|
1
|
Jun 28/22 PionLT/KaonLT Analysis Meeting Notes
|
|
2
|
----------------------------------------------
|
|
3
|
(Notes by GH and SJDK)
|
|
4
|
|
|
5
|
Please remember to post your slides at:
|
|
6
|
https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
|
|
7
|
|
|
8
|
Present:
|
|
9
|
Regina - Vijay Kumar, Garth Huber, Stephen Kay, Nathan Heinrich,
|
|
10
|
Ali Usman, Love Preet, Muhammad Junaid
|
|
11
|
Ohio - Jacob Murphy
|
|
12
|
CUA - Vladimir Berdnikov, Richard Trotta
|
|
13
|
FIU - Pete Markowitz
|
|
14
|
|
|
15
|
Richard Trotta Updates
|
|
16
|
----------------------
|
|
17
|
- Updated KaonLT redmine task list
|
|
18
|
- All dates are updated, Gantt chart actually works
|
|
19
|
- Can add plots/slides to each task
|
|
20
|
- Issues are linked on the task list
|
|
21
|
- Update/add READMEs and code as needed
|
|
22
|
- *People need to add links to their work*
|
|
23
|
- Add cryo boiling results from Hall A/C meeting (B Henry) as a resource?
|
|
24
|
- How do ours differ/compare?
|
|
25
|
- RT reports that the analysis schedule seems to be mostly holding ok these
|
|
26
|
last few months
|
|
27
|
|
|
28
|
- HGC efficiencies script added to Richard's efficiency script
|
|
29
|
- received code from Vijay and implemented in script
|
|
30
|
- Need to get different cut values/shapes for different mirror
|
|
31
|
configurations/run periods
|
|
32
|
i.e. before and after HGC mirror realignment
|
|
33
|
- presently using hole cut for after alignment only
|
|
34
|
- *Ali will have to optimize the HGC efficiency cut* (for pi+) according to
|
|
35
|
SHMS momentum
|
|
36
|
|
|
37
|
- Hodoscope calibrations
|
|
38
|
- Run 6762 (6.2 GeV) SHMS looks bad. Weird wiggles in beta vs xfp, dp
|
|
39
|
- *Vijay needs to look at this* for his data too
|
|
40
|
|
|
41
|
- LT/Separation software
|
|
42
|
- RT has forked Bill's code on GitHub and has started making edits
|
|
43
|
- Links to files on Loon are broken in notes Bill had on the LT separation
|
|
44
|
scripts
|
|
45
|
- GH subsequently found the files in an old backup of Bill's directory
|
|
46
|
and posted a copy for RT, AU, VK
|
|
47
|
|
|
48
|
- Discussion on Lambda/Sigma fitting (lineshape from SIMC to MM data)
|
|
49
|
- the MM data distribution needs to be fitted with:
|
|
50
|
a) Lambda peak shape from SIMC
|
|
51
|
b) Sigma peak shape from SIMC
|
|
52
|
c) Estimate of pion leakthrough (from pion sample, similar to how Vijay
|
|
53
|
has demonstrated)
|
|
54
|
- Sigma can't be done independently of the Lambda, since some of the Lambda
|
|
55
|
tail overlaps with the Sigma
|
|
56
|
- In best case scenario, the details of the Sigma fit are not overly
|
|
57
|
sensitive to the Lambda fitting, and the two can be decoupled once they're
|
|
58
|
close to the final values
|
|
59
|
- In worst case scenario, both the Lambda and Sigma fits need to be revised
|
|
60
|
each iteration, in a manner similar to how Bill had to handle the huge
|
|
61
|
background underneath the Omega peak
|
|
62
|
|
|
63
|
Ali Usman Updates
|
|
64
|
-----------------
|
|
65
|
- Updates to scripts/files and templates
|
|
66
|
- HMS/SHMS singles cut files
|
|
67
|
- For HeeP singles and Lumi
|
|
68
|
- Aerogel 1.011 has a smaller tray size, all of the others are the same
|
|
69
|
(Richard looked up the aerogel tray sizes)
|
|
70
|
- Only two cut ranges needed
|
|
71
|
- Cuts seem very broad?
|
|
72
|
- 1.011 is actually very small compared
|
|
73
|
-30 to 30 and -40 to 40 roughly
|
|
74
|
- has two versions of the cut files, one for each aerogel cut
|
|
75
|
- Heep singles/SIMC comparo should be good to go
|
|
76
|
|
|
77
|
- EDTM livetime calculations, now included in PionLT online data
|
|
78
|
- Discussion of what PS scale factor is implemented in Ali's code
|
|
79
|
- PS factors in report file are off?
|
|
80
|
- PS values entered in the GUI, not the actual factors - Is this true?
|
|
81
|
- Need to replace factors with other variables
|
|
82
|
- Double check this
|
|
83
|
|
|
84
|
- Missing variable calculations in SIMC
|
|
85
|
- *need to apply same aerogel tray cuts* to data, effs, MC
|
|
86
|
- same will be true for HGC hole cut
|
|
87
|
- what cuts are applied depends on whether selecting pi+ or K+ in analysis
|
|
88
|
|
|
89
|
- Drafting write-up for hodoscope efficiency calculation
|
|
90
|
- This is done in hcana
|
|
91
|
- will circulate a draft next week
|
|
92
|
|
|
93
|
- SIMC input file energy spread
|
|
94
|
- will make changes to data MM calculation to make the equations the same as
|
|
95
|
those used in SIMC, since SIMC result seems better resolution
|
|
96
|
|
|
97
|
Vijay Kumar Updates
|
|
98
|
-------------------
|
|
99
|
- Working on offsets for 4.9 GeV data
|
|
100
|
- added xtar,ytar,xptar,yptar MC/Data comparo plots
|
|
101
|
- can adjust ytar center of target in SIMC input file to get better agreement
|
|
102
|
- yptar overall looks good, but data have tails that SIMC doesn't show
|
|
103
|
|
|
104
|
- With 0.13% offset applied, MMK shifted too far to the left (was on the right)
|
|
105
|
- Momentum offset worked for one Heep setting, but not the Physics
|
|
106
|
- at least the good news is that the real offset is smaller than 0.13%, not
|
|
107
|
larger
|
|
108
|
|
|
109
|
- *Separate momentum offsets should be found* for different energies
|
|
110
|
- Need to look at the summer data too
|
|
111
|
- the idea is to first find out what offsets are needed to optimize each
|
|
112
|
Heep setting, and then we can look if there is a trend, or if they are
|
|
113
|
consistent, before deciding what to do globally
|
|
114
|
- Multiple offsets to play around with, not just momentum
|
|
115
|
- after Heep-coin offsets are found, we can then look at Heep-singles to
|
|
116
|
- confirm the offset is applied to the correct spectrometer
|
|
117
|
- tiny adjustments can be made to physics replay to optimize MC comparo
|
|
118
|
|
|
119
|
Jacob Murphy Updates
|
|
120
|
--------------------
|
|
121
|
- Finished up EDTM study report
|
|
122
|
- Updates and clarifications to EDTM calculation correction values
|
|
123
|
- rewrote the LT formula to put the prescale factors in 1/PSF format, so the
|
|
124
|
formulas work out more nicely
|
|
125
|
- *Event Type 3* can only occur if there are both HMS+SHMS singles and COIN
|
|
126
|
is pre-scaled but not fired for that event, or an EDTM event
|
|
127
|
- maybe the early PionLT data with prescaled COIN can provide a useful
|
|
128
|
check of our understanding?
|
|
129
|
- EDTM pulses can have ALL trigger types, can only separate them out via
|
|
130
|
event handler
|
|
131
|
|
|
132
|
- Very nice graphical guide presentation on events types, explaining how DT
|
|
133
|
works for various event types based on timing and priority (i.e. who blocks
|
|
134
|
whom)
|
|
135
|
|
|
136
|
Nathan Heinrich Updates
|
|
137
|
-----------------------
|
|
138
|
- HGC calibration script nearly done, running a test
|
|
139
|
|
|
140
|
Muhammad Junaid Updates
|
|
141
|
-----------------------
|
|
142
|
- Calorimeter and DC calibrations
|
|
143
|
- Plots from last run period next meeting
|
|
144
|
- Will post sooner
|
|
145
|
- *MJ should help JM with new data calibs*
|
|
146
|
|
|
147
|
Next Meeting
|
|
148
|
------------
|
|
149
|
Tuesday July 12 @ 11:30 Eastern, after RC meeting
|