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

Arrington, J.

Technical Information Center Oak Ridge Tennessee

关键词: Polarization;    Baryons;    Cross sections;    Form factors;    Protons;   

RP-ID  :  DE200243168

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

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.