G(Ep)/G(Mp) ratio by polarization transfer in (e)over-right-arrowp -> e(p)over-right-arrow

Citation
Mk. Jones et al., G(Ep)/G(Mp) ratio by polarization transfer in (e)over-right-arrowp -> e(p)over-right-arrow, PHYS REV L, 84(7), 2000, pp. 1398-1402
Citations number
38
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
84
Issue
7
Year of publication
2000
Pages
1398 - 1402
Database
ISI
SICI code
0031-9007(20000214)84:7<1398:GRBPTI>2.0.ZU;2-U
Abstract
The ratio of the proton's elastic electromagnetic form factors, G(Ep)/G(Mp) , was obtained by measuring P-t and P-l, the transverse and the longitudina l recoil proton polarization, respectively For elastic (e) over right arrow p --> e (p) over right arrow, G(Ep)/G(Mp) is proportional to P-t/P-l. Simu ltaneous measurement of P-t and P-l in a polarimeter provides good control of the systematic uncertainty. The results for the ratio G(Ep)/G(Mp) show a systematic decrease as Q(2) increases from 0.5 to 3.5 GeV2, indicating for the first time a definite difference in the spatial distribution of charge and magnetization currents in the proton.