## Kaon LT Meetings » mtg_23oct17.txt

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Oct 17/23 PionLT/KaonLT Analysis Meeting Notes |
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(Notes by GH & AH) |

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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, Muhammad Junaid, Nacer Hamdi, Nathan Heinrich, |

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Vijay Kumar, Alicia Postuma |

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CUA - Casey Morean, Tanja Horn, Richard Trotta |

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FIU - Pete Markowitz |

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Richard |

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Preparing for LT-sep iterations |

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- Ratio of Data/MC vs. phi for different t bins for both low/high epsilon looks |

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more consistent |

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- set interference terms LT,TT to zero |

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- sigL had a (t-0.2) type term, removed for now |

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- the motivation of the (t-0.2) in the Fpi-2 pi-/pi+ analysis was to give a |

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simple proxy for t' |

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- the dependence of the Ratios vs t once the iterations start will give |

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information on what the data will require as far as t-dependent |

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parameterization is concerned |

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- Short routine to recompute SIMC weights after an iteration, to avoid having |

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to re-run SIMC after each iteration |

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- Still working to improving weight computation |

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- Garth: use a ratio method to compute the weights, to avoid recompute |

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Jacobians and other factors needed to go from cross section to weight |

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New_Weight=Old_Weight*(New_dsigma/Old_dsigma) |

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- Confirm the usage of CM frame variables, before computing the weights |

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- will almost certainly need to add variables to SIMC ROOT tree to do the new |

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weight calculation efficiently |

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Vijay |

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HeepCoin comparison after Garth's offsets |

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- offsets used were determined using only 2.7, 3.6, 4.5 GeV data |

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- Vijay justified this choice by the fact that this set had P_SHMS offset |

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equal to zero, which seems more reasonable for these low spectrometer |

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momenta |

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- Improved W value after applying offsets corrections obtained from Garth |

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Next Steps |

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- looking at Heep cross-sections using existing cryotarget boiling corr |

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- also looking at Lumi correction script for Summer 2019 data |

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Garth |

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More on the HeepCoin offsets |

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- looked at Vijay's data for other variables: EM, PMX, PMZ, W |

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- the results seems overall in agreement with predicted quantities |

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- EM is worst variable in terms of reconstruction, which is disappointing |

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- overall, observed behavior with offsets is slightly worse than predicted |

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- Low Q^2 data at low -t<0.01 is sensitive to correct offsets |

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- Still need to investigate for other energies |

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- Richard should try GH's offsets determined for 3 highest beam energies |

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- GH might ask Vijay to rerun using an alternate set of offsets for |

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comparison, GH needs to do more study first |

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Nathan |

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No report. Working on PhD committee report and slides |

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Junaid |

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New parameters for Hodo Vp for 2021 and 2022 |

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- still need to see if gap in distribution at x=0 is there or not after |

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removing HGC cut |

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Alicia |

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Had a meeting yesterday to come up with a plan for the CT "leakage" problem in |

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10.6 GeV data |

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- will not affect BSA analysis, except that will have to apply Beta cut before |

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selecting random windows |

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Ali |

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Just returned from Pakistan. The plan going forward: |

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- Study Beta cut dependence on data rates and on other variables, to see if the |

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CT leakage correction is stable, or not |

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- will start with Heep data, then move to physics |

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- will calculate separate corrections for pi/K/p, to see if they're equivalent |

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(within errors) |

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- will calculate the CT leakage correction in the report files, so it will be |

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available for all runs in the nxt replay |

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- Tanja: will the correction determined from only some runs, or all? |

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- AU: it depends on what the data show. We hope it's not rate dependent, but |

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we have to check. Maybe the HeepCoin data give the most reliable |

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correction. |

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Nacer |

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Working on selection optimization for KaonLT data @ 3.8 GeV |

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- copied some output ROOT files from iFarm to local workstation |

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- Good news: There is no Coin Time vs. Beta tails observed for these data. |

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- particle ID studies for K+ in progress |

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Next Meeting |

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- Tues Oct 24 @ 15:00 Eastern/13:00 Regina/12:00 Pacific |

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- PionLT will go first |

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- GH unable to attend, Tanja and Richard will take notes |

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Poll to select times for Nov-Dec meetings |

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https://www.when2meet.com/?21823030-iJ3Eh |

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Most likely time so far is Thursday afternoon near 15:00 Eastern |

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Join Zoom Meeting |

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https://uregina-ca.zoom.us/j/94470211297?pwd=djBROEdWUENLUTF3ZFN1c0kvS0VIQT09 |

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Meeting ID: 944 7021 1297 |

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Passcode: 320362 |