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    Please use this identifier to cite or link to this item: http://nccur.lib.nccu.edu.tw/handle/140.119/77985

    Title: Nonlocal condensate model for QCD sum rules
    Authors: Hsieh, Ron-Chou;Li, Hsiang-nan
    Contributors: 應物所
    Keywords: QCD sum rules;Nonlocal condensate;Dressed propagator
    Date: 2011-04
    Issue Date: 2015-08-24 15:55:41 (UTC+8)
    Abstract: We include effects of nonlocal quark condensates into QCD sum rules (QSR) via the Källén–Lehmann representation for a dressed fermion propagator, in which a negative spectral density function manifests their nonperturbative nature. Applying our formalism to the pion form factor as an example, QSR results are in good agreement with data for momentum transfer squared up to Q2≈10 GeV2Q2≈10 GeV2. It is observed that the nonlocal quark condensate contribution descends like 1/Q21/Q2, different from the exponential decrease in Q2Q2 obtained in the literature, and contrary to the linear rise in the local-condensate approximation.
    Relation: Physics Letters B, 698(2), 140-145
    Data Type: article
    DOI 連結: http://dx.doi.org/10.1016/j.physletb.2011.02.056
    DOI: 10.1016/j.physletb.2011.02.056
    Appears in Collections:[應用物理研究所 ] 期刊論文

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