High-precision measurement of the proton elastic form factor ratio [mu] [subscript p]G[subscript E]/G[subscript M] at low Q[superscript 2]

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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.
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
dc.description.abstract We report a new, high-precision measurement of the proton elastic form factor ratio &mu;<sub>p</sub>G<sub>E</sub>/G<sub>M</sub> for the four-momentum transfer squared Q<sup>2</sup> = 0.3&ndash;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 &mu;<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 &lang;r<sup>2</sup><sub>E</sub>&rang;<sup>1/2</sup> = 0.875 &plusmn; 0.010 fm and &lang;r<sup>2</sup><sub>M</sub>&rang;<sup>1/2</sup> = 0.867 &plusmn; 0.020 fm. The charge radius is consistent with other recent extractions based on the electron&ndash;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.language.iso en en_CA
dc.publisher Elsevier Science B.V. en_CA
dc.rights Creative Commons Attribution License
dc.subject.lcsh Protons
dc.subject.lcsh Form factor (Nuclear physics)
dc.subject.lcsh Elasticity
dc.subject.lcsh Momentum transfer
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


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