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E05-102 Experimental Status Report: . Vincent A. Sulkosky Massachusetts Institute of Technology Hall A Collaboration Meeting December 15, 2011. Physics m otivation.

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e05 102 experimental status report

E05-102 Experimental Status Report:

Vincent A. Sulkosky

Massachusetts Institute of Technology

Hall A Collaboration Meeting

December 15, 2011

physics m otivation
Physicsmotivation
  • Goal: understanding 3He ground-state spin structure helps in a variety ofexperiments that try to extract neutron information from3He
  • Theoretically:
    • nucleon-nucleon potential theory predicts three components in the 3He ground-state wave-function.
    • Understanding the role of the small components of the 3He ground-state wave function, S’ and D states, helps us understand the “standard model” of the few-body system
  • Double polarization measurements have large sensitivities to both S’ and D components
deuterium spin structure
Deuterium Spin Structure
  • Spin-1 Particle, 2 spin-1/2Nucleons (Proton and Neutron)

Angular Momentuml=0 l=2

~90% ~10%

asymmetry measurements at nikhef
Asymmetry Measurements at NIKHEF
  • A sign flip of asymmetry with the increase of missing momentum gave an indication of the existence of D state
  • Sign flip happened at around Fermi momentum of deuterium nucleus

I. Passchier et al., Phys. Rev. Lett. 88 (2002) 102302.

3 he spin structure
3He spin structure
  • Spin-1/2 Particle, 3 spin-1/2 Nucleons (Proton and Neutron)
  • S’ mixed symmetry, (spin-isospin)-space correlations

Effective

Polarized

Neutron

Target

Angular Momentuml=0 l=0 l=2

~90% ~1-2% ~8%

3 he experiments
3HeExperiments

X. Zheng et al., Phys. Rev. C 70, 065207(2004)

  • JLab experiment E99-117 measured neutron asymmetry A1n in the DIS region, the leading error other than statistical is caused by uncertainty in the effective proton and neutron polarization in 3He
  • New data at (almost) identical Q2 for

simultaneously over a broad range of pmiss poses strong constraints on calculations

slide8

High Resolution Spectrometer (HRS):

detected scattered electrons at 12.5º and 14.5º

BigBite Spectrometer:

  • detected protons and deuterons with

large acceptance at 75º and 82º

  • Two wire chambers and two scintillator

planes

3 he target
3He Target
  • Hybrid K-Rb spin exchange

optical pumping

  • High in-beam polarization:

~ 50-60%

  • Narrow band-width laser

Preliminary

separating protons and deuterons
Separating Protons and Deuterons
  • 1-2% deuterons and rest are protons
bigbite optic s vertex
BigBiteOptics: Vertex

Resolution: 1.6 cm over 40 cm

Results to be submitted to NIM, M. Mihovilovič et al.

preliminary asymmetry results
Preliminary Asymmetry Results
  • Longitudinal and transverse are with respect to the electron

momentum.

  • Work by M. Mihovilovič

Preliminary

Preliminary

Q2 = 0.37 GeV2

Q2 = 0.28 GeV2

remaining tasks
Remaining Tasks
  • Correct final (minor) bugs in the analysis code regarding

considered cuts.

  • Complete analysis of the proton asymmetries. Some of

data were not analyzed yet due to a problem with zlib.

  • Do the deuteron analysis with the new analysis scripts.
  • Complete the systematic error analysis (false

asymmetry corrections). We expect these corrections

to be small.

  • Finalize the target polarizationin the scattering chamber. Need to consider the target orientation corrections, which are expected to be small.
extraction of g e n at q 2 1 gev c 2 by measurements of
Extraction of GEn at Q2=1 (GeV/c)2 by Measurements of
  • GEnwas extracted for the first time by inclusive polarized measurements from 3He
  • Getting the ratio of asymmetries in longitudinal and transverse target polarization; separating the electric and magnetic form factor contributions
  • Proton and neutron contributions calculated in PWIA
  • New technique, confirms previous measurements; uncertainty: ~18%, largely statistical
the ratio of asymmetries as functions of form factors
The ratio of asymmetries as functions of form factors
  • By measuring ATL’/AT’ and using GEp, GMn, and GMnas known parameters can one extract GEn
final result of g e n at q 2 0 95 gev c 2
Final result of GEnat Q2=0.95 (GeV/c)2
  • GEn/GD=0.226±0.041 (stat)±0.016 (syst)
  • GEn=0.0414±0.0077 (stat)±0.0032 (syst)

Work by Jin Ge

summary
Deuterium asymmetry: experiment and theories

(N-N potential theory)

3He asymmetry: theories but no experiment until

JLab experiment E05-102

Analysis ongoing and preliminary results are

now available

Papers:

NIM article on BigBite Hadron package almost ready

Inclusive measurement of GEnat Q2 ~ 1 (GeV/c)2 draft

being edited.

Summary
slide19
Graduate Students

G. Jin, University of Virginia

E. Long, Kent State University

M. Mihovilovič, Jožef Stefan Institute

Y. Zhang, Lanzhou University

Run Coordinators

A. Camsonne, Jefferson Lab

P. Monaghan, Hampton University

S. Riordan, University of Virginia

B. Sawatzky, Temple University

R. Subedi, University of Virginia

V. Sulkosky, MIT

Y. Qiang, Duke University

B. Zhao, College of William and Mary

Thanks to the Hall A Quasi-Elastic

Family Experiments

Spokespersons

T. Averett, College of William and Mary (E05-015, E08-005)

J. P. Chen, Jefferson Lab (E05-015)

S. Gilad, MIT (E05-102)

D. Higinbotham, Jefferson Lab (E05-102, E08-005)

X. Jiang, Rutgers University (E05-015)

W. Korsch, University of Kentucky (E05-102)

B. E. Norum, University of Virginia (E05-102)

S. Sirca, University of Ljubljana (E05-102)

V. Sulkosky, MIT (E08-005)

E05-015,

E08-005,

and E05-102

Collaboration

F. Salvatore

M. Shabestari

A. Shahinyan

B. Shoenrock

J. St. John

A. Tobias

W. Tireman

G. M. Urciuoli

D. Wang

K. Wang

J. Watson

B. Wojtsekhowski

Z. Ye

X. Zhan

X. Zheng

L. Zhu

K. Allada

B. Anderson

J. R. M. Annand

W. Boeglin

P. Bradshaw

M. Canan

C. Chen

R. De Leo

X. Deng

A. Deur

C. Dutta

L. El Fassi

D. Flay

F. Garibaldi

H. Gao

R. Gilman

S. Golge

O. Hansen

T. Holmstrom

J. Huang

H. Ibrahim

E. Jensen

M. Jones

H. Kang

J. Katich

C. W. Kees

P. King

J. LeRose

R. Lindgren

H. Lu

W. Luo

P. Markowitz

M. Meziane

R. Michaels

B. Moffit

N. Muangma

H. P. Khanal

K. Pan

D. Parno

E. Piasetzky

M. Posik

A. J. R. Puckett

X. Qian

X. Qui

A. Saha

helicity asymmetry in electron scattering
Helicity asymmetry in electron scattering

where R’s are response functions and v’s are kinematics factors

T. D. Donnelly and A. S. Raskin, Ann. Phys 169, 247 (1986)

3 he inclusive response functions near quasi elastic peak in pwia
3He inclusive response functions near quasi-elastic peak in PWIA

Transverse-

longitudinal:

Transverse:

where H’s are calculated by momentum distribution and nucleon polarization in 3He

Proton: HpT’

Neutron: Hn

Proton: HpTL’

A. Kievsky, E. Pace, G. Salme’ and M. Viviani, PRC 56 (1997) p.64