The proton form factor ratio at low Q2: New results from Jefferson Lab

G. Ron

doi:https://doi.org/10.1142/S0217732311037029

The proton form factor ratio at low Q²: New results from Jefferson Lab

G. Ron

Racah Institute of Physics

The Hebrew University of Jerusalem

Research output: Contribution to journal › Article › peer-review

Abstract

Recently an experiment at Jefferson Lab has measured the proton form factor ratio, μP G_E^p/G_M^p. down to Q² ∼ 0.3 GeV² with unprecedented precision. Based on the results from this experiment, a re-analysis was carried out for the world data on proton form factors, and a new result was extracted for the proton charge radius. The new result is consistent with published CODATA results and is at odds with the new muonic hydrogen measurement at PSI. We present the results of the new measurement, as well as discuss an upcoming experiment to measure the form factor ratio down to even lower Q².

Original language	English
Pages (from-to)	2605-2614
Number of pages	10
Journal	Modern Physics Letters A
Volume	26
Issue number	35
DOIs	https://doi.org/10.1142/S0217732311037029
State	Published - 20 Nov 2011

Keywords

Form factors
charge radius

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Nuclear and High Energy Physics
General Physics and Astronomy

Access to Document

https://doi.org/10.1142/S0217732311037029

Cite this

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title = "The proton form factor ratio at low Q2: New results from Jefferson Lab",

abstract = "Recently an experiment at Jefferson Lab has measured the proton form factor ratio, μP GEp/GMp. down to Q2 ∼ 0.3 GeV2 with unprecedented precision. Based on the results from this experiment, a re-analysis was carried out for the world data on proton form factors, and a new result was extracted for the proton charge radius. The new result is consistent with published CODATA results and is at odds with the new muonic hydrogen measurement at PSI. We present the results of the new measurement, as well as discuss an upcoming experiment to measure the form factor ratio down to even lower Q2.",

keywords = "Form factors, charge radius",

author = "G. Ron",

note = "Funding Information: This work was supported by the U.S. Department of Energy, including contract DE-AC02-06CH11357, the U.S. National Science Foundation, the Israel Science Foundation, the Korea Research Foundation, the US-Israeli Bi-National Scientific Foundation, and the Rothschild Fellowship Program of the Israel Academy of Sciences and Humanities. Jefferson Science Associates operates the Thomas Jefferson National Accelerator Facility under DOE contract DE-AC05-06OR23177.",

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