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Title High Precision Measurement of the Proton Elastic Form Factor Ratio at Low Q2
Abstract Experiment E08-007 measured the proton elastic form factor ratio ?pGE/GM in the range of Q2 = 0.3?0.7(GeV/c)2 by recoil polarimetry. Data were taken in 2008 at the Thomas Jefferson National Accelerator Facility in Virginia, USA. A 1.2 GeV polarized electron beam was scattered off a cryogenic hydrogen target. The recoil proton was detected in the left HRS in coincidence with the elasticly scattered electrons tagged by the BigBite spectrometer. The proton polarization was measured by the focal plane polarimeter (FPP). In this low Q2 region, previous measurement from Jefferson Lab Hall A (LEDEX) along with various fits and calculations indicate substantial deviations of the ratio from unity. For this new measurement, the proposed statistical uncertainty (< 1%) was achieved. These new results are a few percent lower than expected from previous world data and fits, which indicate a smaller GEp at this region. Beyond the intrinsic interest in nucleon structure, the new results also have imp
Author(s) Xiaohui Zhan
Publication Date January 2010
Document Type Thesis
Primary Institution Massachusetts Institute of Technology, Cambridge, MA
Affiliation Exp Nuclear Physics / Experimental Halls / Hall A
Funding Source
Proprietary? No
This publication conveys Technical Science Results
Document Numbers
JLAB Number: JLAB-PHY-10-1138 OSTI Number: 978833
LANL Number: arXiv:1108.4441 Other Number: DOE/OR/23177-1138
Associated with an experiment Yes
Experiment Number(s)
E08-007
Associated with EIC No
Supported by Jefferson Lab LDRD Funding No
Thesis
Thesis Type PhD
Advisor Institution
1. William Bertozzi MIT
Attachments/Datasets/DOI Link
Document(s)
xiaohui_thesis.pdf (STI Document)
Dataset(s) (none)
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