NetScan for BL118

PEANUT meeting @ Fermilab

22-23/Jan/2007

Possibility of non-bias analysis

• Naples already did full scanning for one brick.– Giovanni’s report

• Pilot analysis of BL118 NetScan is started.– 5x5 25cm2 area is scanned by SUTS

• Today I report first 21 plate data.

• We used base track for NetScan framework– For the first attempt.– How much we can reduce scanning power is next

subject.

BL118 short history• Exposure

– Start : 2005/11/25 21:24:08(GMT)– End : 2006/02/25 23:02:59(GMT) 92days– Trig : 2506482 (Beam stop period was there)

• ~250 events are expected.

• 2 times airplane flight– Nagoya ->Fermilab– Fermilab -> Nagoya -> develop

1

2

3

4

5

53

54

55

56

57

1(57 in transportation)

2(56 in transportation)

Lead

3(55 in transportation)

Lead

4(54 in transportation)

55(3 in transportation)

Lead

54(4 in transportation)

Lead

53(5 in transportation)

No flip

Numberingon plate is 1

Bea

m d

irec

tion

Numberingon plate is 54On upstream

Brick structure

NetScan flow• SUTS scanning for both side of film• Base track reconstruction• Align in transportation order

– Reduce tracks reconstructed in transportation order from data set to clean up.(Virtual erasing)

– For BL118, there is two transportation alignment.

• Align in exposure order– ECFSAL is used (Same as DONUT)– ECVTXA is used for vertex hunting.

SUTS scanning and base track• Details are described in Morishima’s talk

• 5x5 25cm2 is scanned– There was some mistakes in data taking– Fully overlapped 4x4cm2 is used for quality check

• Base track is formed by SUTS standard software.– I’ve applied too tight base track selection for first trial

• 2 sigma Base track to micro track angular agreement was required for both X and Y for two emulsion layer. This means maximum tracking efficiency will be 83%.

• We wanted to see pure PH distribution for future analysis. So I did not cut by PH. (volume <= 2 is reduced)

Sample of base track selection• This is plotting base tracks

to micro track slope difference.

• But only plotting sum of PH larger than 25.– Minimum PH sum is 13 for

this PL05.

• 2 sigma cut was applied for projected angular difference.– Since Plate 7, also detailed

shrinkage error correction is done for selection.For this PL5, 416,733 out of

19,012,417 base track was selected

Virtual erasing• Align in transportation order to reconstruct tra

cks while airplane flight.– We could find two transportation alignment as exp

ected.

• Nagoya -> Fermilab– 306,248 out of 4,779,566 for 21plates– Observed track density ~ 600/cm2

• Fermilab -> Nagoya– 952,478 out of 4,779,566 for 21plates– Observed track density ~ 2,000/cm2

Nagoya->Fermilab Fermilab->Nagoya

Angular distribution

Nagoya->Fermilab Fermilab->Nagoya

Pulse Height distribution

Nagoya->Fermilab Fermilab->Nagoya

Efficiency as a function of slope

Nagoya->Fermilab Fermilab->Nagoya

Efficiency as a function of plate

Nagoya->Fermilab Fermilab->Nagoya

Overall resolution

8.5mrad 10.7mrad 10.9mrad 14.3mrad

Preliminary: Angle resolution is compared to angle obtained by position of first and last plate

4.7m 4.5m 4.7m 4.7m

Alignment in exposure• Virtual erasing is applied

– 3,530,479 base track remains for 21 plate.– Right table shows number of base tracks for

each plate.– Still large amount of junk base track is there.

• ECFSAL– 139,777 track (nseg>=2) are reconstructed.

• 128,015(2seg), 8,294 track (3seg)• 3,468 track (nseg>=4)

– Too large amount of nseg<=3• To reduce junk track, I applied 30mrad angular mu

ch for nseg<=3 tracks• Reduced to 37,125(2seg), 1,475(3seg)

66394 f001.001 100730 f002.001 335458 f003.001 232095 f004.001 286247 f005.001 404625 f006.001 314017 f007.001 172725 f008.001 110706 f009.001 100512 f010.001 85604 f011.001 106800 f012.001 116955 f013.001 137667 f014.001 119846 f015.001 142189 f016.001 127642 f017.001 135839 f018.001 141562 f019.001 126336 f020.001 166530 f021.0013530479 total

4 segment or more track

2 segment track 3 segment track

Efficiency check• ECFSAL reconstructed tracks nseg>=4 is used.

– Fully overlapped scanning area 4x4 is used.– Start and end plate is not used for eff check.

– Plate 1 and 21 eff. Can not check

check

6.3mrad 6.4mrad

Note:angle is compared with angle obtained by position of start and end.

5.4m 6.0m

Eff. As a function of slope Eff. As a function of plate

PH distribution Track density

Preliminary vertex hunting• ECVTXA is used for preliminary vertex hunting.

11 6 0 -56561.9 76531.2 -20969.1

151 5941653 9 141 7118239 5 1.8 -7.2 -46.6 -1149.9 7.03 0.1931 141 7070732 7 151 5941653 9 -7.1 -12.1 27.9 -1075.3 12.83 0.1179 151 5941653 9 151 5981499 7 -3.2 4.7 -26.7 -1129.9 0.98 0.2085 141 7070732 7 151 5981482 6 1.7 -7.2 -0.2 -1103.5 13.39 0.2461 151 5941653 9 151 5981482 6 -2.2 5.6 -32.9 -1136.2 1.99 0.1440 151 5981482 6 151 5981499 7 -1.9 4.5 -6.6 -1109.9 0.05 0.0767 141 7118239 5 151 5981482 6 -1.0 -5.3 53.4 -1049.9 8.63 0.0695 151 5979255 6 151 5981499 7 -5.0 2.3 -4.3 -1107.6 7.78 0.4589 151 5979255 6 151 5981482 6 -4.7 1.7 -2.2 -1105.5 7.52 0.4606 151 5941653 9 151 5979255 6 -7.2 1.4 -4.3 -1107.5 3.24 0.5722 141 7070732 7 141 7118239 5 4.5 -14.9 -35.0 -2370.3 8.35 0.3018 151 5941653 9 9 6 0 -56719.7 76458.9 -19865.9 -0.1384 -0.0688 -1103.2 6.01 0.0056 141 7118239 5 8 7 0 -56435.4 76458.8 -18633.8 0.0521 -0.0259 -2335.4 15.32 0.0052 141 7070732 7 8 7 0 -57120.7 76205.2 -18633.8 -0.2309 -0.1333 -2335.4 23.83 0.0036 151 5981499 7 7 6 2 -56485.4 76495.1 -19865.9 0.0633 -0.0351 -1103.2 6.57 0.0065 151 5981482 6 7 6 2 -56555.2 76446.0 -19865.9 0.0066 -0.0814 -1103.2 4.56 0.0056 151 5979255 6 7 3 8 -56189.2 76008.7 -19865.9 0.3437 -0.4720 -1103.2 7.64 0.0010 3 3 0 -68817.8 47444.7 -22457.2 161 5359881 14 151 2935076 4 1.9 -3.9 2.5 -1388.3 4.33 0.2893 161 5359426 7 151 2935076 4 2.2 -9.6 -25.2 -1416.0 14.66 0.0634 161 5359881 14 161 5359426 7 -0.4 0.7 -10.7 -1401.6 0.21 0.2969 161 5359881 14 16 5 0 -68562.0 47525.6 -21066.4 0.1840 0.0556 -1390.8 3.70 0.0005 151 2935076 4 4 6 11 -69042.4 47305.5 -19865.9 -0.0876 -0.0519 -2591.3 5.53 0.0008 161 5359426 7 10 5 6 -68908.7 47288.0 -21066.4 -0.0652 -0.1134 -1390.8 0.44 0.0010

Another 23 two track vertex IP<20 is exist.Local alignment is not done.

Summary• Apart from OPERA, NetScan is good method

to perform non-bias neutrino interaction analysis.– Especially for electron neutrino location.

• NetScan with SUTS is feasible.– But, currently noise track density is bit too high to

do clean analysis.SUTS scanning should be well tuned.

– Also, cut applied for base track is too tight.Should be revised.

Outlook• Before OPERA run, SUTS can be used

for PEANUT analysis(half year)– While in this half year, number of SUTS will

increase to 5.– At least, four bricks which exposed more

than two month can be scanned by NetScan.(~1,000 neutrino interactions)