THE SUPPRESSION OF πNN(1535) COUPLING IN QCD
نویسندگان
چکیده
منابع مشابه
The suppression of πNN(1535) coupling in QCD
The light cone QCD sum rules are employed to calculate the πNN(1535) coupling gπNN∗ . We study the two point correlation function of two nucleon currents sandwiched between the vacuum and the pion state. The contribution from the excited states and the continuum is subtracted cleanly through the double Borel transform with respect to the nucleon andN(1535) momenta, p1, p 2 2 = (p−q) . Our calcu...
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The πNN∗ and ηNN∗ coupling constants are studied in the QCD sum rule (N∗ ≡ N(1535)). We investigate the two point functions between the vacuum and a one meson state in the soft meson limit. The operator product expansion is explicitly performed up to terms of dimension eight. We find that gπNN∗ vanishes to this order, while gηNN∗ has a finite contribution. The vanishing of gπNN∗ is a rigorous c...
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The πN N * and ηN N * coupling constants are studied in the QCD sum rule (N * ≡ N (1535)). We investigate the two point functions between the vacuum and a one meson state in the soft meson limit, extracting the contributions from N (1535) in the way we have formulated previously. The operator product expansion is performed up to the terms of dimension eight. We find that g πN N * vanishes to th...
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ژورنال
عنوان ژورنال: Modern Physics Letters A
سال: 1998
ISSN: 0217-7323,1793-6632
DOI: 10.1142/s021773239800293x