Excited State Effects in Nucleon Matrix Element Calculations

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We perform a high-statistics precision calculation of nucleon matrix elements using an open sink method allowing us to explore a wide range of sink-source time separations. In this way the influence of excited states of nucleon matrix elements can be studied. As particular examples we present results for the nucleon axial charge g{sub A} and for the first moment of the isovector unpolarized parton distribution x{sub u-d}. In addition, we report on preliminary results using the generalized eigenvalue method for nucleon matrix elements. All calculations are performed using N{sub f} = 2+1+1 maximally twisted mass Wilson fermions.

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Constantia Alexandrou, Martha Constantinou, Simon Dinter, Vincent Drach, Karl Jansen, Theodoros Leontiou, Dru B Renner December 1, 2011.

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We perform a high-statistics precision calculation of nucleon matrix elements using an open sink method allowing us to explore a wide range of sink-source time separations. In this way the influence of excited states of nucleon matrix elements can be studied. As particular examples we present results for the nucleon axial charge g{sub A} and for the first moment of the isovector unpolarized parton distribution x{sub u-d}. In addition, we report on preliminary results using the generalized eigenvalue method for nucleon matrix elements. All calculations are performed using N{sub f} = 2+1+1 maximally twisted mass Wilson fermions.

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150

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  • Journal Name: PoS(LATTICE2011); Conference: Lattice 2011 - The 29th International Symposium on Lattice Field Theory, July 11-16, 2011, Lake Tahoe, CA

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  • Report No.: JLAB-THY-12-1410
  • Report No.: DOE/OR/23177-1945
  • Report No.: arXiv:1112.2931
  • Grant Number: AC05-06OR23177
  • Office of Scientific & Technical Information Report Number: 1043047
  • Archival Resource Key: ark:/67531/metadc833503

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  • December 1, 2011

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  • May 19, 2016, 3:16 p.m.

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  • Aug. 3, 2016, 6:26 p.m.

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Constantia Alexandrou, Martha Constantinou, Simon Dinter, Vincent Drach, Karl Jansen, Theodoros Leontiou, Dru B Renner. Excited State Effects in Nucleon Matrix Element Calculations, article, December 1, 2011; Newport News, Virginia. (digital.library.unt.edu/ark:/67531/metadc833503/: accessed September 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.