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崩壊の探索2004年年末発表会山中研 D3 坂下健
KL → π0νν̄ (1)
1
Physics Motivation• Searching for decay
• Clean measurement of Im(Vtd) ~ eta
• BR = 1.9 x 10-10 (eta)2 A4 X2
~ 3x10-11
• step-by-step approach
• E391a ~10-10
• J-Parc ~10-13
3
Introduction
! Searching for KL→!0"" decay" Flavor Changing Neutral Current
" Direct CP violation (#s =1)
" Clean measurement of Im(Vtd) ~ $
! The first dedicated experiment
! step-by-step approach
E391a(O(10-10)) # J-Parc(O(10-13))
KL → π0νν̄ (1)
1
E391a experiment• KEK 12GeV PS
• Experimental method
• detect 2 photon from pi0 decay + no extra photon
• Background source
• photon missing
• neutron interaction
• pencil beam
• detector
• hermetic photon detector
• high vacuum
9
E391a: Detection principle
! !0 from 2" with high PT
! pencil beam
" narrow beam – PT resolution
single !0 production (from halo neutron)
! detector system in high vacuum ~ 10-5 Pa
" minimize materials between decay region and detectors
! hermetic veto system
" including beamline
" double decay chamber
! reject KL decay in front of fiducial region
" high detection efficiency
! low detection threshold
Detector• detector in the
vacuum
• 4m R x 7m long
• 10-5 Pa
• hermetic photon detector
• neutral beam
• avr. P ~ 2GeV, n/K ~60
Analysis strategy• Key-1
• photon inefficiency
• Study 4g sample
γ
γ
KL
MBphoton veto
γ
γ
KL
γ
γ
γ
γ
KL
γ
γ
γ
γ
KL
γ
γ
γ
γ
A) KLπ0νν
B) KL2π0 , 2γ missing
C) KL2π0
D)KL3π0 , 2γ missing
CsIcalorimeter
Analysis strategy(2)
• Key-2
• neutron interaction
• halo neutron hit the detector
• Hints from GEANT MC
• neutron/gamma id
• shower shapen
CsI
Hadronicshower 2 clusters
4g analysis• Reconstruction of 4 gamma
• # of cluster equal to 4
• pi0 reconstruction with assuming pi0 mass
• select best chi2 pair
• Kinematics cut
• Pt2 < 1x10-3
• C.O.E < 5cm
γ1
γ2
γ3
γ4
z1
z2
2π0 momentum
Ptbeam direction
4g analysis• 4g invariant mass
• 3pi0 contamination : ~6%
• Data/MC
Klong mass
1 week data / 4!
0
50
100
150
200
250
300
0.4 0.425 0.45 0.475 0.5 0.525 0.55 0.575 0.6(GeV/c
2)
Data
MC 3"0
MC 2"0
M4!
(GeV/c2)
! o
f ev
ents
/0.5
MeV
Nsig
= 2189.5 events
Nbkg
= 135.2 events
1 week data / 4!
0
100
200
300
400
500
600
700
800
900
Klong mass
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6 0.65 0.7(GeV/c
2)
Data
/MC
Data
MC 3"0
MC 2"0
• What’s kind of events remaining in low invariant mass ?
• check MC 3pi0 1 or 2 fusion
# of hits in csi
Remaining events / MC k3pi0
0
10
20
30
40
50
60
70
80
0 1 2 3 4 5 6 7
ID
Entries
Mean
RMS
100
130
6.054
0.6084
Min. gamma distance
05
1015202530354045
0 10 20 30 40 50 60
ID
Entries
Mean
RMS
200
130
8.238
8.623
(cm)
Run 9005 Spill 0 Event 3623628Sun Oct 31 06:52:52 2004
0 1 2 3 4 5 6
7 8 9 10 11 12 13 14 15 16 17 18 19
20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53
54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74
75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143
144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168
169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193
194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220
221 222 223 224 225 226 227 228 229 230 231 232233234235236237238 239 240 241 242 243 244 245 246 247 248 249
250 251 252 253 254 255 256 257 258 259 260
261
262
263
264265 266 267 268 269 270 271 272 273 274 275
276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299
300 301 302 303 304 305 306 307 308 309 310311
312
313
314
315 316 317 318 319 320 321 322 323 324 325
326 327 328 329 330 331 332 333 334 335 336 337338339340341342343 344 345 346 347 348 349 350 351 352 353 354
355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381
382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431
432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456
457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500
501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521
522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540
541 542 543 544 545 546 547 548 549 550 551 552 553 554 555
556 557 558 559 560 561 562 563 564 565 566 567 568
569 570 571 572 573 574 575
0
1
2
3
4
56
7
8
9
10
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12
13
14
15
16
17 18
19
20
21
22
23
0
1
2
3
4
5
0
1
2
3
4
5
6
78
9
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11
12
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14
15
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18
19
20
21
22
2324
25
26
27
28
29
30
31
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33
34
35
01
23
45
0 1 2 3 4 5 6 7 8 9 1011 121314151617 181920212223 242526272829 303132333435
36
37
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41
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77
0
1
2
3
4
5
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7
0 1
2
3
4
56
7
8
9
10
11
12
13
14
15
1617
18
19
20
21 22
23
24
25
26
27
28
29
30
31
0
1
2
3
4
5
6
7 0 1
2
3
4
5
6
78
9
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11
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14
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64 65
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7172
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9697
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103 104
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0
1
2
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5
6789
10
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2223 24 25
26
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38394041
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53
5455 56 57
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61
62
63
01
0 1
2 3
0 1
2 3
4 5
0 1
2 3
4 5
6 7
8 9
0 1
2 3
4 5
6 7
8 9
CC04 CC05 CC06 CC07
-- Trig = 0x0011 : OnSpill, Nclus., -- Nclus=6
γγ
2g analysis
• 2g reconstruction
• # of cluster equal to 2
• Ei >= 200 MeV
• reconstuct pi0 vetex z with assuming pi0 mass
• apply photon veto
• understand remaining events using 1-week data sample
• still loose photon veto
• background study
• 3 region
1week data / 2! after photon veto
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
pt(
GeV
/c)
10
102
103
200 250 300 350 400 450 500 550 600zvtx(cm)
1 2 3
core neutron MC• Material in the front of CV
• core neutron hits the membrane(separator of vacuum)
1g/cm30.2mm-thick
n
CsICV
Low vacuum : ~10-1Pa
High vacuum : ~10-5Pa
• 2g data and MC sample
• w/o angle cut
• core neutron MC well reproduce data
pi0 pt
1 week data / 2!
1
10
102
103
104
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
(GeV/c)
MC 3"0
MC 2"0
MC !!
MC halo n
MC core n(CV)
MC core n(CC04)
pi0 energy
1 week data / 2!
1
10
102
103
104
0 0.5 1 1.5 2 2.5 3 3.5
(GeV)
MC 3"0
MC 2"0
MC !!
MC halo n
MC core n(CV)
MC core n(CC04)
pi0 recz
1 week data / 2!
1
10
102
103
104
150 200 250 300 350 400 450 500 550 600 650
(cm)
MC 3"0
MC 2"0
MC !!
MC halo n
MC core n(CV)
MC core n(CC04)
Zvtx
Epi0Pt
Check !!• Open the detector
• Actually the membrane drop to the beam core region
edge of the CV
• Another neutron background = Halo neutron
• In order to reject neutron background ....
• gamma/neutron id
• several variables associated to shower shape
• other variables
TDI =1
N
√√√√√ N∑i=1(Ei>1MeV )
(Ti − Tm)2 (1)
Tm =1
n
√√√√ n∑i=1(Ei>5MeV )
Ti (2)
RMS =
√√√√√√√n∑
i=1(Ei>5MeV )
Eir2i
Etot
Erat =Emax
Etot
Dist. =√
(x1 − x2)2 + (y1 + y2)2
Balance =Eγ1 − Eγ2
Eγ1 + Eγ2
1
TDI =1
N
√√√√√ N∑i=1(Ei>1MeV )
(Ti − Tm)2 (1)
Tm =1
n
√√√√ n∑i=1(Ei>5MeV )
Ti (2)
RMS =
√√√√√√√n∑
i=1(Ei>5MeV )
Eir2i
Etot
Erat =Emax
Etot
Dist. =√
(x1 − x2)2 + (y1 + y2)2
Balance =Eγ1 − Eγ2
Eγ1 + Eγ2
1
TDI =1
N
√√√√√ N∑i=1(Ei>1MeV )
(Ti − Tm)2 (1)
Tm =1
n
√√√√ n∑i=1(Ei>5MeV )
Ti (2)
RMS =
√√√√√√√n∑
i=1(Ei>5MeV )
Eir2i
Etot
Erat =Emax
Etot
Dist. =√
(x1 − x2)2 + (y1 + y2)2
Balance =Eγ1 − Eγ2
Eγ1 + Eγ2
1
TDI =1
N
√√√√√ N∑i=1(Ei>1MeV )
(Ti − Tm)2 (1)
Tm =1
n
√√√√ n∑i=1(Ei>5MeV )
Ti (2)
RMS =
√√√√√√√n∑
i=1(Ei>5MeV )
Eir2i
Etot
Erat =E1 + E2 + E3
Etot
Dist. =√
(x1 − x2)2 + (y1 + y2)2
Balance =Eγ1 − Eγ2
Eγ1 + Eγ2
1
TDI =1
N
√√√√√ N∑i=1(Ei>1MeV )
(Ti − Tm)2 (1)
Tm =1
n
√√√√ n∑i=1(Ei>5MeV )
Ti (2)
RMS =
√√√√√√√n∑
i=1(Ei>5MeV )
Eir2i
Etot
Erat =E1 + E2 + E3
Etot
Dist. =√
(xγ1 − xγ2)2 + (yγ1 + yγ2)2
Balance =Eγ1 − Eγ2
Eγ1 + Eγ2
1
TDI =1
N
√√√√√ N∑i=1(Ei>1MeV )
(Ti − Tm)2 (1)
Tm =1
n
√√√√ n∑i=1(Ei>5MeV )
Ti (2)
RMS =
√√√√√√√n∑
i=1(Ei>5MeV )
Eir2i
Etot
Erat =E1 + E2 + E3
Etot
Dist. =√
(xγ1 − xγ2)2 + (yγ1 + yγ2)2
Balance =Eγ1 − Eγ2
Eγ1 + Eγ2
1
- Time dispersion
- Sower shape (RMS, Energy ratio)
- 2g distance, energy balance
• TDI and Erat
• check by MC
• distribution of data
• 6g data = pure gamma sample
• N1 clust = neutron sample (?)
• detail study in progress
TDI vs Erat
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
1
10
102
ID 2010
ENTRIES 6770
0.00 0.00 0.00
0.00 0.677E+04 0.00
0.00 0.00 0.00
2004/11/23 23.52
gamma w/o an 100mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
10
102
103
ID 2010
ENTRIES 27040
0.00 0.00 0.00
0.00 0.270E+05 0.00
0.00 0.00 0.00
gamma w/o an 200mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
10
102
103
ID 2010
ENTRIES 48387
0.00 0.00 0.00
0.00 0.484E+05 0.00
0.00 0.00 0.00
gamma w/o an 500mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
10
102
103
ID 2010
ENTRIES 22471
0.00 0.00 0.00
0.00 0.225E+05 0.00
0.00 0.00 0.00
gamma w/ an 100mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
10
102
103
ID 2010
ENTRIES 67925
0.00 0.00 0.00
0.00 0.679E+05 0.00
0.00 0.00 0.00
gamma w/ an 200mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
10
102
103
ID 2010
ENTRIES 95586
0.00 0.00 0.00
0.00 0.956E+05 0.00
0.00 0.00 0.00
gamma w/ an 500mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
10-1
1
10ID 2010
ENTRIES 11143
0.00 0.00 0.00
0.00 0.401E+04 0.713E+04
0.00 0.00 0.00
neutron 500mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
1
10
102
ID 2010
ENTRIES 68081
0.00 0.00 0.00
0.00 0.386E+05 0.295E+05
0.00 0.00 0.00
neutron 1000mev
0
0.2
0.4
0.6
0.8
1
0 0.2 0.4
10
102
103
ID 2010
ENTRIES 270404
0.00 0.00 0.00
0.00 0.193E+06 0.774E+05
0.00 0.00 0.00
neutron 2000mev
6!
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 1 2 3 4 5 6 7 8 9 10
102
103
104
ID 1126
ENTRIES 342782
0.00 0.00 0.00
0.00 0.342E+06 847.
0.00 0.00 0.00
gamma tdi vs erat TDI
Era
t
N1 trigger
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
0 1 2 3 4 5 6 7 8 9 10
1
10
102
ID 1012
ENTRIES 2534
0.00 0.00 0.00
0.00 0.245E+04 85.0
0.00 0.00 0.00
gamma tdi vs erat tdi
era
t
(MC)
(Data)
• rough cut definition using 2g data (not optimize)
• RMS < 7.0
• TDI < 3.0
• Erat > 0.9 (only lower thr.)
gamma tdi
Region 1,2,3 / data
1
10
102
103
0 1 2 3 4 5 6 7 8 9 10
200. ! z ! 300.
300. ! z ! 500.
500. ! z ! 600.
gamma rms
Region 1,2,3 / data
1
10
102
103
0 2 4 6 8 10 12 14
200. ! z ! 300.
300. ! z ! 500.
500. ! z ! 600.
gamma erat
Region 1,2,3 / data
1
10
102
103
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
200. ! z ! 300.
300. ! z ! 500.
500. ! z ! 600.
RMS
EratTDI
• energy balance < 0.5
• distance >= 50 cm
• tighter than previous analysis
• reject many events in the region-3
gamma distance
Region 1,2,3 / data
1
10
102
103
0 20 40 60 80 100 120 140 160 180
(cm)
200. ! z ! 300.
300. ! z ! 500.
500. ! z ! 600.
gamma energy balance
Region 1,2,3 / data
1
10
102
103
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
(GeV/GeV)
200. ! z ! 300.
300. ! z ! 500.
500. ! z ! 600.Ebalance
Distance
• Signal MC need to check by control sample
Ebalance Distance
gamma energy balance
Signal MC
10
102
103
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
(GeV/GeV) gamma distance
Signal MC
1
10
102
103
0 20 40 60 80 100 120 140 160 180
(cm)
gamma rms
Signal MC
1
10
102
103
104
0 2 4 6 8 10 12 14
gamma erat
Signal MC
1
10
102
103
104
0.5 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
(GeV/GeV)
RMS Erat
Final plot108
evts30 evts(all pt)
58 evts
1week data / 2! w/ all cuts
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
200 250 300 350 400 450 500 550 600
zvtx(cm)
pt(
GeV
/c)
1week data / 2! w/ all cuts
1
10
150 200 250 300 350 400 450 500 550 600 650
zvtx(cm)
1
10
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
pt(GeV/c)
Summary • 4g & 2g analysis
• Fusion events appear
• Current major background
• halo neutron hit into CC02
• tail from region-1(halo neutron) and region-3(core neutron)
• direct neutron hit into CsI
• some events in the region-2, but these events can be killed by shower shape cut
• understand the events in the region-2, now in progress
backup slide
Gamma maxcsize
1 week data / 4!
0
100
200
300
400
500
600
700
800
0 2.5 5 7.5 10 12.5 15 17.5 20 22.5 25
Data
MC 3"0
MC 2"0
Gamma minfuse
1 week data / 4!
0
250
500
750
1000
1250
1500
1750
2000
2250
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Data
MC 3"0
MC 2"0
Gamma maxcsrat
1 week data / 4!
0
100
200
300
400
500
600
0 25 50 75 100 125 150 175 200 225 250
Data
MC 3"0
MC 2"0
• Check several variables according to shower shape
• Can we reject “fusion event” ?
0:Fusion, 1:Not Fusion
Min( neuralnet fusion flag )
Max( Etot/csize )
Max( csize )
(MeV)
• Events in the region-1
• there are small deposited energy
• if we apply low threshold, 0.2 - 0.5 MeV, we can reduce the events in the region-1
• Events in the region-3
• low energy pi0 which generated by core neutron hit
• higher threshold reduce signal acceptance
EmaxCC02 vs recz / data
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
200 250 300 350 400 450 500 550 600
ID 5029
ENTRIES 237
0.00 0.00 0.00
0.00 237. 0.00
0.00 0.00 0.00
pi0recz vs Emax CC02 (cm)
(MeV
)
small deposited energy !!
gamma shapeTDI vs RMS
0
2
4
6
8
10
0 0.2 0.4
1
10
102
ID 2007
ENTRIES 6770
0.00 1.00 0.00
0.00 0.677E+04 0.00
0.00 0.00 0.00
2004/11/23 23.52
gamma w/o an 100mev
0
2
4
6
8
10
0 0.2 0.4
1
10
102
ID 2007
ENTRIES 27040
0.00 0.00 0.00
0.00 0.270E+05 0.00
0.00 0.00 0.00
gamma w/o an 200mev
0
2
4
6
8
10
0 0.2 0.4
10
102
103
ID 2007
ENTRIES 48387
0.00 0.00 0.00
0.00 0.484E+05 0.00
0.00 0.00 0.00
gamma w/o an 500mev
0
2
4
6
8
10
0 0.2 0.4
1
10
102
ID 2007
ENTRIES 22471
0.00 70.0 0.00
0.00 0.224E+05 0.00
0.00 0.00 0.00
gamma w/ an 100mev
0
2
4
6
8
10
0 0.2 0.41
10
102
ID 2007
ENTRIES 67925
0.00 45.0 0.00
0.00 0.679E+05 0.00
0.00 0.00 0.00
gamma w/ an 200mev
0
2
4
6
8
10
0 0.2 0.4
10
102
103ID 2007
ENTRIES 95586
0.00 6.00 0.00
0.00 0.956E+05 0.00
0.00 0.00 0.00
gamma w/ an 500mev
0
2
4
6
8
10
0 0.2 0.4
10-1
1
10ID 2007
ENTRIES 11143
0.00 19.0 86.0
0.00 0.399E+04 0.704E+04
0.00 0.00 0.00
neutron 500mev
0
2
4
6
8
10
0 0.2 0.4
1
10
102ID 2007
ENTRIES 68081
0.00 331. 371.
0.00 0.382E+05 0.291E+05
0.00 0.00 0.00
neutron 1000mev
0
2
4
6
8
10
0 0.2 0.4
10
102
103
ID 2007
ENTRIES 270404
0.00 978. 573.
0.00 0.192E+06 0.769E+05
0.00 0.00 0.00
neutron 2000mev
EDI vs RMS
0
2
4
6
8
10
0 0.5 1
1
10
102
ID 2006
ENTRIES 6770
0.00 1.00 0.00
0.00 0.677E+04 0.00
0.00 0.00 0.00
2004/11/23 23.52
gamma w/o an 100mev
0
2
4
6
8
10
0 0.5 1
1
10
102
ID 2006
ENTRIES 27040
0.00 0.00 0.00
0.00 0.270E+05 0.00
0.00 0.00 0.00
gamma w/o an 200mev
0
2
4
6
8
10
0 0.5 1
10
102
103
ID 2006
ENTRIES 48387
0.00 0.00 0.00
0.00 0.484E+05 0.00
0.00 0.00 0.00
gamma w/o an 500mev
0
2
4
6
8
10
0 0.5 1
1
10
102
ID 2006
ENTRIES 22471
0.00 70.0 0.00
0.00 0.224E+05 0.00
0.00 0.00 0.00
gamma w/ an 100mev
0
2
4
6
8
10
0 0.5 11
10
102
ID 2006
ENTRIES 67925
0.00 45.0 0.00
0.00 0.679E+05 0.00
0.00 0.00 0.00
gamma w/ an 200mev
0
2
4
6
8
10
0 0.5 1
10
102
103
ID 2006
ENTRIES 95586
0.00 6.00 0.00
0.00 0.956E+05 0.00
0.00 0.00 0.00
gamma w/ an 500mev
0
2
4
6
8
10
0 0.5 110
-1
1
10
ID 2006
ENTRIES 11143
0.00 105. 0.00
0.00 0.110E+05 0.00
0.00 0.00 0.00
neutron 500mev
0
2
4
6
8
10
0 0.5 1
1
10
102
ID 2006
ENTRIES 68081
0.00 702. 0.00
0.00 0.674E+05 0.00
0.00 0.00 0.00
neutron 1000mev
0
2
4
6
8
10
0 0.5 1
10
102
103
ID 2006
ENTRIES 270404
0.00 0.155E+04 0.00
0.00 0.269E+06 0.00
0.00 0.00 0.00
neutron 2000mev
gamma shape6!
0
2
4
6
8
10
12
14
16
18
20
0 1 2 3 4 5 6 7 8 9 10
10
102
103
ID 1124
ENTRIES 342782
0.00 1.00 0.00
0.00 0.342E+06 847.
0.00 0.00 0.00
gamma tdi vs rms TDI
RM
S
N1 trigger
0
2
4
6
8
10
12
14
16
18
20
0 1 2 3 4 5 6 7 8 9 10
10-1
1
10
ID 1010
ENTRIES 2534
0.00 0.00 0.00
0.00 0.245E+04 85.0
0.00 0.00 0.00
gamma tdi vs rms tdi
rms
