|
1
|
June 5/25 PionLT/KaonLT Analysis Meeting Notes
|
|
2
|
----------------------------------------------
|
|
3
|
(Notes by GH)
|
|
4
|
|
|
5
|
Today: KaonLT 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, Ivan Zhenchuk, Muhammad Junaid,
|
|
13
|
Ali Usman, Nacer Hamdi, Vijay Kumar
|
|
14
|
CSULA - Konrad Aniol
|
|
15
|
Virginia - Richard Trotta
|
|
16
|
JLab - Dave Gaskell
|
|
17
|
JMU - Ioana Niculescu
|
|
18
|
Ohio - Julie Roche
|
|
19
|
York - Stephen Kay
|
|
20
|
FIU - Pete Markowitz
|
|
21
|
CUA - Tanja Horn
|
|
22
|
|
|
23
|
Ali
|
|
24
|
---
|
|
25
|
piDelta BSA new rebinned results
|
|
26
|
- 3 t-bins for Q2=3.0, W=3.14 and Q2=2.1
|
|
27
|
- 2 t-bins for Q2=3.0, W=2.32
|
|
28
|
- 1 t-bin for Q2=4.4, 5.5
|
|
29
|
|
|
30
|
Pete: the A_LU phi distributions look like they have little scatter about the
|
|
31
|
fit sine curve, which implies the error bars are over-estimated, can you plot
|
|
32
|
the difference between the A_LU values and the fit curve, so we can more
|
|
33
|
clearly see the fluctuations?
|
|
34
|
- Dave: an alternate suggestion would be to list the chi-squared/dof for each
|
|
35
|
plot so we can see if it's too good or not
|
|
36
|
|
|
37
|
Next steps:
|
|
38
|
- will work on systematic uncertainties
|
|
39
|
- MM fit-dependence uncertainty
|
|
40
|
- PID cut dependence uncertainty
|
|
41
|
- beam polarization error (a constant value)
|
|
42
|
|
|
43
|
- some discussion came up in thesis defense on ways to reduce the
|
|
44
|
fit-dependence uncertainty, Ali will investigate and get back to GH and Dave
|
|
45
|
on it
|
|
46
|
|
|
47
|
Vijay
|
|
48
|
-----
|
|
49
|
Low Q2 pion and proton absorption study
|
|
50
|
- increased simulated events to 100k as discussed last week
|
|
51
|
- fluctuation @ 2.3 GeV/c is now gone
|
|
52
|
- tried increasing to 400k events as with SIMC, but G4 crashed after 170k events
|
|
53
|
- Nathan recalls that Alicia is reading in a real event file for the SHMS
|
|
54
|
focal plane vectors, probably that file contains 170k events
|
|
55
|
|
|
56
|
- made changes to yield scripts, to produce individual yield files for each
|
|
57
|
setting, as Nacer and Junaid does
|
|
58
|
- GH requests a copy of these files when done
|
|
59
|
|
|
60
|
Richard
|
|
61
|
-------
|
|
62
|
KaonLT LTsep
|
|
63
|
- m_lambda correction now in eps_n_theta.f
|
|
64
|
- thetacm now 9.77-19.62deg, down from 23-30deg before
|
|
65
|
- the difference is roughly 12deg per bin, with the difference more
|
|
66
|
significant for the smallest t-bin
|
|
67
|
|
|
68
|
- as a result LT, TT need to be completely refit in LT-separations
|
|
69
|
- sees a t-dependence, now trying functional forms
|
|
70
|
LT=p9*exp(-p10**|t|)*sin(thetacm) TT=p13/(|t|**p14)*sin(thetacm)**2
|
|
71
|
- hitting the edge of parameter fit limits, need to adjust limits
|
|
72
|
- TT fits: fixed p13 and varying p14 in the t-dependence
|
|
73
|
LT fits: fixed p9 and varying p10
|
|
74
|
- Garth: suggests to estimate p10,p14 t-dependence parameters by hand and
|
|
75
|
fitting p9,p13 while keeping p10,p14 fixed. After p9,p13 are converged,
|
|
76
|
then fix them and try fitting p10,p14
|
|
77
|
|
|
78
|
Nacer
|
|
79
|
-----
|
|
80
|
- shows CAP Congress slides, lots of suggestions
|
|
81
|
|
|
82
|
Nathan
|
|
83
|
------
|
|
84
|
Looking at two issues
|
|
85
|
- HMS timing weirdness, due to 2 hodoscope bars?
|
|
86
|
- something in CoinTime clearly changed when Reference Time cuts were fixed
|
|
87
|
- trying to look at it using the hodoscope calibration script, but the script
|
|
88
|
is not easily allowing CoinTime to be added to the output ROOT tree
|
|
89
|
- also has some LH2 boiling behavior to investigate
|
|
90
|
|
|
91
|
- will meet with Dave in person next Tuesday, after all-hands meeting
|
|
92
|
|
|
93
|
Junaid
|
|
94
|
------
|
|
95
|
- shows CAP Congress slides, more suggestions
|
|
96
|
|
|
97
|
Ivan
|
|
98
|
----
|
|
99
|
Q2=0.5 BSA analysis
|
|
100
|
- still waiting on data replay
|
|
101
|
- to recap, Alicia had replayed the Q2=0.5 data with helicity enabled, but
|
|
102
|
somehow Nacer's timing offsets were not properly included
|
|
103
|
- Nacer is now replaying the data with helicity enabled
|
|
104
|
|
|
105
|
- has Nacer's t-bin limits, will investigate
|
|
106
|
- BSA analysis does not apply diamond cut, so the t-range of the data will be
|
|
107
|
larger than Nacer's, will need to add extra t-bins at bottom and top of
|
|
108
|
t-range
|
|
109
|
- calculating mean Q2,W for each bin, look reasonable
|
|
110
|
|
|
111
|
- will learn how to run SIMC for Lambda,Sigma peak fitting
|
|
112
|
- will get SIMC input files from Nacer
|
|
113
|
|
|
114
|
|
|
115
|
Next Meeting
|
|
116
|
------------
|
|
117
|
- next week's meeting is canceled, due to so many people being away at CAP
|
|
118
|
Congress
|
|
119
|
- the following week is Juneteenth holiday in USA, so we will meet at a
|
|
120
|
different time
|
|
121
|
|
|
122
|
- Fri June 20 @ 11:00 Eastern/9:00 Regina
|
|
123
|
- PionLT will go first
|
|
124
|
|
|
125
|
|
|
126
|
|
|
127
|
|
