2009年10月30日

# Can the Feynman-Hellmann theorem be used to separate the connected- and disconnected-diagram contributions to the nucleon sigma term ?

• M. Wakamatsu
• ,
• H. Tsujimoto

In recent lattice QCD studies, the Feynman-Hellmann theorem is often used to
estimate separate contributions of the connected and disconnected diagrams to
the nucleon sigma term. We demonstrate through a simple analysis within an
effective model of QCD why this could be dangerous although the theorem is
naturally expected to hold for the sum of the two contributions, i.e. the net
nucleon sigma term.

リンク情報
arXiv
http://arxiv.org/abs/arXiv:0910.5762
Arxiv Url
http://arxiv.org/abs/0910.5762v1
Arxiv Url
http://arxiv.org/pdf/0910.5762v1 本文へのリンクあり

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