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arXiv 0904.3840nucl-th
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单π介子电产生对广义Gerasimov-Drell-Hearn和定则的贡献

Contribution of single pion electroproduction to the generalized Gerasimov-Drell-Hearn sum rule for the deuteron

Alexander Fix, Hartmuth Arenhövel, Mahmoud Tammam

摘要:

广义Gerasimov-Drell-Hearn求和规则的贡献的单π介子生产的氘核显式积分的能量为1.5 GeV的相干和非相干生产进行评估。作为基本的$γ^* N\toπN$振幅,使用了MAID 2003模型。对于非相干产生,最终态相互作用包括在最终$NN$和$πN$子系统中。由此产生的广义横向GDH求和规则的贡献是远远小于负的贡献,从蜕变通道$d(e,e')np$,占主导地位的求和规则在低$Q^2$。

英文摘要:

The generalized Gerasimov-Drell-Hearn sum rule is evaluated for the contribution of single pion production on the deuteron by explicit integration up to an energy of 1.5 GeV for both coherent and incoherent production. As elementary $γ^* N\toπN$ amplitude the MAID2003 model has been used. For incoherent production final state interaction is included in the final $NN$ and $πN$ subsystems. The resulting contribution to the generalized transverse GDH sum rule is considerably smaller than the negative contribution from the disintegration channel $d(e,e')np$ which dominates the sum rule at low $Q^2$.

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