Project

General

Profile

Kaon LT Meetings » mtg_24oct17.txt

Garth Huber, 10/18/2024 04:32 PM

 
1
                 Oct 17/24 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, Alicia Postuma, Muhammad Junaid, Nathan Heinrich,
10
   Vijay Kumar, Ali Usman, Nacer Hamdi, Argha Das
11
JLab - Dave Gaskell
12
CSULA - Konrad Aniol
13
CUA - Tanja Horn
14
Virginia - Richard Trotta
15
Ohio - Julie Roche
16

    
17
Nathan
18
------
19
- working on random subtractions on PionLT Coin Lumi data, no report yet
20

    
21
Junaid
22
------
23
PionLT pi+ PID study, 5.9 GeV setting
24
- applied Aero>3.0pe and 1.2<RF<3.4 cuts
25
  - Dave: prefer to use fewest #cuts possible, as each one needs an efficiency
26
    to be evaluated, and possibly larger systematic uncertainties
27
  - Garth: but if extra cut means that the applied cuts can be looser, this
28
    results in smaller cut dependence, and lower systematics.  So it depends on
29
    exactly what cuts are needed for the data in question
30

    
31
  - Dave: is the path length correction implemented in this RF time?
32
    - no, still looking into that
33
    - *NB* Stephen had done some initial implementation, best to consult him
34

    
35
- shows pi+n MM peak under different cuts, estimated #counts in peak with
36
  background
37
  - difference in #counts between Acceptance only, and Acceptance+CoinTime+Aero
38
    is very large, 21k vs 14k
39
  - *NB* need to understand which cut is causing such a large drop in #counts,
40
    seems unlikely to be random subtraction since the counts are all in pi+n MM
41
    peak
42
  - Ali: *NB* suggests to try a wide CoinTime cut in the Acceptance only plot,
43
    wide enough to not remove p, K+ but still exclude randoms
44

    
45
- will repeat stdy for 7.9 and 8.5 GeV settings from 2022 data
46

    
47
HMS Matrix Elements
48
- implementing new HMS ME for 6.6 GeV/c setting
49

    
50
Richard
51
-------
52
KaonLT trying different sigTT parameterizations for Q2=3.0, W=3.14 data set
53
- the different paramterizations tried:
54
  - Marco's thesis sigTT form
55
  - Marco's sigTT with sin^2(theta) and sin^3(theta) added
56
  - Vijay's thesis sigTT form, with pole term removed
57
  - Richard's earlier function:
58
    (-p13*|t|+p14)*|t|**(Q^2/p15)-p16*Q^2*sin^2(theta)
59
- all use 1/(W^2-mp^2)**n with n=2.25
60

    
61
- Data/MC ratio plots vs phi for all parameterizations, all after 5 iterations
62
- Marco's thesis form gives slightly better fit than the others
63
  - Marco with sin^2(theta) is similar
64
  - all 5 have similar oscillations in ratio vs phi, but a bit more damped with
65
    Marco equation
66
- will do more iterations w/ Marco's sigTT and look at other settings
67

    
68
- Garth: the calculated chi-square for your plots seems too high in
69
  comparison with the fluctuations in the plots
70
  - *NB* need to recheck chi-square calculation, suspicion is that statistical
71
    errors are not taken into account correctly
72

    
73
Vijay
74
-----
75
Replaying Q^2=0.42 PionLT data
76
- running into some problems adapting replay scripts for Alma9
77
  - getting a STE_LAUNCH_FAIL error, indicating incorrect batch queue
78
    parameters
79
  - Dave: are you using hcswif script which was hardwired to CentOS7?  If so,
80
    you will need to modify it
81

    
82
Alicia
83
------
84
BSA revised manuscript has been submitted to PRL, waiting w/ editor
85

    
86
Ali
87
---
88
Back to thesis writing after returning from DNP meeting in Boston
89
- next analysis step will be to evaluate systematic uncertainties on piDelta
90
  BSA
91

    
92
Nacer
93
-----
94
KaonLT Heep-COIN analysis
95
- using new SHMS-3/4 effs after Mark's code improvements (more restrictive
96
  selection criteria)
97
  - effs now >99.5%, vs 92-97% before
98
- shows plots of Data vs SIMC under various conditions
99
  - no cuts
100
  - CoinTime, HCer, HCal, MMp(exclude pi0)<0.1 GeV
101
  - after cuts, EM, PM, W data distributions are much closer to SIMC prediction
102
  - Jule: there is a deviation "small extra bump" of data around PM~0.1 GeV/c
103
    not seen in the simulation
104
    
105
- Dave: Mark Jones recently reminded that in his VCS analysis, there was a
106
    low W facture anomaly that he resolved in a modified tracking algorithm
107
    - changed how clusters are defined, more candiate tracks per event, better
108
      selection of "best track" in event
109
    - There are four main changes. Each can be turned on/off separately by
110
      parameters. In the end, the VCS analysis used them all.
111
    - *NB* see Mark's presentation posted on RedMine: MJones-HCANA_DC-update.pdf
112
    - Mark added output to the root tree that makes it easier to understand the
113
      clustering and tracking which is not documented in the slideshow
114
      (though hinted at it at the end)
115
    - *NB* GH will see if Mark can give a summary of it at our next meeting
116

    
117
- Data/MC ratios w/o proton absorption:
118
  - 0.992-1.011 +/- 0.007, almost no beam energy dependence
119
  - Garth: Nacer had looked earlier at the SIMC elastic model dependence, which
120
    is 2-5%, depending on Q^2
121

    
122
KaonLT Heep-SINGLES analysis
123
- HMS electrons: 3.8 GeV, P_HMS=2.026 GeV/c
124
  - Dave: PMX,Y,Z,PM,EM not defined in hcana for singles events
125
  - W shows an enhancement at the Delta mass in data, apply 0.9<W<1.05 cut to
126
    eliminate
127
  - agreement between Data and MC for HMS Focal Plane variables very good
128
  - Data/MC ratio 1.037+/-0.001
129

    
130
- SHMS electrons: run 6629
131
  - W data plot is empty
132
  - *NB* this works for Vijay, so check with him on what's wrong
133

    
134
Next Meeting
135
-------------
136
- Thur Oct 24 @ 16:30 Eastern/14:30 Regina
137
  - KaonLT will go first
138

    
139

    
140
  
141

    
142

    
143
    
(520-520/567)