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Experiment E01-020 (e,e'p) Studies of the Deuteron at High Q 2

Experiment E01-020 (e,e'p) Studies of the Deuteron at High Q 2. P.E. Ulmer Old Dominion University. Spokespersons: W. Boeglin, M. Jones, A. Klein, P. Ulmer and E. Voutier Postdoc: R. Roch é Graduate Students: L. Coman and H. Ibrahim. Outline. Physics Motivation Some Analysis Results

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Experiment E01-020 (e,e'p) Studies of the Deuteron at High Q 2

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  1. Experiment E01-020(e,e'p) Studies of the Deuteron at High Q2 P.E. Ulmer Old Dominion University Spokespersons: W. Boeglin, M. Jones, A. Klein, P. Ulmer and E. Voutier Postdoc: R. Roché Graduate Students: L. Coman and H. Ibrahim

  2. Outline • Physics Motivation • Some Analysis Results • VDC tracking • Target density studies • Beam position studies • Beam energy shifts • Preliminary Physics Results

  3. Physics Motivation

  4. Physics Motivation Overview Elastic Deep Inelastic  Quasielastic N*  Wavefunction (parallel kin) RLT (relativity) (perpendicular kin) MECs/ICs (parallel kin) FSI (neutron angular distribution) Kinematics: Q2=0.8, 2.1, 3.5 GeV2 Pmiss = 0-500 MeV/c

  5. RLT and Relativity • Relativistic current operator • Longitudinal piece contains additional spin- orbit term • Can interfere with spin-flip magnetization term in transverse current • Non-relativistically, get no such contribution since L reflects charge only and can’t interfere with spin-flip part of T: different final states

  6. RLT (projected uncertainties)

  7. Final State Interactions

  8. Eikonal Approximation • FSI described as sequential multiple scatterings • , b impact parameter • successfully used in hadron scattering • for nucleons at rest  Glauber approximation • for moving nucleons  Generalized Eikonal Approximation (GEA, Sargsian), Generalized Glauber Approximation (GGA, Ciofi degli Atti), Relativistic Multiple Scattering Glauber Approximation (RMSGA, Ryckebusch)

  9. Some Analysis Results

  10. Analysis Overview

  11. VDCs

  12. z VDC U1 two-cluster intersection cluster 1 cluster 2 z = 0 z-inter Spectrometer exit window

  13. u1 v1 z-coordinate of intersection of tracks for two clusters Exit window # Events Left Arm z relative to each VDC plane (m)

  14. Transverse dimension: Left Arm -8.6 cm +9.2 cm Positions taken from Gaussian fits (not shown). Distance between peaks: 17.8 cm Width of exit window: 17.1 cm Y for 2 cluster intersection (using u1 and v1) (meters)

  15. Event Display (R. Roché)

  16. Target Density

  17. Cuts: -4<εm<10 MeV 3mult7 clusters=1 Corrections: T5/E5 no VDC corr. LH2 Boiling: 15 cm cigar cell Raster: 2mm x 2mm nominal, Fan: 60Hz 23.3% at 100 μA! Events/charge (arb. Units) PRELIMINARY Beam Current (μA)

  18. LD2 Boiling: ~9% variation / 100 uA2mm x 2mm raster

  19. LD2 Boiling: ~4% variation / 100 uA4mm x 4mm raster

  20. Beam Position

  21. Beam Position(Reactz vs. BeamX for foil & raster) Right Arm Left Arm

  22. Reactz vs. BeamX BeamX Scaled by Factor of 1.3 Left Arm Right Arm

  23. Beam Energy

  24. Beam Energy Shifts 0.5 MeV 2 MeV Q2=0.8 GeV2 Q2=2.1 GeV2

  25. 1H(e,e'p) Missing Energy Emiss (MeV) Emiss (MeV) Using Arc Energy (2843.6 MeV) Using Tiefenbach Energy

  26. Physics (Preliminary) Results

  27. Preliminary Results Q2 = 2.1 (GeV/c)2 Q2 = 3.5 (GeV/c)2 FSI/PWIA FSI/PWIA nq nq Calculation J.M. Laget

  28. Summary • Lessons learned • Always use hardware collimators in HRS • Never use cigar cell targets • Watch beam energy carefully • Main hurdles ahead • VDC tracking efficiency • Target boiling studies • Absolute normalizations • Status • First post-running analysis pass nearly complete • Expect preliminary cross sections in few months

  29. Credits Thanks to Werner Boeglin, Luminita Coman and Hassan Ibrahim for help with this talk.

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