FINeSSE, Ds Measurement through the Neutrino-Nucleon ... · through the Neutrino-Nucleon Neutral...
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FINeSSE, Δs Measurement through the Neutrino-Nucleon Neutral Current Scattering
Teppei Katori, Indiana University Cyclotron Facility
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
I Physics of ΔsII FINeSSEIII Scibath pilot detector beam test IV Δs measurementV Conclusion
L. Bugel, J. M. Conrad, M. Shaevitz, G. P. ZellerColumbia University, Nevis Labs, Irvington
S. Brice, D. Finley, R. StefanskiFermi National Accelerator Laboratory, Batavia
J. C. PengUniversity of Illinois, Urbana-Champaign
C. Horowitz, T. Katori, H.-O. Meyer, M. Novak, C. Polly, R. Tayloe, G. Visser
Indiana University Cyclotron Facility, Bloomington
C. Green, G. T. Garvey, W. C. Louis, G. McGregor, H. Ray, R. Van de Water
Los Alamos National Laboratory, Los Alamos
W. Metcalf, M. O. WasckoLouisiana State University, Baton Rouge
V. Papavassiliou, S.F. PateNew Mexico State University, Las Cruces
A. Curioni, B. T. FlemingYale University, New Haven, Connecticut
FINeSSE Collaboration
FINe SSEFine-grainedIntense
NeutrinoScattering
ScintillatorExperiment
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
Δs Strange Quark Spin Component in the Nucleon
(Axial Charge of Strange Quark) of the Nucleon Neutral Current Weak Axial Vector IsoScalar
Form Factor (property of the elastic scattering)
isospin
isovector isoscalar
I Physics of Δs1. What is Δs?
02 =Q
( )
( ) )()()()'(2
'2
'
52
520
21
555
21
puQGQGpuG
pssdduupGpJp
sA
TA
F
NNF
N
ZAN
γγτγγ
γγγγγγ
μμ
μμμμ
+−⎟⎠⎞
⎜⎝⎛−=
−−⎟⎠⎞
⎜⎝⎛−=
=
)0( 2 ==Δ QGs sA
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
I Physics of Δs1. What is Δs?
Δs Strange Quark Spin Component in the Nucleon
(Axial Charge of Strange Quark) of integration of the polarized parton distribution function
Δs is the connection between Elastic Scattering (ES) experiment
andDeep Inelastic Scattering (DIS) experiment
∞=2Q∑ Δ= ),(
21),( 222
1 QxqeQxg q
dxQxss ),( 21
0∞=∫Δ=Δ
dxQxssQGsA ),()0( 2
1
0
2 ∞=∫Δ=Δ==
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
I Physics of Δs2. How to measure Δs?
Inclusive leptonic DISex) EMC, SMC
“Spin Crisis”
0.8
0.4
0.0
-0.4
-0.8
-2 0 2
q
u
s
d
g
Spin Muon Collaboration(Phys.Rev.D56(1997)5330)
+μ+μr
pr
⎥⎦⎤
⎢⎣⎡ Δ+Δ+Δ=
∫ ∑ ∫Δ==Γ
sdu
dxxqedxxg q
91
91
94
21
)(21)(
1
0
1
0
211
06.010.0~ ±−Δs
SU(3)f assumptionTeppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
I Physics of Δs2. How to measure Δs?
Semi-Inclusive leptonic DISex) HERMES
“Spin Disaster”
HERMES Collaboration(Phys.Rev.Lett. 92(2004)012005)no extrapolation to x=0
no extrapolation to
)(01.0)(03.003.0 sysstats ±±+=Δ
∫Δ=Δ=
=
30.0
023.0)(
x
xdxxss
+e+er
dr K
Q2
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
I Physics of Δs2. How to measure Δs?Neutrino ESClean, Theoretically Robust Method
Llewellyn-Smith formalism for Neutral Current Elastic Scatteringp p
⎭⎬⎫
⎩⎨⎧
++=
+=
⎪⎭
⎪⎬⎫
⎪⎩
⎪⎨⎧
+⎟⎟⎠
⎞⎜⎜⎝
⎛−+⎟⎟
⎠
⎞⎜⎜⎝
⎛−−⎟⎟
⎠
⎞⎜⎜⎝
⎛+=
⎥⎦
⎤⎢⎣
⎡ −+
−±=
222
22
122
212
22
212
22
22
2
2
22
12
22
2
2
2
22
4
22
222
2
22
2
)(4
)()(41)(
)]([)(
][)(4
14
)(4
1)(4
1)(
)()()()()(8
ZZZA
Z
ZZZA
Z
ZZZZZA
Z
ZZZFz
FMQFGQC
FFGMQQB
FFMQF
MQ
MQF
MQG
MQ
MQQA
MusQC
MusQBQA
EGM
dQd
νπσ
)(21)(
21)( 2212 QGQGQG s
ATA
ZA −±= =
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
I Physics of Δs2. How to measure Δs?Neutrino ESex) BNL E734
with Parity Violating electron (PVe) scattering experiment data
low statisticslarge backgroundextrapolation from relatively high Q2
large error from GsM (task for PVe)
FINeSSE
09.015.0)0( 2
±−===Δ QGs s
A
05.009.0)5.0( 22 ±−===Δ GeVQGs sA
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
Pate ('04)
Garvey et al.('93)
II FINeSSE1. Motivation
Physics- Measurement of Low E neutrino-nucleon
Neutral Current proton (NCp) elastic scattering andCharge Current Quasi-Elastic (CCQE) scattering
Detector Requirement- active high resolution detector- sufficiently low threshold- good performance for large angle event
low Q2 (=2MPTP) and large angle event
1GeV neutrino XS for nucleon knockout from 12C van der Ventel and Piekarewicz
(Phys.Rev.C69(2004)035501)
T p
non-segmented isotropic liquid scintillator detector
p
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
Beam
Z
X
Y
II FINeSSE1. Motivation
non-segmented isotropic liquid scintillator detector
||3-dimiensional tracking detector
segmented liquid scintillator detector
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
The Muon Rangestack- to track and measure the energy of muons
The Vertex Detector- to precisely track low-energy protons- (2.5m)3 active liquid scintillator volume- 19200 (80x80x3) 1.5 mm WLS fibers on 3cm spacing with 3 orientations
FINeSSE detector
Vertex Detector “Scibath”fiber orientation
II FINeSSE2. Fine-grained Neutrino Scintillator Scattering Experiment
Read out PMT and front-end electronics
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
II FINeSSE3. FINeSSE physics
NCp event
simulated hits and reconstructed tracks in the Vertex Detector
generated
reconstructed
XZ
fiber hits,(size ∝ # γ collected)
YZ
XZ
YZ
FINeSSE “Scibath” simulation
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
CCQE event
III Scibath pilot detector beam test1. Pilot type detector
Prototype “Scibath” have been tested by using 200MeV proton beam at Indiana University Cyclotron Facility (IUCF), Radiation Effect Research Program (RERP)
Read out by16ch. MAPMT(H8711)
p
MAPMT
Fiber and MAPMT coupling
1-dimension, 30 WLS fibers array in the liquid scintillator
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
III Scibath pilot detector beam test2. Light yield
Light YieldDetected light is the integration of all light from proton in the detector
pMAPMT
17 2p.e./fiber for near tracks with 200MeV proton
pBeam test setup, RERP@IUCF
trigger1trigger2
Typical ADC spectrum
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
III Scibath pilot detector beam test3. Position resolutionPosition ResolutionAll fibers' information is used to calculate single particle tracks(unlike segmented tracking detector)
MAPMT
p
2cm
Coordinate Position Resolution0.44cm
Angular Position Resolution5.6O
p
p
r
Coordinate position resolution
Angular position resolution
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
IV Δs measurement1. NCp/CCQE ratio
FINeSSE ratio scheme
ratio of NC and CC cancel out neutrino flux uncertainty andnuclear effect uncertainty (relatively model independent)
)()()/(
pnppCCQENCpRμνσννσ
ν →→
=
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
)()()/(
nnppNCnNCpRννσννσ
ν →→
=
Ideally speaking, we want to measure
but this is tough! so instead, we measure,
Maieron and Alberico('03, unpublished)
reconstructedevents
CCQE
NCp
(fiducial)efficiencies
measured ratio (stat & total errors)
Δs = -0.1Δs = 0.0Δs = +0.1
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
IV Δs measurement1. NCp/CCQE ratio
)(025.0)( sysstats +±=Δσ
Experimental error can be extrapolated by using dipole parameterization for Q2 dependence
F2s = 0.0±0.09
F1s = 0.0±0.03
MA = 1.00±0.02 GeV
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
IV Δs measurement2. Δs and other strange quark form factors
)/( CCQENCpRν
also depends on MA, F1
s and F2s
Form factor uncertainties is evaluated from G0 experiment expected errors
)(02.0)( syss ±=Δσ
FINeSSE, Δs Measurement through the Neutrino-Nucleon Neutral Current ScatteringConclusion
I. Δs is a great interest property from the community
II. FINeSSE can measure Δs with theoretically clean and robust method
III. FINeSSE is experimentally capable to measure Δs with the smallest error
Thank you for your attention!
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
More?
III Scibath pilot detector beam test3. Second beam test
p
p
MAPMT Blue-Green fiber scan plot data
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
III Scibath pilot detector beam test3. Second beam Test
Trick of Non-Wave Length ShiftingWe remove the Wave Length Shifter (POPOP) from liquid scintillator (Non-WLS liquid scintillator)and replace fiber from Blue-Green fiber to UV-Blue fiber, for better coordinate resolution and higher light output
PMT
p pPMT
traditional scheme of light transportationp UV Blue Green PMT
new schemep UV Blue PMT
(1) Non-WLS liquid scintillator has shorter attenuation lengthnicely localize light output
(2) Non-WLS liquid scintillator has locally higher light outputhigher amount of light to the nearest fiber
(3) UV-Blue fiber sends blue light to MAPMThigher quantum efficiency
(4) UV process is faster(5) UV light is less reflective
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
II-III Scibath pilot detector beam test3. Second beam Test
Trick of Non-Wave Length ShiftingWe remove the Wave Length Shifter (POPOP) from liquid scintillator (Non-WLS liquid scintillator)and replace fiber from Blue-Green fiber to UV-Blue fiber, for better coordinate resolution and higher light output
PMT
pp
PMT
traditional scheme of light transportationp UV Blue Green PMT
new schemep UV Blue PMT
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
III Scibath pilot detector beam test3. Second beam test
p
p
MAPMT
Blue-Green fiber scan plot data
UV-Blue fiber scan plot data
UV-Blue fiber makes sharper and narrower peak than
Blue-Green fiber
better light localization
better position resolutionTeppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05
IIII Scibath pilot detector beam test3. Second beam testMonte Carlo Comparison
combination of UV-Blue fiber and Non-WLS Liquid Scintillator gives better position resolution!
Blue-Green fiber resolution
UV-Blue fiber resolution
~X2 better resolution
Coordinate resolution
Angular resolution
Teppei Katori, Indiana University Cyclotron Facility, Pacific Spin 2005, Jul. 5, 05