Five-quark components in baryons

Details Five-quark components in baryons Five-quark components in baryons

2010-01-07

arxiv.org/abs/1001.1084v1

Physics

Nuclear Physics

Nuclear Theory

invited plenary talk at the 10th International Conference on Hypernuclear and Strange Particle Physics (HypX09) September 14th

Scientific paper

Evidence has been accumulating for the existence of significant intrinsic non-perturbative five-quark components in various baryons. The inclusion of the five-quark components gives a natural explanation of the excess of $\bar d$ over $\bar u$, significant quark orbital angular momentum in the proton, the problematic mass and decay pattern of the lowest $1/2^-$ baryon nonet, etc.. A breathing mode of $qqq\leftrightarrow qqqq\bar q$ is suggested for the lowest $1/2^-$ baryon octet. Evidence of a predicted member of the new scheme, $\Sigma^*(1/2^-)$ around 1380 MeV, is introduced.

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