Project

General

Profile

Kaon LT Meetings » mtg_22nov23.txt

Garth Huber, 11/23/2022 01:38 PM

 
1
                 Nov 23/22 PionLT/KaonLT Analysis Meeting Notes
2
                 ----------------------------------------------
3
                           (Notes by GH and SJDK)
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, Stephen Kay, Ali Usman, Alicia Postuma, Nathan Heinrich,
13
   Love Preet
14
CSULA - Konrad Aniol
15
CUA - Richard Trotta, Tanja Horn
16
FUI - Pete Markowitz
17
Ohio - Julie Roche
18
Glasgow - David Hamilton
19

    
20
Nathan Updates
21
--------------
22
- PhD Committee meeting went well
23
- Classes to catch up on
24
- Likely have an update in ~2 weeks
25

    
26
Stephen Updates
27
---------------
28
RF timing resolution improvements
29
  - Particle corrected RF time working
30
  - Individual offsets added in
31
  - Works nicely for various settings
32
  - Actually helps with the 2ns setting quite a lot, useful for PID here in the
33
    kaon case
34
  - trying to remove residual correlation with CoinTime, but didn't get it to
35
    work yet
36
  - will push the corrections by particle type soon
37

    
38
Richard Updates
39
---------------
40
Variable Differences between hcana and SIMC
41
- Emailed Carlos about his calculations
42
  - Carlos explicitly recalculates everything
43
  - Will have to redo calculation in SIMC
44
  - starting to work on SIMC code changes
45

    
46
Luminosity Scans
47
- Ali has been playing with tracking parameters
48
  - previously was using combined SING+COIN to determine trackeff
49
  - now using trackeff from SING only
50
  - improves positive polarity current dependence by 5%, so only 15%
51
    remaining
52
- BCMcurrent offsets
53
  - tried a 100nA offset, tightened up the rate dependence, makes linear
54
    target boiling effect more apparent
55
  - Improvements to this, will try 10nA next
56

    
57
Bill's LT-sep Code
58
- will contact Bill this week about some questions
59

    
60
Alicia Updates
61
--------------
62
Beam Spin Asymmetry (BSA)
63
- replayed Q2=3, W=2.32, hi-eps, S.Wood earlier did Center setting for
64
  comparison
65
  - New analysis script which gets +ve/-ve helicity trees
66
  - focal plane cuts applied, RF cut is open, PID cuts but no HGC cut
67
  - S.Wood is looking at the Beam Polarization, so just raw asymmetries so far
68
  - no dummy subtraction
69
  - Center setting comparison with S.Wood looks good
70
  - Left setting has low stats for phi ~ 0
71
  - Right setting has low stats for phi ~ +/-pi
72
  - Trying to choose -t bins for the data
73
     - Equal number of events per bin, not equal widths
74
  - Combined (roughly) all three settings to get initial view of asymmetry
75
    t-dependence
76
  - See sinusoidal relationship in each
77
  - Amplitude of the asymmetry grows with -t, looks very nice!
78

    
79
- Question: t binning
80
   - Ali should probably use consistent binning in -t with the helicity
81
     analysis, to simplify interpretation of the data
82
   - Bin 5: *investigate* changing upper cut (i.e. remove some of the long
83
     tail), to simplify comparison to theory
84
   - Cut off low -t bin 1 for similar reason
85
   - Equalize bins 2 and 3 in terms of width?
86

    
87
   - On plot - Centre of each bin is shown, not the average. Could plot vs
88
     average -t of each bin
89
   - Q2/W/Epsilon distributions for each -t bin
90
      - Want average values for each bin
91
   - Tanja: Should investigate binning in K+ data too
92
      - Richard can make similar plots to Alicia quite quickly
93

    
94
- Don't really need asymmetry for both epsilons
95
   - Just use the one with full phi coverage
96
   - However, do want high/low epsilon to have the same binning (for Ali's
97
     LT-separation), so may briefly need to look at the low epsilon t-binning
98
   - Final fit for sig_LT' extraction will need to include cos(phi) cos(2phi)
99
     in denominator, in addition to dominant sin(phi) in numerator
100

    
101
- Missing Mass Plots
102
   - some background underneath pi+n peak still apparent, but no dummy target
103
     subtraction yet and cuts are not yet optimized
104
   - any background under the pi+n peak is likely to have a different BSA than
105
     the foreground data, will need to do some systematic studies on the effect
106
   - CLAS (Stefan Diehl) analysis dealt with the background by doing a
107
     side-band analysis and applied a correction to their data
108
      - the side-band was selected to be the events to the LEFT of the pi+n peak
109
   - hopefully we can get our data clean enough that that this is not needed
110

    
111
Ali Updates
112
-----------
113
- Discussing with other groups regarding HeeP/Lumi issues
114
  - looking at changes to track reconstruction params, and pruning params
115
- when finalized, will make slides to show details
116
- Heep offset issue on hold until variable difference issue is fixed
117
- new error calculations for all efficiencies (Binomial instead of Gaussian)
118
  - should have something to show next week
119

    
120
Garth Updates 
121
-------------
122
- WNPPC - https://wnppc.triumf.ca/2023/index.html
123
  in Banff National Park (Rocky Mountains) in mid-February
124
- Regina group is sending 5 people.  Abstracts will be circulated as they are
125
  available.
126
- If USA colleagues are interested, the Abstract submission deadline is Dec 15.
127

    
128
Next Meeting
129
------------
130
Wed Nov 30 @ 8:15 Eastern/7:15 Regina/5:15 Pacific
131
- KaonLT will go first
(132-132/397)