Phys. Rev. Lett. 94, 142301 (2005) [5 pages]
Precision Rosenbluth Measurement of the Proton Elastic Form Factors
I. A. Qattan et al.
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I. A. Qattan1,2, J. Arrington2, R. E. Segel1, X. Zheng2, K. Aniol3, O. K. Baker4, R. Beams2, E. J. Brash5, J. Calarco6, A. Camsonne7, J.-P. Chen8, M. E. Christy4, D. Dutta9, R. Ent8, S. Frullani10, D. Gaskell11, O. Gayou12, R. Gilman13,8, C. Glashausser13, K. Hafidi2, J.-O. Hansen8, D. W. Higinbotham8, W. Hinton14, R. J. Holt2, G. M. Huber5, H. Ibrahim14, L. Jisonna1, M. K. Jones8, C. E. Keppel4, E. Kinney11, G. J. Kumbartzki13, A. Lung8, D. J. Margaziotis3, K. McCormick13, D. Meekins8, R. Michaels8, P. Monaghan9, P. Moussiegt15, L. Pentchev12, C. Perdrisat12, V. Punjabi16, R. Ransome13, J. Reinhold17, B. Reitz8, A. Saha8, A. Sarty18, E. C. Schulte2, K. Slifer19, P. Solvignon19, V. Sulkosky12, K. Wijesooriya2, and B. Zeidman2
1Northwestern University, Evanston, Illinois 60208, USA
2Argonne National Laboratory, Argonne, Illinois 60439, USA
3California State University at Los Angeles, Los Angeles, California 90032, USA
4Hampton University, Hampton, Virginia 23668, USA
5University of Regina, Regina, Saskatchewan, Canada, S4S 0A2
6University of New Hampshire, Durham, New Hampshire 03824, USA
7Université Blaise Pascal Clermont-Ferrand et CNRS/IN2P3 LPC 63, 177 Aubière Cedex, France
8Jefferson Laboratory, Newport News, Virginia 23606, USA
9Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
10Istituto Nazionale di Fisica Nucleare, Sezione Sanità, 00161 Roma, Italy
11University of Colorado, Boulder, Colorado 80309, USA
12College of William and Mary, Williamsburg, Virginia 23187, USA
13Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
14Old Dominion University, Norfolk, Virginia 23529, USA
15Laboratorie de Physique Subatomique et de Cosmologie, F-38026 Grenoble, France
16Norfolk State University, Norfolk, Virginia 23529, USA
17Florida International University, Miami, Florida 33199, USA
18Saint Mary’s University, Halifax, Nova Scotia, Canada B3H 3C3
19Temple University, Philadelphia, Pennsylvania 19122, USA
Received 7 October 2004; published 15 April 2005
We report the results of a new Rosenbluth measurement of the proton electromagnetic form factors at Q2 values of 2.64, 3.20, and 4.10 GeV2. Cross sections were determined by detecting the recoiling proton, in contrast to previous measurements which detected the scattered electron. Cross sections were determined to 3%, with relative uncertainties below 1%. The ratio μpGE/GM was determined to 4%–8% and showed μpGE/GM≈1. These results are consistent with, and much more precise than, previous Rosenbluth extractions. They are inconsistent with recent polarization transfer measurements of similar precision, implying a systematic difference between the techniques.
©2005 The American Physical Society
URL: http://link.aps.org/doi/10.1103/PhysRevLett.94.142301
DOI: 10.1103/PhysRevLett.94.142301
PACS: 25.30.Bf, 13.40.Gp, 14.20.Dh
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