Comment on piNN Coupling from High Precision np Charge Exchange at 162 MeV

Details Comment on piNN Coupling from High Precision np Charge Exchange at 162 MeV Comment on piNN Coupling from High Precision np Charge Exchange at 162 MeV

1998-12-08

arxiv.org/abs/nucl-th/9812020v1

Phys. Rev. Letters 81, 5253 (1998)

Physics

Nuclear Physics

Nuclear Theory

5 pages, latex2e with a4wide.sty. This is an updated and extended version of the Comment published in Phys. Rev. Letters 81, 5

Scientific paper

10.1103/PhysRevLett.81.5253

In this updated and expanded version of our delayed Comment we show that the np backward cross section, as presented by the Uppsala group, is seriously flawed (more than 25 sd.). The main reason is the incorrect normalization of the data. We show also that their extrapolation method, used to determine the charged piNN coupling constant, is a factor of about 10 less accurate than claimed by Ericson et al. The large extrapolation error makes the determination of the coupling constant by the Uppsala group totally uninteresting.

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