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1
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Stephen Kay
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2
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Stephen Wood
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3
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Dave Gaskell
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4
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Konrad Aniol
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5
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Jacob Murphy
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6
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Ali Usman
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7
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Alicia Postuma
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8
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Nathan Heinrich
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9
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Richard Trotta
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10
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Love Preet
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11
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Vijay Kumar
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12
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Erika Gwin
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13
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14
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PionLT First Today
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15
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16
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Jacob Updates
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17
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18
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- Journal clubs resumed at Ohio
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19
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- Presented first, had to work on condensing 15 pages of theory paper into a coherent talk
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20
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- HMS optics page on wiki updated, looks nicer than Stephen's summary one
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21
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- Stephen will send on location to move these to
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22
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- Probably best to divide this into HMS/SHMS optics pages
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23
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- Add columns/comment on data location and when it was taken - KaonLT Autumn 18 /mss/hallc/spring17/raw and so on
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24
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- Dave G reiterates that data beyond +-8 in delta for the HMS is hopeless
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25
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- Jacob - Need to exclude it from trying to do the matrix element fit, will ruin fit in regions we actually care about
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26
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27
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Nathan Updates
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28
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29
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- Reference time cuts updates
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30
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- HMS 3/4 trigger, concern last time that this could cause issues
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31
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- Shouldn't affect things, comes in after
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32
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- Confirmed detector variables that should be used for coin with Carlos
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33
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- Carlos had script to set detector time cuts
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34
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- hTref1 and 2 give trig and hodo tdc ref times
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35
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- DCREF 1-5 for HMS and 1-8 for SHMS give the DC adc ref times
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36
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- Jacob Q - Will any change update anything in std.kin?
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37
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A - No, will change std.database a lot
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38
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- Plot on slide 3 is both coincidences and singles at the same time
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39
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- Dave G - Could set up cuts for coin/singles specifically, 2 sets
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40
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- hT1/hT2 shifted by ~1 bin, just set based on hT1
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41
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- Cut is loose anyway
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42
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- hDCREF3 furthest to the left, use this for cuts
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43
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- Slide 24 - Cuts for HMS
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44
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- Jacob, would be nice to see where these cuts are visually
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45
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- Nathan, yes would be illustrative, will make plots and add to slides
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46
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- 3/4 and elREAL coming in at difference times in the SHMS
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47
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- Slide 43 - Suggested SHMS cuts, tw osets, elREAL and 3/4
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48
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- Next step is to look at detector time cuts
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49
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- Carlos' code, impression is that it checks detector times based upon existing cuts and flags up if there are discrepancies
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50
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- Dave G emphasies the importance of also checking this too, look at each of the plots
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51
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- Hopefully code does this
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52
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53
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Richard Updates
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54
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55
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- SIMC part of Bill's LTSep code
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56
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- Richard outlines layout and steps of LT analysis
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57
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- See slides for details
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58
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- In Analysed_Prod.py, some naming conventions different in COIN_DATA_Header
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59
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- Q2, SIMC data had to be scaled a lot
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60
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- Was this a unit error?
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61
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- SIMC always uses mC
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62
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- Dave Q - What model is being used?
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63
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- A - Using whatever is already in there at the minute
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64
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- Dave - Whatever is there at the minute, it's using something that was there when he was a grad student
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65
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- SHMS right setting for Q2 = 5.5 looks bad, lots of pions there, events at -ve -t (!)
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66
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- Total efficiency for low epsilon values seems very low ( ~45%)
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67
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- Need to debug this
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68
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- Look directly at the relevant report file
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69
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- Finalising offsets, Dave and Richard meeting next week
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70
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- Need to make sure SIMC variables match up
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71
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72
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Ali Updates
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73
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74
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- Presented some efficiencies work in the analysis meeting
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75
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- Should have calorimeter efficiencies ready by next meeting
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76
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- SJDK - HGC is also to do
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77
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- Dave G - Yes will be hard. Also very hard to get a clean pion sample without the HGC
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78
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- Shuo tried to do HGC free analysis, never got an accurate estimate kaon contamination
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79
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- May be saved by the exclusive nature of our reaction
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80
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- Dave G - Will want to do systematic checks on cutting/not cutting on the hole
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81
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82
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Vijay Updates
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83
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84
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- Testing analysis code on PionLT 2019 data
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85
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- Some errors, fixed some, still some to go
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86
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- Checking coin time cut for pion selection
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87
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- Will check other PID cuts
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88
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- Iterate on PID
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89
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- Python script did work on a single run
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90
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- Richard - Error most likely that a run is missing from the efficiency list
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91
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92
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Alicia Updates
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93
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94
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- Will present some plots/work next week
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95
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- Run asymmetries for another Q2 setting
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96
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- Got aluminium asymmetry
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97
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- See non-zero asymmetry here
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98
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- Root will fit a non-zero asymmetry to it...
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99
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- Stephen Wood - Could just assume asymmetry is 0, with some error on it
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100
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- Propagate error through
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101
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- Get a smooth background
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102
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- Can separate events by helicty, can't separate charge by helicity
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103
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- Didn't have helicity gated scalers during KaonLT run
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104
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- Work on assumption that charge assumption is negligible even if there is one there
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105
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- Could add a constant + ASinPhi, if non zero, have a charge asymmetry
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106
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107
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- Next week -> KaonLT -> Alicia Asymmetries -> PionLT (?)
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