vertex location status of japan nagoya vertex hunting team y.nonoyama, k.hamada, s.takahashi,...
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Vertex location status of Japan
Nagoya vertex hunting team
Y.Nonoyama, K.Hamada, S.Takahashi,
H.Kubota, R.Komatani
2009 Jan 22 OPERA Japan Meeting
Yoshiaki Nonoyama (Doctor course student):Refresh (set up Temp and Humi monitor system)PEANUT
Kaname Hamada (Doctor course student): RefreshImprove mechanical accuracy of S-UTS stage Develop track reconstruction soft-ware
Satoru Takahashi (Doctor course student):DONUTRefreshGamma-ray telescope with Emulsion Chamber
Hirotaka Kubota (Doctor course student):RefreshFragmentation of heavy-ion Gold deposition development
Ryosuke Komatani (Muster course student):Develop online data process soft-ware
Our history
scan back
volume scanaround VTX prediction point
(~1cm*1cm*10plates)
VTX located
volume scanaround stop plate
(~1cm*1cm*6plates)
direct VTX hunting
VTX location method
scan back & volume scan
not foundVTX search
found
partner & parent search
276
ECC arrived
109
114
in progress
VTX located
21
re-glycerin, wait sheeting
19
CS
42
CS->ECC
0
scan back
62
volume scan
14
under analysis
22.Dec. arrived
13
another brick
14
under analysis
38
scanning
10
black ECC
28
scanning40
waiting
127
finished
5
black CS
status table in Japan
+61 (5.Jan. arrived)
e-showerdown platesingle stop
PLdown-stream up-stream
CC
NC
ALL
Vertex plate(CC,NC)
ALL
DVH
SB
SB : Scan Back LocationDVH : Direct Vertex Hunting
Vertex plate(SB,DVH)
down-stream up-streamPL
Vertex position distribution(all plate)
X(mm)
Y(mm)
Number of shower tracks/interaction
ALL
CC
NC
Mean = 3.4 tracks
N tracks
Angle distribution of shower tracks
x(rad)
y
Lock on decay search
xz-projection yz-projectionThis is “decay search sheet”.Vertex plate and down 2~3plate is most important plate(decay trigger plate).These tracks are corrected by less than IP<=200m from vertex point.First we check real stop then look for parent or 2nd vertex. All young people rock on decay search.
vertex point vertex point
Check track exist or not. (data and eyes)If stop then look for parent or partner between 1mm of lead
Summary
• We located 114 interactions out of 276 ECCs.
• Under analysis events for vertex confirm are “stop down plate”, “e-shower” and “single stop”.
• About stop down plate events, maybe scan-backed low-energy track.• About e-shower events, it should be scan up plates. • About single-stop events, it should be parent search and confirm real stop by eyes.
• We start decay search.• A decay candidate is found. But very preliminary.• This event stopped PL3, so now request down-stream ECC.• Up to next meeting we can show final result about this event.
Back up
Event : 235646940Brick : 41517Type : CC
Now request next brick
Under analysis events
Maybe partner track make large angle.So it needs large angle scanning (tan ~ 1 ).
Event : 234787942Brick : 151760Type : CC
Under analysis events : e-showerEvent : 234787942Brick : 151760Type : CC
Under analysis events : e-shower
2
stop plate1~2
7
single stop
5
e-shower
14
volume scanunder analysis