Nov 15/24 PionLT/KaonLT Analysis Meeting Notes ---------------------------------------------- (Notes by GH) Today: KaonLT will be discussed first Present ------- Regina - Garth Huber, Nathan Heinrich, Alicia Postuma, Ali Usman, Muhammad Junaid, Nacer Hamdi JLab - Dave Gaskell Virginia - Richard Trotta Richard ------- KaonLT function fitting update for LT separation - looking only a Q2=3.0, W=3.14 data - changed t-binning to get more info on t-dependence - for now, 10 bins from 0.2 to 0.4 - after the tests, plan to go to 6-7 bins - *NB* GH: t-range 0.2-0.4 is surprisingly narrow, assumes the experimental acceptance (after diamond cuts) is wider than this, encourages to use the full t-range - trying a new set of functions for TT - TT=(p13+p14*Gaussian)*sin^2(theta) where the centroid and width of the Gaussian are free parameters - this does a better job of fitting the t-dependence above 0.3, but does not have proper form at t-min when p13.neq.zero - nonetheless, gives lowest chi-square of all functions tried to date, due to better fit for higher -t - shows the extracted t-dependence of TT using this function - *NB* GH: maybe a 4th order polynomial would do a similar job and have better form at low -t? Ali --- - making good progress on thesis writing, hoping to give 2nd drafts of chapters to GH soon Alicia ------ - checked APS author portal for status of BSA paper - reports recently received from 2 referees - a 3rd referee was contacted on Nov 6 after these two reports were received - proton absorption MC - hoping to have time to work on this next week Nacer ----- KaonLT Heep singles - offsets were applied incorrectly for singles - offset units issue fixed, but maybe still some ambiguity on correct sign of offset - *NB* will check w/ Junaid on correct implementation in SIMC input file - W comparison between Data and MC - Ali's resolution tuning parameter has been used - cut ranges: 0.81 - DG: very interesting that both Singles and COIN have the same Ratio issue - this greatly reduces the number of possibilities on what is wrong - *NB* one possibility is that the applied boiling correction is too large - applied correction is 8%/100uA from Richard's analysis - see 23-Sept-07 RedMine https://redmine.jlab.org/attachments/2119 https://redmine.jlab.org/attachments/2118 - AU: another possibility is the error in Heep parameterization at higher Q2 - DG: new high precision Heep cross sections from Hall A have just been published, can compare them to SIMC prediction to see if model is off - *NB* Dave will look more into this - Mark's tracking algorithm improvements - Mark sent notes on the new procedure earlier this week - Junaid thinks it will be straightforward to apply the changes, looking into - it Nathan ------ PionLT Lumi studies - plots of LH2 singles Lumi, combined over all settings - results from different settings fall into several categories - HMS: red points suggest anti-boiling - green+black points are consistent with each other and have flat dependence - SHMS: green+black points look reasonably consistent - red points are weird - combined fit (lots of scatter) gives (6.5% +/- 1.1%)/100uA - looking into whether it is justifiable to discard the red points - not good that SHMS and HMS see different dependences for black+green points - Coin Lumi analysis using SIDIS+DEMP settings - some outliers that need investigating - with outliers removed, get two clusters of points: - cyan(SIDIS)+yellow(DEMP) -- less boiling (3-4%) - black(DEMP)+green(DEMP)+red(SIDIS) -- more boiling - blue -- strong anti-boiling - still need to investigate rate-dependence, see what is the reason why two different correlations seen - *NB* DG: should confirm that the target fan speed is the same for all of these settings Junaid ------ - working on PhD committee meeting reports - will implement Mark's tracking algorithm next week Garth ----- - comparing Vijay's Q2=0.38 thesis data to Ackermann Q2=0.35 results - some questions that need to discuss with Vijay when he returns - working on preliminary fit of VGL model to sigL data - outstanding issues: - Vijay was looking at changes to LT,TT parameterizations before he left, trying to get flatter ratios vs phi for higher t-bins - proton absorption correction not yet applied: this will just be a scale factor - systematic uncertainties not yet included in errors Next Meeting ------------- - Thur Nov 21 @ 16:00 Eastern/15:00 Regina - *NOTE* meeting time moved earlier by 30 minutes until early January - PionLT will go first