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Precision Measurement of G E p /G M p with BLAST

Precision Measurement of G E p /G M p with BLAST. Chris Crawford MIT Laboratory for Nuclear Science for the BLAST collaboration. Motivation. † Nucleon Electromagnetic Form Factors, Haiyan Gao, Int. J. of Mod. Phys. E, 12, No. 1, 1-40(Review) (2003). Form Factor Ratio @ BATES.

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Precision Measurement of G E p /G M p with BLAST

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  1. Precision Measurement of GEp/GMp with BLAST Chris Crawford MIT Laboratory for Nuclear Science for the BLAST collaboration

  2. Motivation †Nucleon Electromagnetic Form Factors, Haiyan Gao, Int. J. of Mod. Phys. E, 12, No. 1, 1-40(Review) (2003)

  3. Form Factor Ratio @ BATES • New technique: polarized beam and target • Exploits unique features of BLAST • internal target: low dilution, fast spin reversal • large acceptance: simultaneous measurement of all Q2 points • symmetric detector: ratio measurement • Different systematics • insensitive to Pb and Pt • Q2 = 0.07 – 0.9 (GeV/c) 2 • overlap with JLab dataand RpEX (future exp.at Bates to measure rp)

  4. Asymmetry Super-ratio Method • Polarized cross section • Super-ratio

  5. BLAST Coils Backward-Angle TOF TOF Scintillators Wire Chambers Cerenkov Detectors Neutron Detectors LADS Detectors Detector Package

  6. BLAST

  7. Garfield drift time simulation Newton-Rhapson track fitter 200μm resolution 20:1 signal to noise ratio Wire Chamber Tracking

  8. Theta Resolution Preliminary Data Beam Asymmetry Yield

  9. Projected Results • Statistics • A1, A2 • Systematics • θ*1, θ*2 Δp, Δθ, Δβ Errors are minimized as a function of β (target spin angle)

  10. R. Alarcon, E. Geis, J. Prince, B. Tonguc, A. Young Arizona State University  J. Althouse, C. D’Andrea, A. Goodhue, J. Pavel, T. Smith, Dartmouth College T. Akdogan, W. Bertozzi, T. Botto, M. Chtangeev, B. Clasie, C. Crawford, A. Degrush, K. Dow, M. Farkhondeh, W. Franklin, S. Gilad, D. Hasell, E. Ilhoff, J. Kelsey, H. Kolster, A. Maschinot, J. Matthews, N. Meitanis, R. Milner, R. Redwine, J. Seely, S.Sobczynski, C. Tschalaer, E. Tsentalovich, W. Turchinetz, Y. Xiao, H. Xiang, C. Zhang, V. Ziskin, T. Zwart Massachusetts Institute of Technology Bates Linear Accelerator Center D. Dutta, H. Gao, W. Xu Duke University J. Calarco, W. Hersman, M. Holtrop, O. Filoti, P. Karpius, A. Sindile, T. Lee University of New Hampshire J. Rapaport Ohio University K. McIlhany, A. Mosser United States Naval Academy  J. F. J. van den Brand, H. J. Bulten, H. R. Poolman Vrije Universitaet and NIKHEF W. Haeberli, T. Wise University of Wisconsin BLAST Collaboration

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