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Analysis of Deep Inelastic Scattering for E06-014 Collaboration at CENPA, University of Washington

This report presents an analysis of deep inelastic scattering (DIS) from the E06-014 collaboration, exploring spin asymmetries in polarized electron and nucleon interactions. The project, conducted in early 2009, utilized a polarized 3He target and advanced spectrometry techniques to measure double-spin asymmetries across a broad x range. Results from this dataset support previous measurements and highlight the importance of assessing radiative corrections and future datasets for neutron A1 extractions. Special thanks are awarded to the collaboration and the primary analysis team.

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Analysis of Deep Inelastic Scattering for E06-014 Collaboration at CENPA, University of Washington

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  1. A1 Analysis for E06-014 Diana Parno for the E06-014 collaboration CENPA, University of Washington June 10, 2011

  2. 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

  3. 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

  4. Existing DIS Data on Nucleon A1 Hall A Collaboration Meeting, 10 June 2011

  5. 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

  6. 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

  7. Final Beam Polarization Results • Combine Compton and Møller results to achieve error of ~1.6%

  8. Measuring 3He Polarization • NMR every four hours (target chamber) • EPR every spin rotation (pumping chamber) Calculation by Yawei Zhang

  9. Scattered Electron Sample • Negligible pion contamination • Errors in momentum reconstruction form primary background Hall A Collaboration Meeting, 10 June 2011

  10. Nitrogen Dilution Factor • Target’s nitrogen content dilutes asymmetry

  11. 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

  12. 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

  13. 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

  14. 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

  15. Electron-3He Asymmetries Hall A Collaboration Meeting, 10 June 2011

  16. A1 and A2 on 3He Hall A Collaboration Meeting, 10 June 2011

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