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  • 标题:Excited state Effects in Nucleon Matrix Element Calculations
  • 本地全文:下载
  • 作者:C. Alexandrou ; M. CONSTANTINOU ; S. Dinter
  • 期刊名称:PoS - Proceedings of Science
  • 印刷版ISSN:1824-8039
  • 出版年度:2011
  • 卷号:2011
  • 期号:Lattice2011
  • 出版社:SISSA, Scuola Internazionale Superiore di Studi Avanzati
  • 摘要: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 gA and for the first moment of the isovector unpolarized parton distribution hxiu􀀀d. In addition, we report on preliminary results using the generalized eigenvalue method for nucleon matrix elements. All calculations are performed using Nf = 2+1+1 maximally twisted mass Wilson fermions.
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