SciBooNE (FNAL E954)

SciBardetector at FNAL Booster
Neutrino Experiment
Boo
SciContents•Introduction•Physics cases•Schedule•Summary

K. Hiraide (Kyoto Univ.)
July 6th, 2006
第19回「宇宙ニュートリノ」研究会
1

Highlights
Booster Neutrino Beam

SciBarDecay region

MiniBooNEDetector

50 m• Non quasi-elastic ν interactions•Antineutrinos• Currently unexplored physics territory•

MiniBooNE near detector• Independent measurement for
confirmation

440 m
Flux (normalized by area)•100 mPrecise knowledge of σs is necessary forT2K and the other experiments

T2K

SciBooNE

K2K
12Eν (GeV)

2

Impact of Neutrino Cross sections onoscillation measurements (1)(/50MeV/22.5kt/5yr)

T2K νμÆνμ precision measurement
ALLCHAN1001223.

T2K
νμ events
w/ osci.

75
50Signal: CC-QE (ν+n→μ+p)
Energy Reconstruction from μ kinematics

Background: Mainly CC-1π± (ν+N→μ+π+N’)
Cross section with the visibility of π

25000.5

1

1.52recEν (GeV)δ(sin2 2θ)δ(Δm2)

νμ disappearance
measurement error (90%CL)
stat. only
δ(nQE/QE)= 5%
δ(nQE/QE)=20%
3

Impact of Neutrino Cross sections onoscillation measurements (2)T2K νμÆνe searchsin2 2θ13 sensitivity
as a function of time(sin2 2θ13=0.1)

Signal: CC-QE (ν+n→e+p)
Background
Beam νe
NCπ0
Cross section as a function of the momentum

Anti-ν for CP violation study

sin2 2θ13 sensitivity

T2K
νe events- stat. only
- δBG=10%- δBG=20%

10-212

3

4

5Exposure /(22.5kt x yr)
4Unexplored Areas of Neutrino Physicsσν in this E range of interest:

QEDIS1π• Data from old experiments(1970~1980)• Low statistics• Systematic Uncertainties• Nuclear effects(π/p/n absorption/scattering,shadowing, low Q2 region)• Not well-modeled• New data from MiniBooNE& K2K revealing surprises

MINOS, NuMI
K2K, NOvAMiniBooNE, T2K, SciBooNE
Super-K atmospheric ν• More data at 1GeV with finegrained resolution will
advance Neutrino Physics.
5SciBooNE collaboration••••••••••••••

BarcelonaCincinnati
Colorado
ColumbiaFNAL
ICRRKEKKyoto
LANL
LSU
RomeStratton Mtn
Tokyo Tech.
Valencia

F. Sanchez, J. Alcaraz, S. Andringa, X. Espinal, G. Jover, T. Lux, F. Nova, A. Y. Rodriguez

R. Johnson
E.D. Zimmerman, M. Wilking
J.M. Conrad, M.H. Shaevitz, A.A. Aguilar-Arevalo, K.B.M. Mahn, J. Monroe, G.P. Zeller

S.J. Brice, B.C. Brown, D.A. Finley, T. Kobilarcik, A.D. Russell, R. Stefanski
Y. Hayato
T. Ishii, M. Tanaka
T. Nakaya, M. Yokoyama, H. Tanaka, K. Hiraide, Y. Kurimoto,Y. Nakajima, M. Taguchi, K. Matsuoka, Y. Kurosawa
R. Van de Water, W.C. Louis,
M.O. Wascko, W. Metcalf,
L. Ludovici, U. Dore, P. F. Loverre, C. Mariani
L. Bugel

14 institutes~60 people

T. Shibata, Y. Miyachi, H. Takei
J. J. Gomez-Cadenas, A. Cervera, M. Sorel, A. Tornero, J. Catala,P. Novella, E. Couce, J. Martin-Albo6

Detector Components•SciBar Detector• Full active neutrino target• Tracking• From KEK, JapanM• Electron Calorimeter• νe / π0 identification• From KEK, Japan• European collaborators have
responsibility•

Muon Range Detector (MRD)• Muon identification• Momentum measurement• Will be built at FNALECRDSciBarν beam7

eretrimloca

Extruded
Extruded scintillators with WLS
scintillator
fiber readout(15t)• Scintillators are the neutrino target• 2.5 x 1.3 x 300 cm3 cell• ~15000 channels
Multi-anode
PMT (64 ch.)• Identify short tracks (>8cm)• Distinguish a proton from a pion bydE/dx• Total 15 tonsÎHigh track finding efficiency (>99%)ÎClear identification of ν interaction
process
Wave-length

EM

SciBar Detector
•3m3m

ν

1.7m

shifting fiber
8Muon Range Detector (MRD)
Iron plate- 305 x 247 x 5cm- 13 layers
Scintillator plane- Alternating horizontal
and vertical planes- 366 channels

Aacceptance
(E )
Muon
acceptancefor CC events
ν

10.8

0.6

Measure momentum by range
up to 1.2GeV/c muons

0.4

0.2

00

MRD stop
0.5

11.5

22.5

3Eν (GeV)

9SciBooNE Physics• Propose 1year run (2x1020 protons on target)• Neutrino run (0.5x1020 POT)
# of interactions in FV+• CC-1π cross section
νμ ~78,000
νe ~ 700• NC-1π0 cross section• Intrinsic νe contamination• Anti-neutrino run (1.5x1020 POT)• CC-QE cross section# of interactions in FV• neutrino BG contamination
νμ ~40,000
νμ ~22,000• CC-coherent π cross section10CC-1π+ measurement• Non-QE events: dominant background forνμ disappearance• At BNB energies, non-QE BG dominated by
CC1π+• T2K needs to reduce uncertainty of nonQE/QE
to ~5%
δ(sin2 2θ)πpμδ(Δm2)

νμ disappearance
measurement error(90%CL)stat. only
δ(nQE/QE)= 5%
δ(nQE/QE)=20%
11

CC-1π+ measurementμμpπμπClear event-by-event
final-state tagging!

CC-1π+ signature:
2 MIP-like tracks
Vertex activity cuts:
separate ν+pÆμ−pπ+from ν+nÆμ+nπ+pSensitive to thenuclear effect

Expect ~1,400 CC-1π+ events after cuts

Statistics and systematics
Sufficient for ~5% measurement12NC-1π0 measurement• Dominant background to νe appearance in any
experiment2-ring merged to 1-ringin Cherenkov detectorγπ0γ

2 tracks visible inSciBar evt display

200~700MeV/c π0ssin2 2θ13 sensitivity• Overlapping rings, or back-to-back decay• T2K needs NC1π0 cross section to be known at 10% level- stat. only
- δBG=10%- δBG=20%

10-2

12

3

45Exposure /(22.5kt x yr)
13

NC-1π0 measurementσ(ν+pÆν+p+π0)
Background forT2K νe search
SciBar at BooNE
Projected SciBar at K2K
Projected SciBar at BooNE

SciBar at K2K

10% measurement

Map out energy dependence at point where crosssection turns over, crucial for T2K NC1π0 BGs

14

Antineutrino CCQE measurement
Physics motivation• Important for T2K phase-II• CP violation search• Free proton scattering:check of nuclear model
No data

CC-QE: νμ + p Æ μ+ + n

νμμ+ (pμ , θμ)n

• Detected as a 1-track
event in SciBar• Excellent ν energy,
Q2 resolution

Expect ~9,000 CCQE events after cuts, 80% purity

15

BNB Wrong Sign Backgrounds

ν+p→μ++nν QE: ~80%
ν BG: ~7%

ν+n→μ-+pν QE: ~80%

~7.5% stat. err. in 2 track sample in 4 bins (0-1.5 GeV)

16

Current Status
2005/06:
LOI submitted
2005/10:
FNAL Director’s Review
2005/12:FNAL PAC - Proposal was approved!

2005/07
Background test
@FNAL

2005/11
SciBar disassembly@KEK
2006/06
SciBar left KEK

Detector hall design

MRD design / test17

Schedule
2006
Jun. Jul.
Jun. 2006 Jul. 2006

Task name
Scintillator shipping
SB component shipping
Fiber shipping
CDF hall preparation
Procurement modules, cables…
PMT, Elec, Fiber tests
Build trigger logic (NIM)
Civil construction
Structure design/drafting
Structure construction
SB/EC reassembly @CDF hallFiber/PMT installation @CDF hallLight leak/CR/DAQ test @CDF
Prepare Detector Installation
Detector Installation @SciBooNE
Commissioning @SciBooNE hall
SB, EC, MRD DAQ sync. Test
Beam runAug.

Aug. 2006

Sep.

Sep. 2006

Oct.

Oct. 2006

2007
Nov. Dec. Jan. Feb.
Nov. 2006 Dec. 2006 Jan. 2007 Feb. 2007

shipping

Detector hall construction
Detector assemblyat CDF hallInstallation
Commissioning

Now

Beam run(1 year)18

Summary• SciBooNE is an experiment to study neutrinointeractions very precisely using SciBar detector andFNAL Booster neutrino beam
• Proposal was approved in Dec. 2005
• SciBar detector was shipped in the last month and it’son the way to FNAL
• Construction is scheduled to be started in thissummer• Commissioning is expected to start in this year
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Backup slides20CC-1π+ measurement
π+ detection efficiency
as a function of Pπ+
Emitted π+

CC-1π+ signature:
2-track, both are MIP-like

Selection criteria#(CC-1π+) Purity[events]

Efficiency

Generated in FV

13,892-------100%

CC inclusive sample

8,977

24.1%

64.6%

# of tracks =22,705

32.6%

19.5%

2nd track = MIP-like

1,355

46.8%

9.8%

π+ efficiency(SciBar+EC+MRD)

Additional vertex activity can separate
ν+pÆμ+p+π+ from ν+nÆμ+n+π+Statistics will allow a 5%
measurement21NC-1π0 measurement
π0 detection efficiency
as a function of Pπ0

NC-1π0 event display

Emitted π0• Good efficiency forhigh-momentum π0π0s are detected
as two shower-liketracks in SciBar

π0 efficiency• Reconstructed π0~800events
Additional vertex
activity can separate
ν+pÆν+p+π0from
ν+nÆν+n+π022

CC-coherent π measurement• CC-coherent π: ν+AÆμ+A+π• Physics motivation• SciBar observed noCC-coherent π productionin the K2K beam
PRL 95, 252301(2005)

σ (CC − Coh π )< 0.60 × 10 − 2 @ 90%CL
σ (ν μ CC )• It will be a good check by using both neutrino and antineutrino beam23

CC-coherent π measurement (cont’d)Rec. Q2 distribution of final sample
Anti-neutrino Run(1.5x1020POT)

Neutrino Run(0.5x1020POT)
300

20000.1

Rec. Q2 (GeV/c)2#(coherent π)~160events
Efficiency = 0.11
Purity= 0.4400.1

Rec. Q2 (GeV/c)2#(coherent π)~240events
Efficiency = 0.11
Purity= 0.49We can measure in both neutrino
and anti-neutrino beam24

Expected neutrino flux spectra
Neutrino Run

Anti-neutrino Run25

Expected νμ flux x σ spectra
At z=100m

At ground level

Same <Eν>

Very low
EnergySeveral detector ylocations: A~Hstatistics~1/10

Ground level
DCEFBHcolor means <Eν>
A100m

G200mz26

Expected # of interactions
Expected Proton Delivery Rate: (1~2)x1020 POT/yearÎ Assumed 1-year data taking at MiniBooNE beamline
Anti-neutrino Run(1.5x1020POT)

Flux x σ (a.u.)

Flux x σ (a.u.)

Neutrino Run(0.5x1020POT)

νμ: ~78,000 int.
νe: ~700 int.

Neutrino
B.G. (~35%)

νμ: ~40,000 int.
νμ: ~22,000 int.

27

Neutrino mode (0.5x1020POT)# of νμ events
CC QE

32,238CC resonant 1π+

14,317

NC elastic

13,976

CC multi-π4,743

NC resonant 1π03,814

CC resonant 1π03,047

NC resonant 1π+/-

2,405

NC multi-π

1,650

CC coherent 1π+1,466

NC coherent 1π0741

Total

78,39728

Antineutrino mode (1.5x1020POT)# of νμ-bar events (RS)# of νμ events (WS)CC QE

18,214

7,674

NC elastic

7,410

3,446

CC resonant 1π-

4,2520CC resonant 1π+04,363

CC coherent 1π-2,1050CC coherent 1π+0384

NC resonant 1π02,025

1,104

CC multi-π

1,550

2,309

NC resonant 1π+/-1,225738

CC resonant 1π01,097898

NC coherent 1π01,078

210

NC multi-π688

823

39,64421,949Total

29

Beam related Background (1)~Introduction~ There exists beam related backgrounds at K2K

near detector

From upward, upstream Proton-like and gamma-like short tracks


1track contained30

Beam related background (2)~Measurement setup~
TargetHall

BeamDump

SciBar(1) (2)

z~60m
(1)

z~90m
(2)

31

Scintillators were put on the groundBeam related background (3)~Energy deposit vs. Hit timing~• z~60m• On-timing(3μsec gate)• 25,889 spills
Hits with largeenergy deposit(proton-like?)
Threshold

Many lowenergy hits
(gamma-like?)32

Beam related background (4)~Observed number of events at BNB~
(1) z~60m
On-time(2) z~90m

Off-time

On-timeOff-time# of spills

25,88910,07233,441

10,233Single hit
Scinti. 1

160

140

Single hit
Scinti. 2

37020

1coincidence

50

40

On-time: 1.5μsec gate at beam-timing
Off-time: 1.5μsec gate (~8msec after beam-timing)

The excess of hits at beam-timing was observed!

33

Beam related background (5)~Comparison between BNB and K2K~

POT/spill

Booster Neutrino Beam line

K2K Near Detector Hall

(4.0~4.5)x1012~5x1012

Location

Z~60m
Ground level

Z~90m
Ground level

Single hit(Scinti. 1/2)

1) 38±10(stat)2) 59±10(stat)1) 26±7(stat)2) 25±6(stat)coincidence

8.0±3.6(stat)

Top of SciBar

K2K-ND Hall
Ground level

2.3

18

4.9±2.5(stat)[# of events/spill/15tons]
34