dc.creator |
Zhan, X. |
|
dc.creator |
Allada, K. |
|
dc.creator |
Armstrong, D.S. |
|
dc.creator |
Arrington, J. |
|
dc.creator |
Bertozzi, W. |
|
dc.creator |
Boeglin, W. |
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dc.creator |
Chen, J.P. |
|
dc.creator |
Chirapatpimol, K. |
|
dc.creator |
Choi, S. |
|
dc.creator |
Chudakov, E. |
|
dc.creator |
Sarty, Adam James, 1965- |
|
dc.date.accessioned |
2018-06-11T16:24:03Z |
|
dc.date.available |
2018-06-11T16:24:03Z |
|
dc.date.issued |
2011-11-03 |
|
dc.identifier.issn |
0370-2693 |
|
dc.identifier.uri |
http://library2.smu.ca/handle/01/27550 |
|
dc.description |
Publisher's Version/PDF |
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dc.description.abstract |
We report a new, high-precision measurement of the proton elastic form factor ratio μ<sub>p</sub>G<sub>E</sub>/G<sub>M</sub> for the four-momentum transfer squared Q<sup>2</sup> = 0.3–0.7 (GeV/c)<sup>2</sup>. The measurement was performed at Jefferson Lab (JLab) in Hall A using recoil polarimetry. With a total uncertainty of approximately 1%, the new data clearly show that the deviation of the ratio μ<sub>p</sub>G<sub>E</sub>/G<sub>M</sub> from unity observed in previous polarization measurements at high Q<sup>2</sup> continues down to the lowest Q<sup>2</sup> value of this measurement. The updated global fit that includes the new results yields an electric (magnetic) form factor roughly 2% smaller (1% larger) than the previous global fit in this Q<sup>2</sup> range. We obtain new extractions of the proton electric and magnetic radii, which are ⟨r<sup>2</sup><sub>E</sub>⟩<sup>1/2</sup> = 0.875 ± 0.010 fm and ⟨r<sup>2</sup><sub>M</sub>⟩<sup>1/2</sup> = 0.867 ± 0.020 fm. The charge radius is consistent with other recent extractions based on the electron–proton interaction, including the atomic hydrogen Lamb shift measurements, which suggests a missing correction in the comparison of measurements of the proton charge radius using electron probes and the recent extraction from the muonic hydrogen Lamb shift. |
en_CA |
dc.description.provenance |
Submitted by Betty McEachern (betty.mceachern@smu.ca) on 2018-06-11T16:24:03Z
No. of bitstreams: 1
Sarty_Adam_J_article_2011_c.pdf: 240250 bytes, checksum: a4d0ce5d1f7dd1e0be939ea04b8d7605 (MD5) |
en |
dc.description.provenance |
Made available in DSpace on 2018-06-11T16:24:03Z (GMT). No. of bitstreams: 1
Sarty_Adam_J_article_2011_c.pdf: 240250 bytes, checksum: a4d0ce5d1f7dd1e0be939ea04b8d7605 (MD5)
Previous issue date: 2011-11-03 |
en |
dc.language.iso |
en |
en_CA |
dc.publisher |
Elsevier Science B.V. |
en_CA |
dc.rights |
Creative Commons Attribution License |
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dc.subject.lcsh |
Protons |
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dc.subject.lcsh |
Form factor (Nuclear physics) |
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dc.subject.lcsh |
Elasticity |
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dc.subject.lcsh |
Momentum transfer |
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dc.title |
High-precision measurement of the proton elastic form factor ratio [mu] [subscript p]G[subscript E]/G[subscript M] at low Q[superscript 2] |
en_CA |
dc.type |
Text |
en_CA |
dcterms.bibliographicCitation |
Physics Letters B 705(1/2), 59-64. (2011) |
en_CA |