FINeSSE, Ds Measurement through the Neutrino-Nucleon ... · through the Neutrino-Nucleon Neutral...

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


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


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==


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


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 −±= =


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


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


Beam

Z

X

Y

II FINeSSE1. Motivation

non-segmented isotropic liquid scintillator detector

||3-dimiensional tracking detector

segmented liquid scintillator detector


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


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


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


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


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


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 →→

=


)()()/(

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


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


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!


III Scibath pilot detector beam test3. Second beam test

p

p

MAPMT Blue-Green fiber scan plot data


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


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


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


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