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Jun 19/24 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, Muhammad Junaid, Nathan Heinrich, Vijay Kumar, Zach

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Sullivan

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Ohio  Julie Roche

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FIU  Pete Markowitz

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Virginia  Richard Trotta

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CUA  Tanja Horn

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Junaid

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PionLT Heep Offset Studies

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 tested adding or subtracting momentum and beam energy offsets to resolve sign

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ambiguity in how they should be applied

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 5.98GeV: positive sign offsets work better than negative sign

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 all energies shown, up to 10.54GeV. + works better than  sign

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 compare observed DataMC shifts compared to predicted by GH's program

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 overall, the shifts are closer to predicted by GH's program, sometimes even

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better than predicted (which is allowed since the program is based on the

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mean values only, and not the full distribution)

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 then fixed momentum and beam energy offsets to +sign, and flip sign of

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inplane angle offsets

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 + works better than sign

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 Richard: his momentum offsets were sign, angle offsets were added

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 Richard will discuss this more with Junaid next week

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 Richard: observes that 10.54GeV EM, PMZ distributions too broad compared to

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MC, the lower energy distributions look more similar

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 showed plots from his analysis, originally SIMC was much too narrow in

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comparison to data, wasn't using recon_hcana script. Using the script,

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SIMC dists broadened and looked more similar to data

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 two possibilities to check:

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 does standard.kinematics have correct particle masses for 10.54GeV

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setting?

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 is recon_hcana script using correct particle masses?

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 Richard and Junaid can discuss this more next week too, if needed

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Next Steps:

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 Heep yield ratio study

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 will use Richard's LH2 boiling factors initially

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Zach and Nathan

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PID efficiency studies vs ELREAL rate

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 as a reminder, the normalized yields were not flat w/rate, the purpose of

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this study is to see if this is caused by the PID cuts

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 results shown for HMS efficiencies vs ELREAL, SHMS plots in progress

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 HMS carbon Cherenkov efficiency vs ELREAL rate fairly flat, only goes to

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~20kHz

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 efficiencies very close to what Junaid calculated

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 error bars miscalculated, used Gaussian errors, in process of switching to

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Binomial errors

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 HMS carbon Calorimeter efficiency vs ELREAL rate also flat ~99.8%

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Next Steps:

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 finish SHMS efficiency studies, use Binomial errors

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 assuming this study rules out the PID explanation on the observed rate

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dependence, the next step would be to replay the low current data w/different

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current cut in hcana, that's almost certainly the problem

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Richard

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KaonLT LTseparations, Q2=5.5 setting

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 trying to find a better parameterization that works at this Q2

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 one issue is that the trange is larger than at lower Q2

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 looking to get good starting paramters that work over a broader range of t

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 hoping to have some initial Q2=5.5 results by next week

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 will meet with GH after SoLID meeting on Saturday afternoon to discus more

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Vijay

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Low Q2 PionLT systematics studies

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 radiative flag ON/OFF in SIMC

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 extract new sigL, sigT after 2 iterations and compare to L,T with flag ON

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 calculate deviation in sigL, sigT for each tbin

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 sigT on average more sensitive than sigL, particularly for lower tbins,

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however the deviation in sigT fluctuates and tdependence not entirely

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clear

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 deviation in sigL seems to be more similar between tbins

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 Tanja: would like Vijay to compare plots of data & MC with flag ON/OFF

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 it would also be good to compute deviations in LT, TT

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Next Steps:

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 will vary spectrometer acceptance cuts (xptar, yptar, delta)

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 suggest to do one spectrometer at a time

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 look at the distributions first to determine a sensible variation in the

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cuts, also consult older theses to see what they did

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Next Meeting

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 Next meet: Thur June 27 @ 15:00 Eastern/13:00 Regina

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 KaonLT will go first
