X iv : h ep - p h / 99 07 43 3 v 2 2 3 Ju l 1 99 9 1 Precision determination of the π N scattering lengths and the charged π NN coupling constant
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چکیده
We critically evaluate the isovector GMO sumrule for the charged πNN coupling constant using recent precision data from π − p and π − d atoms and with careful attention to systematic errors. From the π − d scattering length we deduce the pion-proton scattering lengths
منابع مشابه
/ 99 07 43 3 v 1 2 0 Ju l 1 99 9 1 Precision determination of the π N scattering lengths and the charged π NN coupling constant
We critically evaluate the isovector GMO sumrule for the charged πNN coupling constant using recent precision data from π − p and π − d atoms and with careful attention to systematic errors. From the π − d scattering length we deduce the pion-proton scattering lengths
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متن کاملar X iv : h ep - p h / 98 07 39 5 v 1 1 6 Ju l 1 99 8 The low - energy constants of the πN system
Recent analyses of low-energy πN experimental data have provided clear evidence for the violation of the isospin symmetry of the strong interaction. In the present work, it is shown that the single-charge-exchange reaction (π − p → π 0 n) is the culprit for the effect. Given the present experimental uncertainties, no evidence for isospin breaking was found in the two elastic-scattering processe...
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تاریخ انتشار 1999