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A 1 Analysis for E06-014. Diana Parno for the E06-014 collaboration. CENPA, University of Washington. June 10, 2011. Introduction: Deep Inelastic Scattering. k ’. k. Start with a polarized electron and a polarized nucleon. Incident electron. Scattered electron.

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a 1 analysis for e06 014

A1 Analysis for E06-014

Diana Parno

for the E06-014 collaboration

CENPA, University of Washington

June 10, 2011

introduction deep inelastic scattering
Introduction: Deep Inelastic Scattering

k’

k

  • Start with a polarized electron and a polarized nucleon

Incident electron

Scattered electron

  • They exchange a virtual photon

q

Virtual photon

  • Virtual photon probes single quasi-free quark inside nucleon

Incident nucleon

  • We measure scattered electron

p

Hall A Collaboration Meeting, 10 June 2011

virtual photon asymmetries
Virtual Photon Asymmetries
  • What spin information do we have at the hadron vertex?

Photon spin

Nucleon spin

Photon spin

Nucleon spin

  • We can form an asymmetry based on this relationship

Same helicities:

Opposite helicities:

Hall A Collaboration Meeting, 10 June 2011

existing dis data on nucleon a 1
Existing DIS Data on Nucleon A1

Hall A Collaboration Meeting, 10 June 2011

measurement strategy
Measurement Strategy
  • E06-014 ran in February-March 2009
  • Large x range from BigBite
  • Form double-spin asymmetries (parallel and perpendicular target spin) corrected for polarization
  • Kinematics, world F2 data then give us A1

Hall A Collaboration Meeting, 10 June 2011

e06 014 setup in hall a
E06-014 Setup in Hall A

Beam direction

Compton

Polarimeter

Polarized 3He target

BigBite spectrometer

Photos from Transversity (E06-010) Photo Diary

Hall A Collaboration Meeting, 10 June 2011

final beam polarization results
Final Beam Polarization Results
  • Combine Compton and Møller results to achieve error of ~1.6%
measuring 3 he polarization
Measuring 3He Polarization
  • NMR every four hours (target chamber)
  • EPR every spin rotation (pumping chamber)

Calculation by Yawei Zhang

scattered electron sample
Scattered Electron Sample
  • Negligible pion contamination
  • Errors in momentum reconstruction form primary background

Hall A Collaboration Meeting, 10 June 2011

nitrogen dilution factor
Nitrogen Dilution Factor
  • Target’s nitrogen content dilutes asymmetry
a 1 on 3 he with 4 74 gev electrons
A1 on 3He with 4.74-GeV electrons
  • Low-x bins will be more affected by radiative corrections and pair-production (not yet applied)

Preliminary

E142: Phys. Rev. D 54: 6620 (1996)

E99117: Phys. Rev. C 70: 065207 (2004)

Hall A Collaboration Meeting, 10 June 2011

conclusion
Conclusion
  • We’ve measured A1 on 3He from part of the E06-014 dataset
    • Wide x range (0.15 ≤ x ≤ 0.55 DIS, 0.60≤x≤1.0 resonance)
    • Support for previous measurements
    • Details in thesis (available at http://hallaweb.jlab.org/experiment/E06-014/talks/)
  • Future work
    • Analysis tweaks
    • Radiative corrections, pair-production corrections
    • New dataset: Ee = 5.9 GeV
    • Extraction of neutron A1

Hall A Collaboration Meeting, 10 June 2011

slide13

Thanks go to the Hall A collaboration and staff who made this experiment possible

Thank you!

  • Special thanks go to the primary analysis team:
    • Brad Sawatzky
    • David Flay
    • Matt Posik
    • Yawei Zhang
    • Gregg Franklin
    • Zein-EddineMeziani

Hall A Collaboration Meeting, 10 June 2011

bigbite spectrometer
BigBite Spectrometer
  • Magnet
    • Separates by charge and momentum
  • MWDCs
    • Reconstruct trajectory, forward and back

Scattered

particles

  • Gas Čerenkov
    • Removes pions from online trigger
  • Calorimeter
    • Measures energy
    • Particle identification

Adapted from XinQian, PhD thesis, 2010

Hall A Collaboration Meeting, 10 June 2011

electron 3 he asymmetries
Electron-3He Asymmetries

Hall A Collaboration Meeting, 10 June 2011

a 1 and a 2 on 3 he
A1 and A2 on 3He

Hall A Collaboration Meeting, 10 June 2011