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Excited baryons from the FLIC fermion action

✍ Scribed by W. Melnitchouk; J.N. Hedditch; D.B. Leinweber; A.G. Williams; J.M. Zanotti; J.B. Zhang

Book ID
104354315
Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
274 KB
Volume
119
Category
Article
ISSN
0920-5632

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✦ Synopsis

Masses of positive and negative parity excited nucleons and hyperons are calculated in quenched lattice QCD using an O(a2) improved gluon action and a fat-link clover fermion action in which only the irrelevant operators are constructed with fat links. The results are in agreement with earlier N* simulations with improved actions, and exhibit a clear mass splitting between the nucleon and its parity partner, as well as a small mass splitting between the two low-lying Jp = f-N" states. Study of different A interpolating fields suggests a similar splitting between the lowest two $-A* states, although the empirical mass suppression of the A*( 1405) is not seen.

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