National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Are Recoil Polarization Measurements of G(P)(E)/G(P)(M) Consistent with Rosenbluth Separation Data.

DE200243168

Publication Date	2002
Personal Author	Arrington, J.
Page Count	8
Abstract	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.
Keywords	Polarization Baryons Cross sections Form factors Protons Electron scattering Rosenbluth separation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200222

Are Recoil Polarization Measurements of G(P)(E)/G(P)(M) Consistent with Rosenbluth Separation Data.

Are Recoil Polarization Measurements of G(P)(E)/G(P)(M) Consistent with Rosenbluth Separation Data.
DE200243168

Publication Date	2002
Personal Author	Arrington, J.
Page Count	8
Abstract	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.
Keywords	Polarization Baryons Cross sections Form factors Protons Electron scattering Rosenbluth separation
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Argonne National Lab., IL.; Department of Energy, Washington, DC.
Supplemental Notes	Sponsored by Department of Energy, Washington, DC.
Document Type	Technical Report
NTIS Issue Number	200222