Two-Photon Exchange E#27;ffects in Elastic Electron-Proton Scattering

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Two methods, Rosenbluth separation and polarization transfer, can be used to extract the proton form factor ratio #22;mu_p G_Ep/G_Mp, but they do not yield the same results. It is thought that the disagreement is due to two photon exchange corrections to the #27;differential cross sections. High precision proton Rosenbluth extractions were carried out at 102 kinematics points spanning 16 values of momentum transfer Q^2, from 0.40 to 5.76 GeV^2. Reduced cross sections were found to 1.1% or better for Q^2 less than 3 GeV^2, increasing to 4% at 5.76 GeV^2. The form factor ratios were determined to 1:5-3% for Q2 ... continued below

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Laboratory, Argonne National August 1, 2013.

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Two methods, Rosenbluth separation and polarization transfer, can be used to extract the proton form factor ratio #22;mu_p G_Ep/G_Mp, but they do not yield the same results. It is thought that the disagreement is due to two photon exchange corrections to the #27;differential cross sections. High precision proton Rosenbluth extractions were carried out at 102 kinematics points spanning 16 values of momentum transfer Q^2, from 0.40 to 5.76 GeV^2. Reduced cross sections were found to 1.1% or better for Q^2 less than 3 GeV^2, increasing to 4% at 5.76 GeV^2. The form factor ratios were determined to 1:5-3% for Q2 < 1.5 GeV^2, increasing to 9% by 3 GeV^2 and rapidly above. Our data agrees with prior Rosenbluth, improving upon it the 1.0 - 2.0 GeV^2 range to conclusively show a separation from polarization transfer where it had not been certain before. In addition, reduced cross sections at each Q^2 were tested for nonlinearity in the angular variable. Such a departure from linearity would be a signature of two photon exchange effects, and prior data had not been #30;sufficiently precise to show nonzero curvature. Our data begins to hint at negative curvature but does not yet show a significant departure from zero.

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  • Related Information: JLAB EXP-05-017

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  • Report No.: JLAB-PHY-13-1795
  • Report No.: DOE/OR/23177-2774
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1093450
  • Archival Resource Key: ark:/67531/metadc832092

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • August 1, 2013

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  • May 19, 2016, 9:45 a.m.

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  • June 3, 2016, 3:53 p.m.

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Laboratory, Argonne National. Two-Photon Exchange E#27;ffects in Elastic Electron-Proton Scattering, thesis or dissertation, August 1, 2013; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc832092/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.