Current status of K* Analysis

1
Current status of K Analysis
LEPS group meeting

• Sanghoon Hwang

Pusan National University
May 1, 2008, SINICA
2
Outline
Outlook
Quick Analysis
Calibration
Data status

1. Status of Data
2. Current status of calibration
3. Quick analysis
4. Summary Outlook

by S. H. Hwang
3
Outlook
Quick Analysis
Calibration
Data status
Current status of data
Period of experiment
2007. 10/6 10/18.
2007. 11/8. 12. 17.
Online Trigger
Total 485 M
Horizontal 244.7M
Vertical 240.9M
Filling pattern
r37768 r37808 ? 2/29-filling 26
bunches r37809 r37912 ? 160bunch-train x
12 r37922 r38022 ? 1/14-filling 12
bunches r38023 r38068 ? 160bunch-train x
12 r38069 r38314 ? 203 bunches
by S. H. Hwang
4
Outlook
Quick Analysis
Calibration
Data status
Current status of Calibration
LEPS ana
LEPSana LEPSres(for DCs calibration) are
working well on the hepfarm2 Perl shell to
submit Condor system was done.
Ntuple
We produced 1st ntuples to check run-dependency
and calibrate ToF DCs parameters on the Miho
Condor system. (_at_miho /home/shhwang/kstar_nt)
? Input preliminary parameter of DCs ToF.
We produced 2nd ntuples on the Condor system at
April 23. (_at_miho /home/shhwang/nt_v2.0)

• Input new parameter of DCs(dc_wt0, dc_drf,
  dc_res, dc_drfagl)
• Input T0, Sol parameters for ToF

(Parameters file _at_miho /home/shhwang/parameters_
v2.0)
Tagger
SSD alignment
We are going to calibrate
Attenuation of ToF
by S. H. Hwang
5
Outlook
Quick Analysis
Calibration
Data status
DC calibration
Calibration Step
1. DC t0 calibration for each wire
2. DC xtangle calibration (dc_drf, dc_drfagl,
dc_res)
3. Check X2 probability to compare with ntuple
quality
DC resolution parameter dist.
ntrk1, -1050ltvtzlt-860, qq1, 0.8ltpmlt1.2,
abs(ybar)gt30
Mean of Prbchi2
c2 probability for 2nd produced Ntuple
Runnumber
by S. H. Hwang
6
Outlook
Quick Analysis
Calibration
Data status
Tof Calibration
Calibration Step
1. RF calibration
a. RF slewing correction
b. Each RF mean position fitting
(2. Tof Slewing correction)
M2 P2(1/b2 1)
pp2(c/sleng)2 (rawToF x 0.025 t0glb
T0)2-1
3. T0 calibration
T0 sqrt(pm2/pp2)1 (rawtof0.025 t0glb )
4. Speed of light in the ToF.
Selected particle distribution for T0
calibration
(5. Attenuation Length)
Ytrk Sol Tofdiff Offset
Distribution of Sol parameter
by S. H. Hwang
7
Outlook
Quick Analysis
Calibration
Data status
Mass2 Run Dependency
0.4ltpplt0.9, 0.5ltpm2lt1.1
pplt1.5, abs(ybar).ge.60, qq1
pplt1.5, 0.15ltpm2lt0.35
pplt1.5, abs(ybar).ge.60, qq-1
by S. H. Hwang
8
Outlook
Quick Analysis
Calibration
Data status
Tof resolution
ToF resolution of each ToF bar
17.58 mm
Ytrk-ytdc(mm)
by S. H. Hwang
9
Outlook
Quick Analysis
Calibration
Data status
Tof resolution
(Run dependency of ToF bars resolution for 2nd
Ntuples)
Prbchi2gt0.02, itoftofid, ntoullt6,
abs(ytof-tofdiff)lt200
ytof-tofdiff
ytof-tofdiff
by S. H. Hwang
10
Outlook
Quick Analysis
Calibration
Data status
Tof resolution
Prbchi2gt0.02, itoftofid, ntoullt6,
abs(ytof-tofdiff)lt200
ytof-tofdiff
ytof-tofdiff
by S. H. Hwang
11
Outlook
Quick Analysis
Calibration
Data status
Tof resolution
Prbchi2gt0.02, itoftofid, ntoullt6,
abs(ytof-tofdiff)lt200
ytof-tofdiff
ytof-tofdiff
by S. H. Hwang
12
Outlook
Quick Analysis
Calibration
Data status
Tof resolution
Prbchi2gt0.02, itoftofid, ntoullt6,
abs(ytof-tofdiff)lt200
ytof-tofdiff
ytof-tofdiff
by S. H. Hwang
13
Particle identification
Outlook
Quick Analysis
Calibration
Data status
Counts
Momentum (GeV/c)
Mass/Charge (GeV/c2)
Counts
Mass/Charge (GeV/c2)
Photon Energy (GeV)
by S. H. Hwang
14
EE veto bar
Outlook
Quick Analysis
Calibration
Data status
virtual plane of EE veto bar
virtual plane of eeBlocker
Virtual plane of y-axis(mm)
Virtual plane of y-axis(mm)
Virtual plane of X-axis(mm)
Virtual plane of X-axis(mm)
by S. H. Hwang
15
Particle selection
Outlook
Quick Analysis
Calibration
Data status
Particle selection 4s
Counts
ntrk gt 1
prbchi2 gt 0.02
ithtofhit gt 0
abs(ytof-tofdiff) lt 90
abs(itof-tofid) lt 2
fntag 1
noutl lt 6
abs(pm) gt 0
tdcee(1) lt 0
tdcee(2) lt 0
Counts
by S. H. Hwang
16
Vertex cut
Outlook
Quick Analysis
Calibration
Data status
Vty
Start count
Vertex Detector
Vtx
Vty
-866ltvtzlt1070 -15ltvtxlt15 -15ltvtylt15
Vtx
by S. H. Hwang
17
Cut condition
Outlook
Quick Analysis
Calibration
Data status
K mass ? p mass
gp ? ppp-
by S. H. Hwang
18
Cut condition
Outlook
Quick Analysis
Calibration
Data status
Photon Energy
Photon Energy
Eg gt 1.8
Eg gt 1.8
IM(Kp-)
MM(gKp-)
by S. H. Hwang
19
Cut condition
Outlook
Quick Analysis
Calibration
Data status
Cut
by S. H. Hwang
20
Preliminary Results
Outlook
Quick Analysis
Calibration
Data status
K0(892)
Mean 0.8862 Sigma 0.0255
S(1189)
Mean 1.175 Sigma 0.014
by S. H. Hwang
21
Preliminary Results
Outlook
Quick Analysis
Calibration
Data status
f k0
w/o k
with k
qc.m. k0
by S. H. Hwang
22
Preliminary Results
Outlook
Quick Analysis
Calibration
Data status
of event 169 (0.81.0)
Horizontal
Vertical
of event 410 (0.81.0)
by S. H. Hwang
23
Preliminary Results
Outlook
Quick Analysis
Calibration
Data status
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.2 GeV
cos(qC.M.) 1bin 0.1
by S. H. Hwang
24
Summary Outlook
Outlook
Quick Analysis
Calibration
Data status

• We have collected approximately 500 events of
  K photoproduction reaction with linearly
  polarized photons from 1.5 GeV to 3.0 GeV.
• We are going to calibrate Tag and SSD
  alignment.
• We are going to measure a beam asymmetry which
  gives a clue on t-channel exchange particles of
  K photoproduction.

by S. H. Hwang
25

• Thanks for
• LEPS collaborators

by S. H. Hwang
26
Outlook
Results
K experiment
Calibration
T0 calibration methode
M2 P2(1/b2 1)
pp2(c/sleng)2 (rawToF 0.025 t0glb
T0)2-1
T0 sqrt(Mass2/pp2)1 (rawtof0.025 t0glb )
PID
by S. H. Hwang
27
Backup page
Outlook
Results
K Experiment
Outline
PID 4s
cut L, MM(gpp-), 0.85ltIMlt1, 1.1ltMMlt1.25
Counts
Counts
cut L, MM(gpp-)
Counts
Mass/charge (GeV/c2)
Mass/charge (GeV/c2)
by S. H. Hwang
28
Backup page
Outlook
Results
K Experiment
Outline
cut L, MM(gpp-), 0.8ltIMlt1, 1.1ltMMlt1.25
PID 4s
Momentum (GeV/c)
Momentum (GeV/c)
Mass/charge (GeV/c2)
cut L, MM(gpp-)
Momentum (GeV/c)
Mass/charge (GeV/c2)
Mass/charge (GeV/c2)
by S. H. Hwang
29
Backup page
Outlook
Results
K Experiment
Outline
MC
Data
by S. H. Hwang
30
Backup page
Outlook
Results
K Experiment
Outline
Pi- momentum distribution vs. cos(theta)
K momentum distribution vs. cos(theta)
by S. H. Hwang
31
Backup page
Outlook
Results
K Experiment
Outline
by S. H. Hwang
32
Backup page
Outlook
Results
K Experiment
Outline
by S. H. Hwang
33
Backup page
Outlook
Results
K Experiment
Outline
hori
vert
by S. H. Hwang
34
Backup page
Outlook
Results
K Experiment
Outline
by S. H. Hwang
35
Outlook
Results
K Experiment
Outline
Backup page
by S. H. Hwang
36
Outlook
Results
K Experiment
Outline
Backup page
K
by S. H. Hwang
37
Preliminary Results
Outlook
Quick Analysis
Calibration
Data status
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.4 GeV
cos(qC.M.) 1bin 0.1
by S. H. Hwang
38
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.2 GeV
cos(qC.M.) 1bin 0.1
by S. H. Hwang
39
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.2 GeV
cos(qC.M.) 1bin 0.133
by S. H. Hwang
40
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.2 GeV
cos(qC.M.) 1bin 0.2
by S. H. Hwang
41
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.4 GeV
cos(qC.M.) 1bin 0.1
by S. H. Hwang
42
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.4 GeV
cos(qC.M.) 1bin 0.133
by S. H. Hwang
43
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.6 GeV
cos(qC.M.) 1bin 0.133
by S. H. Hwang
44
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.4 GeV
cos(qC.M.) 1bin 0.3
by S. H. Hwang
45
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.85 1.0
Photon Energy 1bin 0.6 GeV
cos(qC.M.) 1bin 0.3
by S. H. Hwang
46
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.2 GeV
cos(qC.M.) 1bin 0.1
by S. H. Hwang
47
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.2 GeV
cos(qC.M.) 1bin 0.133
by S. H. Hwang
48
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.2 GeV
cos(qC.M.) 1bin 0.2
by S. H. Hwang
49
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.4 GeV
cos(qC.M.) 1bin 0.1
by S. H. Hwang
50
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.4 GeV
cos(qC.M.) 1bin 0.133
by S. H. Hwang
51
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.6 GeV
cos(qC.M.) 1bin 0.133
by S. H. Hwang
52
Outlook
Results
K Experiment
Outline
Backup page
Vertical
Horizontal
Mass 0.8 1.0
Photon Energy 1bin 0.4 GeV
cos(qC.M.) 1bin 0.3
by S. H. Hwang
53
Outlook
Results
K experiment
Outline
K(892) Photoproduction
gp ? K0S
u-channel
t-channel
s-channel
by S. H. Hwang
54
Outlook
Results
K experiment
Outline
K(892) Photoproduction
( gp ? K0S)
CLAS _at_2006
(Circular polarized vertual photon)
K ? pseudoscalar meson (I1/2, JP0-)
k ? scalar meson (I1/2, JP0)
gp ? KL
gp ? K0S
w/o k
w/o k
with k
with k
Dominate at forward angle ? t-channel exchange
Parity asymmetry can seprated k meson
contribution.
by S. H. Hwang
55
Backup pages
Outlook
Results
K experiment
Outline
( gp ? K0S)
K(892) I(Jp) ½(1-) (? Vector Meson) K0
mass 896.00 0.25 MeV full width 50.3
0.6 MeV Decay modes Fraction ratio Kp
100 K0g
(2.31 0.20) x 10-3) Kg
(9.9 0.9 ) x 10-4 Kpp 7 x
10-4
by S. H. Hwang
56
Backup pages
Outlook
Results
K Experiment
Outline
by S. H. Hwang
57
Backup pages
Outlook
Results
K Experiment
Outline
by S. H. Hwang