|
1
|
Oct 3/25 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, Alicia Postuma, Nermin Sadoun, Nathan Heinrich,
|
|
13
|
Vijay Kumar, Nacer Hamdi, Muhammad Junaid
|
|
14
|
Virginia - Richard Trotta
|
|
15
|
Ohio - Julie Roche
|
|
16
|
JLab - Dave Gaskell
|
|
17
|
CUA - Tanja Horn, Chi Kin Tam, BC Manoj
|
|
18
|
FIU - Pete Markowitz
|
|
19
|
|
|
20
|
Nathan
|
|
21
|
------
|
|
22
|
PionLT Coin Lumi analysis
|
|
23
|
- final analysis of Coin Yield vs Coin Rate (up to ~2 kHz)
|
|
24
|
- fit individual slopes for each setting, and propagated errors to obtain a
|
|
25
|
weighted average correction of
|
|
26
|
3.1%/kHz +/- 0.07%(stat) +/- 0.35%(syst)
|
|
27
|
where the systematic uncertainty comes from the variation in slope with
|
|
28
|
setting, about a 15% uncertainty in the correction overall
|
|
29
|
- also looked at Coin Yield vs HMS Rate (up to 180 kHz) to see if it's better
|
|
30
|
0.0355%/kHz +/- 0.009%(stat) +/- 0.024%(syst)
|
|
31
|
the combined error is almost 100% of the correction!
|
|
32
|
Definitely it's better to use the correction vs Coin Rate
|
|
33
|
|
|
34
|
Junaid
|
|
35
|
------
|
|
36
|
PionLT Q2=3.85 W=2.62 LT-sep
|
|
37
|
- Data/MC ratios had phi-oscillations last week, so modified LT function to
|
|
38
|
sigLT=(p9/Q2+p10/|t|)*sin(thetacm)
|
|
39
|
- after 2 iterations:
|
|
40
|
low epsilon has oscillations in higher t-bins
|
|
41
|
high epsilon has oscillations across a wider range of t-bins
|
|
42
|
- then tried sigLT=(p9/Q2+exp(-10*|t|)*p11/(p12+|t|))*sin(thetacm)
|
|
43
|
- initially started with p10=p12=0
|
|
44
|
ratios much better behaved
|
|
45
|
- then allowed p10,p12 to float
|
|
46
|
ended up with more oscillations at high epsilon
|
|
47
|
now doing 3rd iteration to see what happens
|
|
48
|
|
|
49
|
- Garth suggests to move on to one of the other Q2=3.85 settings, as this seems
|
|
50
|
faiarly good and you may learn lessons there to apply to this setting
|
|
51
|
- Richard agrees this is ready to move to next setting
|
|
52
|
|
|
53
|
BC Manoj
|
|
54
|
--------
|
|
55
|
- setting up iFarm, got help from Junaid
|
|
56
|
- will look at Heep delta-scans for optics
|
|
57
|
|
|
58
|
Alicia
|
|
59
|
------
|
|
60
|
BSA changes to response to referees
|
|
61
|
- doing some restructuring of response to put "what we did" at beginning of
|
|
62
|
discussion, followed by more details
|
|
63
|
- planning to resubmit on Monday
|
|
64
|
|
|
65
|
Vijay
|
|
66
|
-----
|
|
67
|
New Q2=0.375, 0.425 results
|
|
68
|
- previously sigL,T were very simple, with no Q2-dependence
|
|
69
|
- now added (1/Q4) dependence to both
|
|
70
|
- made a spreadsheet comparing LT-sep values for both function fits,
|
|
71
|
differences are larger than statistical uncertainties at lowest -t, similar
|
|
72
|
to statistics at higher -t, so we might need some further improvement
|
|
73
|
- GH made a series of plots comparing Vijay's data to Ackermann
|
|
74
|
- Q6 and Wfac scaling applied to Ackermann data to approximately bring to
|
|
75
|
same kinematics
|
|
76
|
- generally good agreement for sigL, but our sigT values are much higher
|
|
77
|
- some discrepancies between different parts of Ackermann data, not clear
|
|
78
|
exactly how they have binned/combined different parts of their dataset
|
|
79
|
|
|
80
|
Next steps
|
|
81
|
- need to apply pion absorption corr to pi+ data, and proton absorption corr to
|
|
82
|
Heep data
|
|
83
|
- also will make raw CoinTime plots like Nathan and investigate Coin Blocking
|
|
84
|
correction
|
|
85
|
|
|
86
|
Richard
|
|
87
|
-------
|
|
88
|
Working on a paper "The Fit-Finder Algorithm for LT-separation Analysis"
|
|
89
|
- algorithm to get best functional form from separated cross sections
|
|
90
|
- testing the algorithm on different datasets for purposes of paper
|
|
91
|
- looking at Fpi-2 Q2=1.6, 2.45; W=2.22 separated cross sections
|
|
92
|
- Vijay and Nacer will send their latest results
|
|
93
|
|
|
94
|
KaonLT LT-sep
|
|
95
|
- currently replaying Q2=3.0, 4.4, 5.5 data
|
|
96
|
|
|
97
|
Chi Kin
|
|
98
|
-------
|
|
99
|
KaonLT LT-sep
|
|
100
|
- Code Block regarding BCM current file was commented out in forming replay
|
|
101
|
file, this has been fixed
|
|
102
|
- used new database file, Expt Diamonds now agree much closer to SIMC diamonds
|
|
103
|
|
|
104
|
- Q2=3.0, W=3.14 analysis
|
|
105
|
- chose 4 t-bins, 15 phi-bins, will compare to Richard's results
|
|
106
|
- did pion subtraction for all t-phi bins, in some cases sees a Sigma peak
|
|
107
|
which is also subtracted
|
|
108
|
|
|
109
|
- Iter 00: start with Richard's recommended parameters
|
|
110
|
- Iter 01: Data/SIMC ratios move much closer to 1
|
|
111
|
- Iter 02: ratios blow up, but come back after 4 iterations
|
|
112
|
- looked at trend in L,T vs iteration number, found that sigT fit failed at
|
|
113
|
Iter 04, will be fixed
|
|
114
|
|
|
115
|
- comparsion of data and MC focal plane and physics histos
|
|
116
|
- no MM cuts yet on data, so sees differences w/SIMC
|
|
117
|
- will include pion subtraction, etc
|
|
118
|
|
|
119
|
Nacer
|
|
120
|
-----
|
|
121
|
KaonLT low Q2 LT-sep
|
|
122
|
- will try different models for L,T
|
|
123
|
- first step is to recheck MM plots for each (t,phi) bin
|
|
124
|
- needed to replay data as didn't have MM for each (t,phi) before
|
|
125
|
- then will try to add a functional form for LT,TT, right now they are both
|
|
126
|
zero in the parameterization, but non-zero in the Rosenbluth fit
|
|
127
|
|
|
128
|
Nermin
|
|
129
|
------
|
|
130
|
Like BC Manoj, setting up environment on iFarm, getting info from Junaid
|
|
131
|
|
|
132
|
Garth
|
|
133
|
-----
|
|
134
|
- still needs to look at Gabi's HeepCheck code modifications and generate new
|
|
135
|
offsets
|
|
136
|
- in about a month, is willing to give the new students a tutorial on the
|
|
137
|
PionLT run plan, describing how an LT-separation expt is structured, so they
|
|
138
|
can better understand how everything fits together
|
|
139
|
|
|
140
|
Next Meeting
|
|
141
|
------------
|
|
142
|
- Fri Oct 10 @ 11:00 Eastern/9:00 Regina
|
|
143
|
- KaonLT will go first
|
|
144
|
|
|
145
|
- We will see if there's time on Thursday for a short meeting, in order to keep
|
|
146
|
the Friday meetings from getting too long
|
|
147
|
Please fill out the poll at:
|
|
148
|
https://www.when2meet.com/?32764634-ro4er
|
|
149
|
|
|
150
|
|
|
151
|
|
|
152
|
|
|
153
|
|
|
154
|
|
|
155
|
|