Excited Baryons in Lattice QCD
Journal Article
·
OSTI ID:792660
We present first results of calculations of masses of positive and negative parity excited baryons in lattice QCD using an O(a{sup 2}) 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 calculations of N* resonances using improved actions and exhibit a clear mass splitting between the nucleon and its chiral partner. The results also indicate a splitting between the lowest J{sup P}=(1/2){sup -} states for the two standard nucleon interpolating fields. The study of different Lambda interpolating fields suggests a similar splitting between the lowest two Lambda{sup 1/2{sup -}} octet states. However, the empirical mass suppression of the Lambda*(1405) is not evident in these quenched QCD simulations, suggesting an important role for the meson cloud of the Lambda*(1405) or a need for more exotic interpolating fields.
- Research Organization:
- Thomas Jefferson National Accelerator Facility, Newport News, VA (US)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 792660
- Report Number(s):
- JLAB-THY-01-36; DOE/ER/40150-2025; hep-lat/0202022
- Country of Publication:
- United States
- Language:
- English
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