How precisely can we determine the pion-nucleon coupling constant from the isovector GMO sum rule? - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Conference Papers Pi N Newsletter Year : 1999

How precisely can we determine the pion-nucleon coupling constant from the isovector GMO sum rule?

Abstract

The isovector GMO sum rule for zero energy forward pion-nucleon scattering is critically studied to obtain the charged pion-nucleon coupling constant using the precise negatively charged pion-proton and pion-deuteron scattering lengths deduced recently from pionic atom experiments. This direct determination leads to a pseudoscalar charged pion-nucleon coupling constant of 14.23 +- 0.09 (statistic) +- 0.17 (systematic). We obtain also accurate values for the pion-nucleon scattering lengths.

Dates and versions

in2p3-00086139 , version 1 (18-07-2006)

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Cite

B. Loiseau, T. E. O. Ericson, A. W. Thomas. How precisely can we determine the pion-nucleon coupling constant from the isovector GMO sum rule?. Eighth International Symposium on Meson-Nucleon Physics and the Structure of the Nucleon, Aug 1999, Zuoz, Switzerland. pp.162-166. ⟨in2p3-00086139⟩
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