Precision Rosenbluth Measurement of the Proton Elastic Form Factors

Qattan, I. A.; Arrington, J.; Segel, R. E.; Zheng, X.; Aniol, K.; Baker, O. K.; Beams, R.; Brash, E. J.; Calarco, J.; Camsonne, A.; Chen, J. -P.; Christy, M. E.; Dutta, D.; Ent, R.; Frullani, S.; Gaskell, D.; Gayou, O.; Gilman, R.; Glashausser, C.; Hafidi, K.; Hansen, J. -O.; Higinbotham, D. W.; Hinton, W.; Holt, R. J.; Huber, G. M.; Ibrahim, H.; Jisonna, L.; Jones, M. K.; Keppel, C. E.; Kinney, E.; Kumbartzki, G. J.; Lung, A.; Margaziotis, D. J.; McCormick, K.; Meekins, D.; Michaels, R.; Monaghan, P.; Moussiegt, P.; Pentchev, L.; Perdrisat, C.; Punjabi, V.; Ransome, R.; Reinhold, J.; Reitz, B.; Saha, A.; Sarty, A.; Schulte, E. C.; Slifer, K.; Solvignon, P.; Sulkosky, V.; Wijesooriya, K.; Zeidman, B.

doi:10.1103/PhysRevLett.94.142301

Title: Precision Rosenbluth Measurement of the Proton Elastic Form Factors

Journal Article · Fri Apr 01 00:00:00 EST 2005 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.94.142301· OSTI ID:834054

Qattan, I. A.; Arrington, J.; Segel, R. E.; Zheng, X.; Aniol, K.; Baker, O. K.; Beams, R.; Brash, E. J.; Calarco, J.; Camsonne, A.; Chen, J. -P.; Christy, M. E.; Dutta, D.; Ent, R.; Frullani, S.; Gaskell, D.; Gayou, O.; Gilman, R.; Glashausser, C.; Hafidi, K. more »

We report the results of a new Rosenbluth measurement of the proton form factors at Q{sup 2} values of 2.64, 3.20 and 4.10 GeV{sup 2}. Cross sections were determined by detecting the recoiling proton in contrast to previous measurements in which the scattered electron was detected. At each Q{sup 2}, relative cross sections were determined to better than 1%. The measurement focused on the extraction of G{sub E}/G{sub M} which was determined to 4-8% and found to approximate form factor scaling, i.e. {mu}{sub p}G{sub E} {approx} G{sub M}. These results are consistent with and much more precise than previous Rosenbluth extractions. However, they are inconsistent with recent polarization transfer measurements of comparable precision, implying a systematic difference between the two techniques.

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Research Organization:: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Energy Research (ER) (US)

DOE Contract Number:: AC05-84ER40150

OSTI ID:: 834054

Report Number(s):: JLAB-PHY-04-33; DOE/ER/40150-2951; nucl-ex/0410010; PRLTAO; TRN: US0407189

Journal Information:: Physical Review Letters, Vol. 94, Issue 14; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

References (14)

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