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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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