Parton-hadron duality in unpolarized and polarized structure functions

Parton-hadron duality in unpolarized and polarized structure functions
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非极化和极化结构函数中的帕子-强子对偶性

DOI:
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发表时间:
2003
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通讯作者:
S. Liuti
S. Liuti
中科院分区:
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文献类型:
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作者:
N. Bianchi;A. Fantoni;S. Liuti

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我们分别利用爱马仕和杰斐逊实验室的数据研究了极化和非极化电子质子散射中的部分子-强子二象性现象。在这两种情况下,我们扩展了一个系统的微扰QCD为基础的分析,在共振区的结构函数的积分。在减去目标质量修正和大的x重化效应之后,我们提取了剩余的功率修正,直到1/Q^2阶。我们发现一个相当大的抑制这些条款的分析使用深非弹性散射数据。这种抑制在极化和非极化数据中表现一致,只有低Q^2极化数据除外,在低Q^2极化数据中仍然存在较大的负的高扭转贡献。可能的情况下产生这种行为进行了讨论。
We study the phenomenon of parton-hadron duality in both polarised and unpolarised electron proton scattering using the HERMES and the Jefferson Lab data, respectively. In both cases we extend a systematic perturbative QCD based analysis to the integrals of the structure functions in the resonance region. After subtracting target mass corrections and large x resummation effects, we extract the remaining power corrections up to order 1/Q^2. We find a sizeable suppression of these terms with respect to analyses using deep inelastic scattering data. The suppression appears consistently in both polarised and unpolarised data, except for the low Q^2 polarised data, where a large negative higher twist contribution remains. Possible scenarios generating this behavior are discussed.