same sign

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 Q2=4.4, W=2.74

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 exclude large tregion: 1.001.60

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 Center: 8 phibins, pretty good fits

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 Right: fit 4 phibins, very low stats in other phibins

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 Left: can fit all 4 phibins (unlike Q2=5.5)

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 BSA vs phi has magnitude ~0.15, also similar to pi+n for similar trange

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 Alicia can do a rebinned pi+n BSA for identical trange to piDelta to make

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the comparison more valid

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 work in progress for remaining 3 settings

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 preliminary shape study shown for Q2=3.0, W=2.32

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 exclude large t 0.901.60

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 Right: 8 phibins

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 Center: only 6 phibins populated

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 Left: 4 phibins

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Garth

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SIMC mods for pion rescattering in SHMS/HMS Collimator

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 to enable, use the following flags at the end of your input file:

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using_HMScoll = 0 ; pion scattering in HMS collimator

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using_SHMScoll = 1 ; pion scattering in SHMS collimator

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 0=rescattering OFF 1=rescattering ON

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 Dave has accepted GH's changes, now in main branch of SIMC

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 confirmed that the effect is small, at least for SHMS

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 GH shows MM comparison plots for two PionLT settings:

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Q2=5.0, W=2.95, eps=0.38, SHMS=center, p_SHMS=6718.9

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Q2=3.85, W=2.02, eps=0.58, SHMS=center, p_SHMS=3493.1

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 only a slight broadening of the MM distribution is seen, slightly more

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for p_SHMS=3.5GeV/c compared to 6.7GeV/c

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 Dave mentions that iFarm is transitioning to ALMA9

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 present version of SIMC will not work on ALMA9, due to changes in gFortran

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specifications for special structures

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 changes are ready to go, needs to push

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 for now, please be sure you select RH7 nodes

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 RH7 going away completely by end of June

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 longer term, Dave will consider to replace the structures with a more

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conventional storage approach, to avoid the compatibility issue

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Nacer

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Low Q2 KaonLT analysis

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 downloaded SIMC today and starting to set up for Heep simulations

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 found Lumi cryotarget boiling and CAL/Cer Effs with help of Ali

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Nathan

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PionLT Lumi studies

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 after updating the BCM calibs, look again at the rate dependence studies

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 runs 1673816746 1 armatatime data

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 TLT looks sensible (95100%)

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 rate dependences generally mild, so optimistic that the studies will go

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well

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 clear evidence that the BCM offsets NH determined earlier will need to be

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revised, most likely a bit smaller, which is good

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 3/4 Trig rate dependent efficiency will need to be added for Scaler analysis

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 some discussion with Dave on not needing to apply this in event analysis,

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as PID cuts clean things up

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 getting Zach a JLab computer account, he will need to do some training first

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Junaid

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 returned late last night from JLab, found the trip to be very useful

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 had a detailed meeting w/Richard on analysis code

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PionLT Heep offsets

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 will add a systematic error to fit for OOP offset, as GH did for KaonLT

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 working on replaying data with inplane offsets determined by GH

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Stephen

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SHMS NIM paper updates

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 draft is nearly ready, hoping to be done in time for Quarterly analysis

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meeting in June

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 a few more plots needed on performance of aerogel & tracking

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 Nathan and Junaid will follow up

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 some useful plots on NGC performance might be found in Abishek's thesi

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Next Meeting

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 Thur May 16 @ 15:00 Eastern/13:00 Regina

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 PionLT will go first

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