gyaku(inverse) data base y.nonoyama nagoya univ. new idea of emulsion track link to sft trigger in...
Post on 20-Dec-2015
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Gyaku(Inverse) Data Base
Y.Nonoyama
Nagoya Univ.
New idea of Emulsion track link to SFT trigger in PEANUT
Principle of link counter
• Traditional : counter(SFT) → Emulsion– Emulsion track(scan back) linked using counter
prediction (CHORUS, OPERA CClike..)
• New idea : Emulsion → SFT– Emulsion track match SFT trigger inversely– Look for matching trigger with Emulsion track– This method called “Gyaku Data Base”
Purpose
• Counter bias(track reconstructed efficiency..) can be free.
• Emulsion track can have time stamp.
• Non bias neutrino physics.– Neutrino flux
– e component
beam study (NuMI, J-PARC..)
Gyaku Data Base method
Emulsion track
match
no match
allowance
match
• Emulsion track extend down stream.• SFT hits on the track ??
Allowance : +- (1mm + 3mrad z axis)SFT plane alignment + angle measurement error
(and scattering error)
match
SFT = 10layer (x,y-projection), 2layer (u-projection)
Scanned doublet and try this method
Scanned doublet
Exposure period (day)
SFT Trigger
Position
in SFT
Scan area
(cm2)
# of tracks
BL118 95.36 2.0x106 122 4(2x2) 104
BL040 12.93 4.3x105 222 56(7x8)
903(1172)
BL052 20.75 6.6x105 322 56(7x8)
866
BL064 24.87 7.5x105 422 56(7x8)
1338
BF021 70.58 1.8x106 332 56(7x8)
2188
Tried Gyaku Data Base method
Show this
BL040
BL040 12.93 4.3x105 222 56 903(1172)
Estimation of track origin (scanned area = 56cm2 ) Rock muon : 156xx= 560 interaction : 3-456/125xx= 15-20 Cosmic ray(for alignment) : 0
(BA+de-pack) : 1hour560.2(|<0.4) = 650
MINOS observed value Rock muon event late : 1/cm2/day(4.0x104trigger) interaction event late : 3-4/brick/day(4.0x104trigger)
Scanned doublet
Exposure period (day)
SFT Trigger
Position
in SFT
Scan area
(cm2)
# of tracks
903( 269 out of 1172 tracks are different alignment )
Demonstration - 1
• Show Gyaku Data Base– 903 track matched with 4.4x105 trigger
• Selection 1– x match layer >=2 y match layer >= 2
MEMO
Content of SFT trigger
•NULL(no hits) 80%
•Rock muon 10%
• interaction 0.1%
# of matched trigger per track
3tracks doesn’t match any triggerAlmost Emulsion track matched5 triggerMaximam 13trigger
# of matched track per trigger
Matched trigger is almost over lappingTotal matched trigger is 912 trigger
Result
• Rock muon event : 156
• Neutrino interaction event : 165(30trigger)
• No match any trigger : 582– Cosmic ray, low energy electron, scattering trac
k..
Summary
• Now, I polish this method.– Program, selection parameter..
• Gyaku Data Base method will work.
• So non-bias neutrino physics is possible.
• And we have 2 future plan to use this method.
Future plan
• PEANUT RUN2– NuMI beam study.– e contaminate– Change target mass consider beam energy.– We plan to start early next year.
• J-PARC– It’s same purpose of PEANUT RUN2– Set emulsion on T2K near detector (280m)
located.
TRIGGER POS Scan Area
Track*1 Rock Int CR*4
BL118 2.0x106 122 4 104 200 150(5)
BL040 4.3x105 222 56 1172*2 602 30(13)
BL052 6.6x105 322 56 866 924 48(21)
BL064 7.5x105 422 56 1338 1053 54(24)
BF021 1.8x106 332 56 2188 2520 95(42)*3
MINOS 実測値 Rock-Muon : 1 / cm^2 / day Neutrino-Int : 3~4 / ECC / day
PEANUT 検出器 Rock-Muon : 1 / cm^2 / day A Neutrino-Int : 3~4 / ECC / day B
*1 宇宙線込み *2 903+269(cosmic)*3 鉄ブリック ( 鉛 x0.7)*4 宇宙線 (BAM+ 解体 ) 10/cm^2