|
1
|
Jan 2/25 PionLT/KaonLT Analysis Meeting Notes
|
|
2
|
---------------------------------------------
|
|
3
|
(Notes by GH)
|
|
4
|
|
|
5
|
Today: PionLT will be discussed first
|
|
6
|
|
|
7
|
Present
|
|
8
|
-------
|
|
9
|
Regina - Garth Huber, Nathan Heinrich, Ali Usman, Vijay Kumar, Nacer Hamdi
|
|
10
|
CSULA - Konrad Aniol
|
|
11
|
CUA - Tanja Horn
|
|
12
|
FIU - Pete Markowitz
|
|
13
|
|
|
14
|
Nathan
|
|
15
|
------
|
|
16
|
PionLT luminosity analysis
|
|
17
|
- plots shown of Lumi yields vs Rate and Current
|
|
18
|
- HMS-LH2 scaler yields look pretty consistent, fit result is:
|
|
19
|
(3.5 +/- 0.17%)/100uA
|
|
20
|
- still need to confirm that ELLT is applied correctly to this analysis, if
|
|
21
|
not, the slope might get slightly smaller
|
|
22
|
- unfortunately, no-track, track HMS has some inconsistencies that make it
|
|
23
|
harder to reliably determine the slope
|
|
24
|
|
|
25
|
- SHMS-LH2 scaler yields: up to 2MHz rates were encountered, rates have much
|
|
26
|
more scatter, harder to reliably determine the boiling correction
|
|
27
|
- plots vs rate instead of current may be consistent with an additional rate
|
|
28
|
dependent effect that could be responsible to the greater scatter when
|
|
29
|
plotted vs current
|
|
30
|
|
|
31
|
Next step:
|
|
32
|
- first, get a good LH2 boiling correction from HMS scalers (after checking
|
|
33
|
ELLT)
|
|
34
|
- then apply this to COIN and SHMS data and investigate rate dependence in more
|
|
35
|
detail
|
|
36
|
|
|
37
|
Nacer
|
|
38
|
-----
|
|
39
|
KaonLT physics event selection
|
|
40
|
- starting with Q2=0.5, center SHMS, low eps setting
|
|
41
|
- 4 PID cuts applied:
|
|
42
|
HMS e-: 1) cal_tot_track_norm>0.5 2) hcer_npe>2
|
|
43
|
SHMS K+: 1) plot RF time vs MM and remove main part of pi+ peak while avoiding
|
|
44
|
Lambda MM region
|
|
45
|
2) CTk plot w/RF cut so pi+ peak is much smaller, place cut around
|
|
46
|
clear K+ peak, confirmed correct cut is used vs MM
|
|
47
|
- left and right 3 accidentals peaks are taken several peaks away from
|
|
48
|
main peak
|
|
49
|
- also make a clean pi+ sample for contamination subtraction:
|
|
50
|
- select pi+ RF region and place CoinTime cut using CTpi
|
|
51
|
- then normalize the clean pi+n peak to K+ sample and subtract from MMk
|
|
52
|
- contamination appears to be fairly small, when viewed on log scale the pi+
|
|
53
|
sample varies ~2x under Lambda/Sigma region, not quite flat
|
|
54
|
- looks very promising
|
|
55
|
|
|
56
|
Next step:
|
|
57
|
- will recheck CTk cuts to make sure piDelta region is not removed
|
|
58
|
- setting up scripts for Exp normalized yields
|
|
59
|
|
|
60
|
Vijay
|
|
61
|
-----
|
|
62
|
Low Q2 update
|
|
63
|
- replayed Q2=0.42 data, confirming that cuts needed for Exp normalized yields
|
|
64
|
are okay
|
|
65
|
- found that no CTpi offset was needed, unlike the Q2=0.38 data, so something
|
|
66
|
must have changed in the analysis setup
|
|
67
|
|
|
68
|
- draft slides for Hall C workshop
|
|
69
|
- 31 slides, so need to shorten by ~8 slides to be within 20+5 min limit
|
|
70
|
- GH will give some suggestions tomorrow on combining some slides together
|
|
71
|
- need a dedicated slide on the iterative LT separation, since this is
|
|
72
|
non-standard
|
|
73
|
- Vijay will circulate next draft by email, after more work and shortening
|
|
74
|
|
|
75
|
Ali
|
|
76
|
---
|
|
77
|
Draft slides
|
|
78
|
- length and content seemed appropriate
|
|
79
|
- will distribute slides by email for more detailed comments
|
|
80
|
|
|
81
|
Next Meeting
|
|
82
|
-------------
|
|
83
|
- Thur Jan 9 @ 16:00 Eastern/15:00 Regina
|
|
84
|
- KaonLT will go first
|
|
85
|
- need to review next drafts of slides by Richard, Vijay, Ali
|
|
86
|
|
|
87
|
- we also need to check if people's availability has changed after Jan 16, or if we can
|
|
88
|
keep this time until daylight savings time change in March
|