Are recoil polarization measurements of G{sup P}{ovr sub E}/G{sup P}{ovr sub M} consistent with Rosenbluth separation data?

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Recent recoil polarization measurements in Hall A at Jefferson Lab show that the ratio of the electric to magnetic form factors for the proton decreases significantly with increasing Q{sup 2}. This contradicts previous Rosenbluth measurements which indicate approximate scaling of the form factors ({micro}{sub p} G{sub E}{sup p}(Q{sup 2})/G{sub M}{sup p} (Q{sup 2}) {approx} 1). The cross section measurements were reanalyzed to try and understand the source of this discrepancy. They find that the Rosenbluth measurements are consistent when normalization uncertainties are taken into account, and that the discrepancy cannot come from errors in one or two data sets. If ... continued below

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4 pages

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Arrington, J. May 16, 2002.

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Recent recoil polarization measurements in Hall A at Jefferson Lab show that the ratio of the electric to magnetic form factors for the proton decreases significantly with increasing Q{sup 2}. This contradicts previous Rosenbluth measurements which indicate approximate scaling of the form factors ({micro}{sub p} G{sub E}{sup p}(Q{sup 2})/G{sub M}{sup p} (Q{sup 2}) {approx} 1). The cross section measurements were reanalyzed to try and understand the source of this discrepancy. They find that the Rosenbluth measurements are consistent when normalization uncertainties are taken into account, and that the discrepancy cannot come from errors in one or two data sets. If there is a problem in the Rosenbluth data, it must be a systematic, {epsilon}-dependent uncertainty affecting several experiments.

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4 pages

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  • 9th International Conference on the Structure of Baryons (Baryons 2002), Newport News, VA (US), 03/03/2002--03/08/2002

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  • Report No.: ANL/PHY/CP-107691
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 795026
  • Archival Resource Key: ark:/67531/metadc742509

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  • May 16, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 11, 2016, 12:59 p.m.

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Arrington, J. Are recoil polarization measurements of G{sup P}{ovr sub E}/G{sup P}{ovr sub M} consistent with Rosenbluth separation data?, article, May 16, 2002; Illinois. (digital.library.unt.edu/ark:/67531/metadc742509/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.