Project

General

Profile

Kaon LT Meetings » mtg_24may02.txt

Garth Huber, 05/03/2024 06:53 PM

 
1
                May 2/24 PionLT/KaonLT Analysis Meeting Notes
2
                ---------------------------------------------
3
                                (Notes by GH)
4

    
5
                     Today: PionLT will be discussed first
6

    
7
Please remember to post your slides at:
8
https://redmine.jlab.org/projects/kltexp/wiki/Kaon_LT_Meetings
9

    
10
Present
11
-------
12
Regina - Garth Huber, Nathan Heinrich, Nacer Hamdi, Ali Usman, Muhammad Junaid,
13
   Vijay Kumar, Zach Sullivan
14
CUA - Casey Morean, Tanja Horn
15
JLab - Dave Gaskell
16
CSULA - Konrad Aniol
17
York - Stephen Kay
18
UVa - Richard Trotta
19
FIU - Pete Markowitz
20

    
21
Nathan
22
------
23
BCM calib results for PionLT
24
- Dave Mack impressed with Nathan's fast progress
25
  - DM loked at NH's 2021 results, calculated some numbers to use
26
  - NH looked at 2022 results, calculating his own numbers to show DM
27

    
28
- BCM4A 2021-22 data
29
  - DM, NH get similar calibration constants
30

    
31
- BCM2 looks good, DM & NH numbers almost identical
32
  - NH shows fit of BCM Rate vs Unser Current and Residuals
33
  - Time vs Residual plot uses time of BCM runs themselves, to check for time
34
    dependence in fit residuals
35
  - residuals vs time look pretty stable, which is good news
36

    
37
- the residuals plot that is concerning is BCM4A, 2021 data
38
  - shows a small (2-3 sigma) trend in residual with time
39
  - two BCM calib for runs 12500-12900 very consistent, so also are two BCM
40
    calib for runs 13700-14100, but a noticeable change between these two sets
41
    - no obvious reason why these 2 sets are different, or even where to put a
42
      time break between them
43
  - pushed calib param to HallC_replay
44
    - BCM4A uses error weighted average of these 4 2021 points
45
    - also takes weighted average of 4 2022 points
46
    - obvious break between these two sets is the end of 2021/start of 2022
47
      running
48

    
49
- Conclusion:
50
1) can use BCM2 or BCM4A, they have similar saturation @ high current
51
  - DM adds a quadratic term above 50uA
52
    - DG: Nathan should use the quadratic correction already in hcana, it was
53
      determined with a current source and should be still valid
54
    - Nathan will apply DM's quadratic correction and see if it works
55
  - after this, Nathan will replay all Lumi data
56

    
57
2) Nathan has not calibrated BCM4B
58
  - 2022 gain is very large, saturates at high current, but it might be very
59
    useful for low current LD2 data
60
  - this will be left for a future student looking at LD2 data, we need to be
61
    sure to leave an obvious note so this is not forgotten!
62

    
63
3) BCM4C should not be used at all
64
  - less stable than BCM4A and similar gain
65

    
66
- everything seems sensible so far, we look forward to seeing the Lumi results
67
  after the replay, to confirm the calibration and non-linear correction
68

    
69
Junaid
70
------
71
PionLT Heep OOP offset results
72
- followed Garth's method for KaonLT data
73
- get similar offsets
74
  - phi_HMS=+2.28mr, phi_SHMS=-0.41mr
75

    
76
- error bars seem very small, and this could affect the fitting results
77
  - GH needs to review his notes and let Junaid know what errors to use
78

    
79
- GH gave Junaid a set of in-plane Heep offfsets, not yet implemented
80

    
81
Vijay
82
-----
83
Low Q2 PionLT L/T-separations
84
- changed MM lower cut from 0.93 to 0.91, as per last week's feedback
85
- showed cointime for all 3 epsilon, and diamond cuts
86
- did 15 iterations since last week
87
  - cross sections are stable now, which is good, but there are some anomalies
88
    in the phi-distributions and Data/MC ratios
89
  - most likely, the fitting function needs to be adjusted to get a better fit
90
    - e.g. sigT is just a simple linear dependence in t right now
91
  - Garth and Vijay need to discuss this early next week
92

    
93
Richard
94
-------
95
KaonLT L/T-separations
96
- concentrating now on Q2=3, W=3.14 data, after it's working better will move
97
  next to high stats Q2=2.1 setting, and the lower statistics high Q2 settings
98
  will be last
99

    
100
- tried customizing t-binning a bit more
101
  - observes a significant Q2-shift with t-bin, and this influences the
102
    parameterization
103
  - still using previous equation for t_ave=0.1112+0.0066*log(Q2) used in sigT,
104
    will need to revise this for KaonLT kinematics
105

    
106
- GH thinks that the function for sigT is too complcated, should try a simpler
107
  function, as Vijay has done
108

    
109
- Richard is giving a talk on Meson Structure @ EIC in Nanjing, May 14-17
110
  - 25+10 min talk
111
  - has old slides to use
112
  - needs to circulate a draft soon
113

    
114
Ali
115
---
116
piDelta BSA analysis
117
- looking at MM fits again after fixing recon_hcana to use m_pi instead of m_p
118

    
119
- Q2=5.5 will have one t-bin, -t<1.05, excluding 1.05-1.60 region
120
  - gets reasonable phi coverage now
121
  - varied t-cut and then looked at MM distribution, to see what t-cut to use
122

    
123
  - Center setting: all 8 phi-bins are filled
124
    - shape study fits generally consistent w/shape of data
125
    - data have some fluctuations (statistics?) and the MC smoothly goes
126
      through the trend
127

    
128
  - Right setting: data fill 4 phi-bins, 2 have lower statistics, but MM fit
129
    still does a reasonable job
130

    
131
  - Left setting: data fill the other 4 phi-bins, 2 with low statistics
132
    - fit fails for the 2 low stats phi bins also because MM range is limited
133
    - however, these bins are filled w/center data, so overall will be OK
134

    
135
- will redo shape study for other (Q2,W) kinematics
136

    
137
- Garth: the SIMC resolution tuning was done when recon_hcana had wrong mass
138
  - did you rerun your scripts to check that things are OK?
139
  - yes, checked that MC did not over-estimate tail for any t-phi bin
140

    
141
Nacer
142
-----
143
Low Q2 KaonLT analysis
144
- looked at Lumi scripts written by Richard
145
  - had to do some path tweaks to get them to work in his account
146
  - Richard will point Nacer to special Lumi runs done later by Mark Jones &
147
    Peter Bosted @ 10.6 GeV
148
  - this exercise is mostly for Nacer's overall understanding, next step would
149
    be to look more closely at the Heep data taken with 3.8, 4.9 GeV beam
150

    
151
Hall A/C Summer Workshop discussion
152
-----------------------------------
153
- it seems they are looking for talks about "publication ready" results
154
  - Richard, Vijay, Ali results not yet at this stage, maybe January workshop
155
    would be better
156
  - Alicia has done further BSA work since January update, and plots she shows
157
    should be the same ones as in the paper
158
    - Tanja will reply
159
    - workshop is July 15-16
160

    
161
Next Meeting
162
------------
163
- Thur May 9 @ 15:00 Eastern/13:00 Regina
164
  - KaonLT will go first
165

    
166

    
167
  
168

    
169

    
(420-420/562)