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 )

Position of BL040 (222)

x-projection

y-projection

u-projection

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

Demonstration - 2

• I selected by eye-check– Rock muon event– Neutrino interaction event

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.

Back up

PL3 scan result

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

SFT plane allignment