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Kaon LT Meetings » mtg_23jan26.txt

Garth Huber, 01/30/2023 05:17 PM

 
1
Stephen Kay
2
Stephen Wood
3
Dave Gaskell
4
Konrad Aniol
5
Jacob Murphy
6
Ali Usman
7
Alicia Postuma
8
Nathan Heinrich
9
Richard Trotta
10
Love Preet
11
Vijay Kumar
12
Erika Gwin
13

    
14
PionLT First Today
15

    
16
Jacob Updates
17

    
18
- Journal clubs resumed at Ohio
19
	- Presented first, had to work on condensing 15 pages of theory paper into a coherent talk
20
- HMS optics page on wiki updated, looks nicer than Stephen's summary one
21
	- Stephen will send on location to move these to
22
	- Probably best to divide this into HMS/SHMS optics pages
23
	- Add columns/comment on data location and when it was taken - KaonLT Autumn 18 /mss/hallc/spring17/raw and so on
24
- Dave G reiterates that data beyond +-8 in delta for the HMS is hopeless
25
- Jacob - Need to exclude it from trying to do the matrix element fit, will ruin fit in regions we actually care about
26

    
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Nathan Updates
28

    
29
- Reference time cuts updates
30
- HMS 3/4 trigger, concern last time that this could cause issues
31
	- Shouldn't affect things, comes in after
32
- Confirmed detector variables that should be used for coin with Carlos
33
- Carlos had script to set detector time cuts
34
- hTref1 and 2 give trig and hodo tdc ref times
35
- DCREF 1-5 for HMS and 1-8 for SHMS give the DC adc ref times
36
- Jacob Q - Will any change update anything in std.kin?
37
	A - No, will change std.database a lot
38
- Plot on slide 3 is both coincidences and singles at the same time
39
- Dave G - Could set up cuts for coin/singles specifically, 2 sets
40
- hT1/hT2 shifted by ~1 bin, just set based on hT1
41
	- Cut is loose anyway
42
- hDCREF3 furthest to the left, use this for cuts
43
- Slide 24 - Cuts for HMS
44
	- Jacob, would be nice to see where these cuts are visually
45
	- Nathan, yes would be illustrative, will make plots and add to slides
46
- 3/4 and elREAL coming in at difference times in the SHMS
47
- Slide 43 - Suggested SHMS cuts, tw osets, elREAL and 3/4
48
- Next step is to look at detector time cuts
49
- Carlos' code, impression is that it checks detector times based upon existing cuts and flags up if there are discrepancies
50
	- Dave G emphasies the importance of also checking this too, look at each of the plots
51
	- Hopefully code does this
52

    
53
Richard Updates
54

    
55
- SIMC part of Bill's LTSep code
56
- Richard outlines layout and steps of LT analysis
57
- See slides for details
58
- In Analysed_Prod.py, some naming conventions different in COIN_DATA_Header
59
- Q2, SIMC data had to be scaled a lot
60
	- Was this a unit error?
61
	- SIMC always uses mC
62
	- Dave Q - What model is being used?
63
		- A - Using whatever is already in there at the minute
64
	- Dave - Whatever is there at the minute, it's using something that was there when he was a grad student
65
- SHMS right setting for Q2 = 5.5 looks bad, lots of pions there, events at -ve -t (!)
66
- Total efficiency for low epsilon values seems very low ( ~45%)
67
	- Need to debug this
68
	- Look directly at the relevant report file
69
- Finalising offsets, Dave and Richard meeting next week
70
	- Need to make sure SIMC variables match up
71

    
72
Ali Updates
73

    
74
- Presented some efficiencies work in the analysis meeting
75
- Should have calorimeter efficiencies ready by next meeting
76
- SJDK - HGC is also to do
77
	- Dave G - Yes will be hard. Also very hard to get a clean pion sample without the HGC
78
		- Shuo tried to do HGC free analysis, never got an accurate estimate kaon contamination
79
	- May be saved by the exclusive nature of our reaction
80
- Dave G - Will want to do systematic checks on cutting/not cutting on the hole
81

    
82
Vijay Updates
83

    
84
- Testing analysis code on PionLT 2019 data
85
- Some errors, fixed some, still some to go
86
- Checking coin time cut for pion selection
87
	- Will check other PID cuts
88
	- Iterate on PID 
89
- Python script did work on a single run
90
- Richard - Error most likely that a run is missing from the efficiency list
91

    
92
Alicia Updates
93

    
94
- Will present some plots/work next week
95
- Run asymmetries for another Q2 setting
96
- Got aluminium asymmetry
97
	- See non-zero asymmetry here
98
	- Root will fit a non-zero asymmetry to it...
99
- Stephen Wood - Could just assume asymmetry is 0, with some error on it
100
	- Propagate error through
101
	- Get a smooth background
102
- Can separate events by helicty, can't separate charge by helicity
103
	- Didn't have helicity gated scalers during KaonLT run
104
- Work on assumption that charge assumption is negligible even if there is one there
105
	- Could add a constant + ASinPhi, if non zero, have a charge asymmetry
106

    
107
- Next week -> KaonLT -> Alicia Asymmetries -> PionLT (?)
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