The small axial charge of the N(1535)-resonance |
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Authors: | C S An D O Riska |
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Institution: | (1) Institute of High Energy Physics, CAS, P.O. Box 918, 10049 Beijing, China;(2) Helsinki Institute of Physics, University of Helsinki, Helsinki, POB 64, 00014, Finland |
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Abstract: | There is a natural cancellation between the contributions of the qqq and qqqq
components to the axial charge of the N(1535)-resonance. While the probability of the former is larger than that of the latter, its coefficient in the axial charge
expression is exceptionally small. The magnitude of two of the corresponding coefficients of the qqqq
components is in contrast large and has the opposite sign. This result provides a phenomenological illustration of the recent
unquenched lattice calculation result that the axial charge of the N(1535)-resonance is very small, if not vanishing (T.T.
Takahashi, T. Kunihiro, arXiv: 0801.4707 hep-lat]). The result sets an upper limit on the magnitude of the probability of
qqqq
components as well. |
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Keywords: | PACS" target="_blank">PACS 12 39 Jh Nonrelativistic quark model 14 20 Gk Baryon resonances with S = 0 |
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