|
1
|
May 16/24 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, Ali Usman, Nathan Heinrich, Vijay Kumar, Zach Sullivan,
|
|
13
|
Nacer Hamdi, Muhammad Junaid, Alicia Postuma
|
|
14
|
York - Stephen Kay
|
|
15
|
JLab - Dave Gaskell
|
|
16
|
Ohio - Julie Roche
|
|
17
|
CUA - Casey Morean
|
|
18
|
FIU - Pete Markowitz
|
|
19
|
CSULA - Konrad Aniol
|
|
20
|
|
|
21
|
Nathan
|
|
22
|
------
|
|
23
|
BCM offset for low current runs:
|
|
24
|
SHMS 16738-16746 HMS 16727-16737
|
|
25
|
- applied a 30nA offset
|
|
26
|
- seems to work better for HMS than SHMS, SHMS looks like it would need a
|
|
27
|
slightly larger offset
|
|
28
|
- Runs 12144-12154 have LT that vary widely, for these the HMS is more reliable
|
|
29
|
than SHMS, but the SHMS rate is 10x the HMS rate
|
|
30
|
- based on this Dave prefers to use the offset that works best for HMS
|
|
31
|
- GH is less convinced, since for the 16xxx runs the HMS and SHMS rates are
|
|
32
|
comparable, so GH would prefer to find a compromise offset between HMS and
|
|
33
|
SHMS
|
|
34
|
- in the end, it probably won't make much difference between 30nA and 50nA
|
|
35
|
|
|
36
|
Next steps:
|
|
37
|
- For Runs 12181-91 will play a bit more with the offset, will be ~150nA
|
|
38
|
- then do a BCM2 quadratic term check
|
|
39
|
- calculate uncertainties in I,Q_beam for each run by propagating uncertainties
|
|
40
|
in calib offset in slope with the specific current used in each run
|
|
41
|
|
|
42
|
Junaid
|
|
43
|
------
|
|
44
|
PionLT Heep offset study
|
|
45
|
- beam energy for 7.9 GeV in standard.kinematics was not updated
|
|
46
|
- using an average of two Arc energy measurements
|
|
47
|
- shows result of OOP offset fit, needed to apply an estimated systematic
|
|
48
|
uncertainty (0.0014/Pshms) to get the chi-square/dfm near 1
|
|
49
|
|
|
50
|
- Dave: need to use Mark's calculated beam energies at Hall C target, the Arc
|
|
51
|
energy measurement gives an average value in the Arc, corresponding to about
|
|
52
|
the middle of the Arc. Mark calculates the synchrotron radiation from the
|
|
53
|
center of the Arc to the pivot, you need to subtract this number from the Arc
|
|
54
|
measurement to get the pivot energy value
|
|
55
|
- the difference is negligible for energies < 8 GeV, but grows quickly with
|
|
56
|
energy above this, particularly for 10-11 GeV beam
|
|
57
|
- Mark's table is at:
|
|
58
|
https://hallcweb.jlab.org/wiki/index.php/Table_of_12_GeV_Beam_Energy_Measurements
|
|
59
|
|
|
60
|
- updated report template files and BCM2 for current
|
|
61
|
|
|
62
|
Next steps:
|
|
63
|
- moving on to HMS Cer, Cal electron efficiencies
|
|
64
|
- waiting on GH to redo in-plane offsets
|
|
65
|
|
|
66
|
Vijay
|
|
67
|
-----
|
|
68
|
- no report, working on last parts of thesis
|
|
69
|
|
|
70
|
Alicia
|
|
71
|
------
|
|
72
|
BSA analysis
|
|
73
|
- in contact w/ B-G Yu re. Regge model calcs
|
|
74
|
- specifically looking for theory calc for our bin-by-bin kinematics
|
|
75
|
- hoping to distribute a draft manuscript to this group next week
|
|
76
|
|
|
77
|
Ali
|
|
78
|
---
|
|
79
|
piDelta analysis
|
|
80
|
- finished Q2=3, W=2.32 shape study and extracted BSA
|
|
81
|
- two settings left, Q2=3, W=3.14 and Q2=2.1
|
|
82
|
- hoping to have results in 1-2 weeks
|
|
83
|
- also working on parts of thesis
|
|
84
|
|
|
85
|
Nacer
|
|
86
|
-----
|
|
87
|
Low Q2 KaonLT
|
|
88
|
- setting up SIMC for first time
|
|
89
|
- had to do some tweaks to get ROOT conversion program to work
|
|
90
|
- recon script updates, these are experiment specific, not part of SIMC package
|
|
91
|
- Dave's code changes for ALMA9 OS change
|
|
92
|
|
|
93
|
Next steps:
|
|
94
|
- need to apply beam energy, angle and momentum offsets and check that they're
|
|
95
|
implemented corectly
|
|
96
|
- then move to Heep yields and Data/MC ratios
|
|
97
|
|
|
98
|
Stephen
|
|
99
|
-------
|
|
100
|
Discussion about pending change of iFarm to ALMA9 OS
|
|
101
|
- a lot of hcana stuff is based on older version of ROOT
|
|
102
|
- a good option would be to keep an older copy of ROOT on group disk
|
|
103
|
- also need to confirm which version of Python is needed
|
|
104
|
- a good path forward would seem to take the Hall C RH7 container and get
|
|
105
|
things set up in there
|
|
106
|
- people can ssh to ifarm9 (ALMA9 interactive node) now to check what breaks
|
|
107
|
|
|
108
|
- Stephen, Nathan, Junaid and Nacer will work together on this and report back
|
|
109
|
to group next week
|
|
110
|
|
|
111
|
|
|
112
|
|