Recent results for the cross section of electron-positron annihilation into hadrons and for the decay rates of the Z-boson and the τ -lepton into hadrons including corrections of order α 4 s are reviewed. The consistency between two values of αs measured at vastly different energies constitutes a st
Precise strength of the πNN coupling constant
✍ Scribed by T.E.O. Ericson; B. Loiseau; J. Rahm; J. Blomgren; N. Olsson; A.W. Thomas
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 232 KB
- Volume
- 654
- Category
- Article
- ISSN
- 0375-9474
No coin nor oath required. For personal study only.
✦ Synopsis
We report here a preliminary value for the 7rNN coupling constant deduced from the Goldberger-Miyazawa-Oehme sum rule for forward 7rN scattering. As in our previous determination from np backward differential scattering cross sections we give a critical discussion of the analysis with careful attention not only to the statistical, but also to the systematic uncertainties. Our preliminary evaluation gives g~ --13.99(24).
📜 SIMILAR VOLUMES
We have developed a model for the NN --~ NNTrcr reaction and evaluated cross sections for the different charged channels. The low energy part of those channels where the pions can be in an isospin zero state is dominated by N\* excitation, driven by an isoscalar source recently found experimentally,