## Kaon LT Meetings » mtg_24mar21.txt

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Mar 21/24 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, Nacer Hamdi, Ali Usman, Alicia Postuma, Muhammad Junaid, |

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Nathan Heinrich, Vijay Kumar |

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JLab - Dave Gaskell |

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FIU - Pete Markowitz |

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CSULA - Konrad Aniol |

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CUA - Casey Morean, Tanja Horn |

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Nathan |

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------ |

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PionLT luminosity scan analysis |

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- worked on getting Richard's Lumi script working |

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- shows initial result of first lumi scan in 2021 (Carbon runs 12144-12151) |

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- these runs have a BCM calib from Dave Mack |

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- only 4 of 9 points shown, some plotting bug to fix |

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- SHMS Rate up to 200 kHz, current up to 70uA |

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- the 4 points so far look reasonable, but more work to be done |

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- Dave: what is "Relative Yield Scaler"? |

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- probably is ELREAL scaler, but need to check |

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- will work on single arm Lumi scan after the script is better understood |

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- that scan will require a BCM calibration, will check with Dave Mack |

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Junaid |

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PionLT Heep analysis |

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- no plots to show this week |

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- ran SIMC for all HeepCOIN settings, will do fits for GH offset studies |

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Garth |

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Modifications to SIMC for pion scattering in SHMS collimator |

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- located Fpi-2 HMS collimator routine for implementing in SIMC |

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- Dave: SHMS collimator is 2.5 inches thick |

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- Stephen: docDB report on SHMS collimator: |

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https://hallcweb.jlab.org/doc-private/ShowDocument?docid=1104 |

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Ali |

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piDelta BSA |

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- starting on 3 highest Q2, where no HMS delta-correction is needed |

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- MM shape study |

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- SIDIS and RHO dists so similar, so will just use SIDIS |

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- shows example fit using either just SIDIS or just RHO |

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- SIDIS fits are a bit better than RHO |

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- plots of fitting still in progress |

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- running SIDIS MC for more statistics |

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- Q2=3.0, W=3.14 t-binning |

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- this setting has enough statistics for 2 t-bins |

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- can't use just SHMS center setting to determine binning, need to use L,R,C |

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to get stats over full t-distribution |

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- places a tight cut on piDelta MM region to get approximate statistics for |

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binning without doing a background subtraction |

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- will divide the t-dist at -t=0.425 for the 2 tins |

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- Ideas on Systmatic Error estimate for Delta fitting |

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- Option 1: compare BSA using integration of Delta MC fit to data, to BSA |

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determined from (Data-SIDIS-pi+n fits) |

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- Option 2: compare BSA when varying the pi+n and SIDIS fits |

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- fit pi+ at peak, or at just the tail (an extreme case) |

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- Tanja: exactly what systematic are you trying to determine here? |

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- GH: expecting the uncertainty from the Delta fitting to dominate over the |

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MM cut dependence, since the Delta peak is not clean (unlike pi+n) it is |

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not so obvious that we can disentangle the Delta fitting systematic from |

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the MM integration region systematic |

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- Dave: when fitting pi+n MC, do you fit to the height of the peak, or the |

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integral within some MM region to be less sensitive? |

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- Ali: fits just to the pi+n peak |

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- Dave: try to fit integral within some FWHM (or other region) and get the |

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integrals to agree instead |

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- Tanja: trying a variety of different methods to understand how various |

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effects may be correlated seems the best approach |

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Alicia |

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------ |

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HMS delta-correction in hcana |

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- hcana compilation issues |

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- eventually got it to work after info from Stephen, Ole |

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- editing SpectrometerClass |

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- found that Tanja's old Q3 correction (fSatCorr) is already implemented in |

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code |

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- kept that architecture, but added two new options for P_HMS=5.3, 6.5 |

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- MM vs hsxpfp plots shown for: |

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- P=6.59, Run 4873 |

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- if hsxpfp>0, hsdelta+=3.0 hsxpfp -- LOOKS GOOD |

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- P=5.29 |

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- if hsxpfp<0, hsdelta-=5.0 hsxpfp -- OVERCORRECTS, 4.0 looks better |

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- running batch jobs for replaying these data |

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- have "nearly final" BSA values for other three Q2 settings |

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Dedicated meeting to discuss BSA errors, for April 1 or 2 |

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- please fill out poll at: |

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https://www.when2meet.com/?24252350-iFG7B |

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Vijay |

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Low Q2 PionLT analysis |

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- no plots to show this week |

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- working on Data/MC ratio plots with only Central SHMS setting |

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- encountered unexpected errors, still debugging |

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- last week's plots with all SHMS settings are available on RedMine |

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- in addition, trying to understand MC iteration process |

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Nacer |

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Low Q2 KaonLT PID studies |

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- no plots to show this week |

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- trying to get a good RF cut, other PID cuts are mostly ready |

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- will try to reduce pi+n peak w/o cutting into Lambda/Sigma events |

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- GH: once you decide on an RF cut, you will want to go back and recheck the |

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other PID cuts as it will be a bit easier to distinguish small K+ from big |

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pi+ sample |

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- Nacer: if RF cut works really well, maybe won't need HGC cut, which would |

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simplify other parts of analysis |

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Stephen |

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SHMS NIM paper |

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- thanks to everyone for submitting plots for NIM paper |

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- has all of the needed plots now, will try to implement them soon |

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- will aim to have paper ready for submission to NIM by end of April |

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N*2024 Conference at York, June 14-21 |

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- asked to give a 20 minute talk on meson form factors |

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- will ask for update plots for the presentation |

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- will distribute an abstract soon |

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Next Meeting |

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------------ |

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- Thur Mar 28 @ 15:00 Eastern/13:00 Regina |

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- KaonLT will go first |

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