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arXiv 1409.5250hep-ph
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光锥QCD中的$γ^\ast N \to N^\ast (1520)$转变形状因子

$γ^\ast N \to N^\ast (1520)$ transition form factors in light cone QCD

T. M. Aliev, M. Savci

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18 pages, 3 figures, LaTeX formatted
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摘要：

在光锥QCD求和规则框架下研究了$γ^\ast N \to N^\ast (1520)$反应。导出了多极形状因子的求和规则，即磁偶极$G_M(Q^2)$、电四极$G_E(Q^2)$和库仑四极$G_C(Q^2)$的形状因子对$γ^\ast N \to N^\ast (1520)$跃迁的贡献.利用这些求和规则，螺旋度振幅被表示为这些多极形状因子的组合，并研究了它们的$Q^2$依赖性。我们比较我们的结果与观众模型预测的螺旋度振幅，并与现有的实验数据。

英文摘要：

The $γ^\ast N \to N^\ast (1520)$ reaction is studied in framework of the light cone QCD sum rules method. The sum rules for the multipole form factors, namely, for the magnetic dipole $G_M(Q^2)$, electric quadrupole $G_E(Q^2)$, and Coulomb quadrupole $G_C(Q^2)$, form factors responsible for for the $γ^\ast N \to N^\ast (1520)$ transition are derived. Using these sum rules, the helicity amplitudes are presented as the combinations of these multipole form factors, and their $Q^2$ dependences are studied. We compare our results on the helicity amplitudes with those of the spectator model predictions, and with the existing experimental data.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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