## Kaon LT Meetings » mtg_23oct10.txt

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Oct 10/23 PionLT/KaonLT Analysis Meeting Notes |
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(Notes by GH & AH) |

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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 - Muhammad Junaid, Garth huber, Nathan Heinrich, Nacer Hamdi, Vijay |

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Kumar |

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CUA - Richard Trotta, Tanja Horn |

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FIU - Pete Markowitz |

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JLab - Dave Gaskell |

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Nathan |

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- No new results to show, busy on Commitee report & TA |

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- Helped setup the software for Junaid for Hodoscope calibrations |

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Junaid |

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------ |

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Hodoscope v_prop calib for 2022 Run Period |

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- plot of delta(x) vs beta(y) |

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- run 14996, start of Summer 2022 beam |

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- HMS: significant improvement |

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- SHMS_ a peculiar gap noticed on the plots near delta=0, |

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- need to investigate without HGC cut to make sure problem isn't with hodo |

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- Run 16558, later in Summer 2022 beam period |

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- compare 14996 calib (before) with new calib (after) |

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- only minor improvement seen compared to 14996 calib |

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- DG says these small differences are acceptable, can use only one calib for |

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2022 data |

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Next steps |

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- will do same for 2021, compare 14996 calib to a new one |

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- probably will use separate calibs for 2021, 2022, but not sure yet |

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- after this, then go back to recheck DC calibs |

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Vijay |

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- replaying Heep coin data with new offsets to be sure they are implemented |

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correctly |

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- GH will send Vijay expected residuals with these offsets, for comparison |

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with replay result |

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Next steps |

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- will start Lumi study after Heep offsets finalized |

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Richard |

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Spoke w/IT about iFarm problems |

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- sounds like it's caused by huge Hall B jobs, won't reset iFarm until Oct 17 |

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CoinTime leakage issue in 10.6GeV data |

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- plot of SHMS Beta vs. Coin time for Q2=2.1, high epsilon data |

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- shows the peculiar two tails due to bad coin time |

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- after PID cut the two tails are mostly reduced for kaons |

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- Dave: Need to estimate the correction from pion data, then included for kaon |

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data. The reason why it's not as evident in K+ data is due to lower |

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statistics. |

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- need determine a beta-cut efficiency to apply to data |

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- one possibility: |

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- apply MM cut to select pi+n but w/o beta or CT cuts (denominator) |

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- then apply beta cut in addition (numerator) |

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- GH will set up a meeting with Ali & Richard next Monday to discuss the |

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determination of the correction and its implementation |

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Starting model parameters for LT-separation |

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- found a simple equation for t_average (tav) in formulas |

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- GH: it sigLT, sigTT are too large, just set starting parameters to zero |

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- GH: for sigL, sigT, all you want to do is to find an initial set which does |

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not have crazy behavior (such as negative weights), when the iterations are |

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working they will converge fairly quickly to more accurate values |

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- suggest to sit down with a calculator and find some initial values that are |

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not crazy |

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Garth |

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Computed in-plane offsets for the lower energy KaonLT data |

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- Investigated the adequate number of data points to be used to extract the |

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offsets: |

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- Low Q2 summer 2019 (3 energies) |

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- Lowest 5 energies |

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- KaonLT 5 beam energies |

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- all 8 beam energies |

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- noticed some higher/lower offsets between the different sets |

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- Tanja: dpe, dthp seem driven by lowest energy data |

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- GH wants to generate some offsets for only the higher beam energies |

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- Dave: would be interesting to exclude data for HMS above 5 GeV/c momentum, |

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to avoid HMS saturation issues |

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Next Meeting |

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- Tues Oct 17 @ 15:00 Eastern/13:00 Regina/12:00 Pacific |

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- KaonLT will go first |

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- GH will distribute a poll soon to select times for Nov-Dec meetings |

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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 |

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