precision measurement of g e p /g m p with blast

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Precision Measurement of G E p /G M p with BLAST Chris Crawford MIT Laboratory for Nuclear Science for the BLAST collaboration

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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. - PowerPoint PPT Presentation

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Page 1: Precision Measurement of G E p /G M p with BLAST

Precision Measurement of GE

p/GMp with BLAST

Chris Crawford

MIT Laboratory for Nuclear Science

for the BLAST collaboration

Page 2: Precision Measurement of G E p /G M p with BLAST

Motivation

†Nucleon Electromagnetic Form Factors, Haiyan Gao, Int. J. of Mod. Phys. E, 12,

No. 1, 1-40(Review) (2003)

Page 3: Precision Measurement of G E p /G M p with BLAST

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 data

and RpEX (future exp.at Bates to measure rp)

Page 4: Precision Measurement of G E p /G M p with BLAST

Asymmetry Super-ratio Method

Polarized cross section

Super-ratio

Page 5: Precision Measurement of G E p /G M p with BLAST

Detector Package

BLAST Coils

Backward-Angle TOF

TOF Scintillators

Wire Chambers

Cerenkov Detectors

Neutron Detectors

LADS Detectors

Page 6: Precision Measurement of G E p /G M p with BLAST

BLAST

Page 7: Precision Measurement of G E p /G M p with BLAST

Wire Chamber Tracking

Garfield drift time simulation Newton-Rhapson track fitter

200μm resolution 20:1 signal to noise ratio

Page 8: Precision Measurement of G E p /G M p with BLAST

Preliminary Data

Theta Resolution

Beam AsymmetryYield

Page 9: Precision Measurement of G E p /G M p with BLAST

Projected Results

Statistics» A1, A2

Systematics

» θ*1, θ*

2

Δp, Δθ, Δβ

Errors are minimized as a function of β (target spin angle)

Page 10: Precision Measurement of G E p /G M p with BLAST

BLAST Collaboration

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 TechnologyBates 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

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