Determination of the charged pion-nucleon coupling constant from p → n differential cross-section
نویسندگان
چکیده
منابع مشابه
Determination of the pion-nucleon coupling constant and scattering lengths
We critically evaluate the isovector Goldberger-Miyazawa-Oehme ~GMO! sum rule for forward pN scattering using the recent precision measurements of pp and pd scattering lengths from pionic atoms. We deduce the charged-pion-nucleon coupling constant, with careful attention to systematic and statistical uncertainties. This determination gives, directly from data, gc ~GMO!/4p514.1160.05~statistical...
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A review is given of the various determinations of the different πNN coupling constants in analyses of the low-energy pp, np, pp, and πp scattering data. The most accurate determinations are in the energy-dependent partial-wave analyses of the NN data. The recommended value is f 2 = 0.075. A recent determination of f 2 by the Uppsala group from backward np cross sections is shown to be model de...
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The latest πN elastic scattering data are re-analysed to determine the coupling constant gc of the charged pion, using the dispersion relation for the invariant amplitude B(+). Depending on the choice of data-base, values g2 c/4π = 13.80 to 13.65 are obtained with errors of ±0.12. We re-examine the well known discrepancy with the Goldberger-Treiman relation. After allowing for the mass dependen...
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The pion-nucleon coupling constant gπN is studied on the basis of the QCD sum rules. Both the Borel sum rules and the finite energy sum rules for gπN are used to examine the effects of higher dimensional operators (up to dim. 7) and αs corrections in the operator product expansion. Agreement with the experimental number is reached only when Sπ/SN is greater than one, where Sπ (SN ) is the conti...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1995
ISSN: 0370-2693
DOI: 10.1016/0370-2693(94)01565-t