Apr 6/23 PionLT/KaonLT Analysis Meeting Notes --------------------------------------------- (Notes by GH and SJDK) Today: PionLT will be discussed first Please remember to post your slides at: https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings Present ------- Regina - Stephen Kay, Garth Huber, Muhammad Junaid, Ali Usman, Alicia Postuma, Nathan Heinrich, Vijay Kumar, Love Preet CUA - Richard Trotta, Tanja Horn Ohio - Julie Roche FIU - Pete Markowitz Junaid Updates -------------- - Working on DC calib, busy with assignments Richard Updates --------------- PID for the right SHMS setting - Doing proton analysis from pion cuts - Subtract from MM for kaon - Will do same thing with pion background - Hopefully huge peak in right setting will make more sense - will do for settings where there is large background, primarily Q22=5.5, 2.1 - haven't looked yet at Q2=4.0, 3.0 Lumi analysis - still have to discuss some issues with Carlos, so this is still a work in progress - 10.6 GeV scan #1 - SHMS 6.842, SHMS Theta 6.495, HMS -3.266, HMS Theta 12.530 - Relative track yield only shown - Carbon Runs 5154-5298 looks pretty good, quite flat - Hydrogen Runs 5150-5166 looks like it potentially has a slight bit of anti-boiling, ~1.5% @ 70uA - Lumi scan #2 - Carbon 5178-5181 looks flat - Hydrogen looks like it's anti-boiling, ~3% @ 500kHz (ELREAL) - Effect seems to take off > 250kHz - Lumi scan #3 - One Peter/Mark took, SHMS -6.2 - Carbon 5351-5358 slight decine, but errors large - LH2 5342-5350 HMS strong boiling, ~6% @ 25uA, still investigating - Bad TLTs for this setting - Some had runs times < 1 minute - Some odd cut going on? - Other than setting #3, things look pretty good overall - LHS 5342-5350 Track SHMS - two outliers, otherwise fine, same issue with LT - 8.2 GeV Lumi Run #1 - SHMS -5.745, HMS -5.745 - HMS carbon looks ok, quite flat - HMS hydrogen looks ok, some boiling, ~4% at 50uA - SHMS carbon 7948-7951 - anti boiling @ 250kHz (ELREAL) - SHMS LH2 7954-7960 - 2% boiling @ 50uA - Overall lumi looks pretty good - Lumi studies can nearly be wrapped up - GH: plan for this? - RT: Give definitive reasons for each of the effects seen, and rejecting - bad runs - Look at HMS/SHMS across all settings, get a definitive boiling correction - HMS should give more reliable boiling result, since lower rates, but SHMS should be consistent with it once rate dependence effects are removed - GH: Rate dependence from physics data? i.e. the settings where we took data at different currents for same setting, a Lumi scan with Physics data - since there seems to be limited good Lumi data to confirm rate-dependent effects, we need to use the Physics Lumi study to confirm rate dependences and find overall rate correction - TH: agrees, it looks like there is a residual rate dependence that is not yet understood - No carbon boiling, but something else we don't understand - March/April 2019 data, had some where we varied the current across a setting - Ali will dig out the runs - AU: "8038-8085 This is largest rate variance in SHMS. There S1X goes upto 2.5 MHz" - GH: Vijay, plot on left with increasing SHMS rate is important, if this is real, need to correct for it in Summer 2019 pion data too - it would be really helpful to compare Mar/Apr KaonLT and Summer-2019 rate dependence analyses to see if they're consistent - any significant difference might indicate a systematic uncertainty Ali Updates ----------- Ali has done preliminary Delta-pi PID - Will show plots next week Alicia Updates -------------- - No updates, homework/classwork Vijay Updates ------------- Working on LT-sep plotting scripts - data/SIMC comparison plots - Working on comparison between phi/t bins - some things don't make sense yet, will show some plots soon Stephen Updates --------------- Hall C Quarterly Analysis Meeting - Carlos Lumi studies - Richard update on SIMC kinematic variable scripts - David Hamilton on NPS software changes - maybe Peter Bosted can discuss some of his findings? Brief run through of GHP talk - EIC/JLab22 Pion Structure prospects - Tanja notes: - It's pion structure functions with exclusive reactions, no? -> Update slide 1 title - One thing to be careful with is the statement "cannot do L/T separations" since one can do it if one has a good angular coverage as shown by data analysis from Hall B. Saying "traditional L/T is problematic" seems fine. - Depends who's in your audience :-) - JLab 22 GeV is very useful even if there is an EIC - one can motivate that it provides a window between JLab 12 and EIC - https://arxiv.org/abs/2103.00611# - CLAS Pi0 LT separation measurement Nathan Updates -------------- Quick GHP slide updates - Tanja: Add this expt too - E12-13-010 - https://misportal.jlab.org/mis/physics/experiments/viewProposal.cfm?paperId=797 - Tanja: NSF grant # NSF PHY 2012430 Next Meeting ------------ - Thur Apr 13 @ 16:00 Eastern/14:00 Regina/13:00 Pacific - KaonLT will go first - will be missing some people because of GHP