Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/11101
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Type: Journal article
Title: The GMO sumrule and thepNN coupling constant
Author: Ericson, T.
Loiseau, B.
Thomas, A.
Citation: Physica Scripta: an international journal for experimental and theoretical physics, 2000; T87(1):71-77
Publisher: Royal Swedish Acad Sciences
Issue Date: 2000
ISSN: 0281-1847
1402-4896
Statement of
Responsibility: 
T E O Ericson, B Loiseau and A W Thomas
Abstract: The isovector GMO sumrule for forward πN scattering is critically evaluated using the precise π-p and π-d scattering lengths obtained recently from pionic atom measurements. The charged πNN coupling constant is then deduced with careful analysis of systematic and statistical sources of uncertainties. This determination gives directly from data gc2(GMO)/4π = 14.17±0.09 (statistic) ±0.17 (systematic) or fc2/ 4π = 0.078(11). This value is half-way between that of indirect methods (phase-shift analyses) and the direct evaluation from from backward np differential scattering cross sections (extrapolation to pion pole). From the π-p and π-d scattering lengths our analysis leads also to accurate values for (1/2)(aπ-p+aπ-n) and (1/2) (aπ-p-aπ-n).
DOI: 10.1238/Physica.Topical.087a00071
Published version: http://dx.doi.org/10.1238/physica.topical.087a00071
Appears in Collections:Aurora harvest 7
Special Research Centre for the Subatomic Structure of Matter publications

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