Excited Baryons in Lattice QCD

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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 ... continued below

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243 Kilobytes pages

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Melnitchouk, W.; Bilson-Thompson, S.; Bonnet, F.; F.X.Lee; D.B.Leinweber; A.G.Williams et al. March 1, 2002.

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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.

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243 Kilobytes pages

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  • Report No.: JLAB-THY-01-36
  • Report No.: DOE/ER/40150-2025
  • Report No.: hep-lat/0202022
  • Grant Number: AC05-84ER40150
  • Office of Scientific & Technical Information Report Number: 792660
  • Archival Resource Key: ark:/67531/metadc735396

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  • March 1, 2002

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  • Oct. 19, 2015, 7:39 p.m.

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  • Feb. 5, 2016, 9:28 p.m.

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Melnitchouk, W.; Bilson-Thompson, S.; Bonnet, F.; F.X.Lee; D.B.Leinweber; A.G.Williams et al. Excited Baryons in Lattice QCD, article, March 1, 2002; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc735396/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.