Precision Measurements of the Proton Elastic Form Factor Ratio

Conference · Sun Aug 01 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3483410· OSTI ID:986355

Higinbotham, Douglas

New high precision polarization measurements of the proton elastic form factor ratio in the Q^2 from 0.3 to 0.7 [GeV/c]^2 have been made. These elastic H(e,e'p) measurementswere done in Jefferson Lab's Hall A using 80% longitudinally polarized electrons and recoil polarimetry. For Q^2 greater than 1 [GeV/c]^2, previous polarization data indicated a strong deviation of the form factor ratio from unity which sparked renewed theoretical and experimental interest in how two-photon diagrams have been taken into account. The new high precision data indicate that the deviation from unity, while small, persists even at Q^2 less than 1 [GeV/c]^2.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 986355
• Report Number(s): JLAB-PHY-10-1125; DOE/OR/23177-1118; TRN: US1006329
• Journal Information: AIP Conference Proceedings, Vol. 1257; Conference: HADRON 2009, Tallahassee, FL, 29 November–4 December 2009
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
ELECTRONS
FORM FACTORS
HADRONS
POLARIMETRY
POLARIZATION
PROTONS