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arXiv 1602.05068hep-phhep-exnucl-exnucl-th
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第三共振区重子电磁结构的相对论模型

A Relativistic Model for the Electromagnetic Structure of Baryons from the 3rd Resonance Region

G. Ramalho

备注：
Proceedings of the ECT* Workshop "Nucleon Resonances: From Photoproduction to High Photon Virtualities", October 12-16, 2015, Trento, Italy. Final version. 9 pages, 6 figures, 2 tables. arXiv admin note: text overlap with arXiv:1509.08436
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摘要：

我们提出了一些预测的$γ^\ast N \to N^\ast$跃迁振幅，其中$N$是核子，和$N^\ast$是核子激发从第三共振区。首先，我们估计与核子的第二径向激发，解释为$N(1710)$状态，使用协变旁观夸克模型的过渡振幅。在此基础上，我们将协变旁观夸克模型的一些结果与单夸克跃迁模型的框架相结合，对$γ^\ast N \to N^\ast$跃迁振幅进行了预言，其中$N^\ast$是$SU(6)$多重态$[70,1^-]$的一员. $γ^\ast N \to N(1520)$和$γ^\ast N \to N(1535)$跃迁振幅的结果用作计算与$γ^\ast N \to N(1650)$、$γ^\ast N \to N(1700)$、$γ^\ast N \to Δ(1620)$和$γ^\ast N \to Δ(1700)$跃迁相关的振幅$A_{1/2}$、$A_{3/2}$的输入。我们的估计与现有数据进行了比较。为了便于与未来的实验数据在高$Q^2$的比较，我们也推导出简单的参数化的振幅，兼容的预期在高$Q^2$的下降。

英文摘要：

We present some predictions for the $γ^\ast N \to N^\ast$ transition amplitudes, where $N$ is the nucleon, and $N^\ast$ is a nucleon excitation from the third resonance region. First we estimate the transition amplitudes associated with the second radial excitation of the nucleon, interpreted as the $N(1710)$ state, using the covariant spectator quark model. After that, we combine some results from the covariant spectator quark model with the framework of the single quark transition model, to make predictions for the $γ^\ast N \to N^\ast$ transition amplitudes, where $N^\ast$ is a member of the $SU(6)$-multiplet $[70,1^-]$. The results for the $γ^\ast N \to N(1520)$ and $γ^\ast N \to N(1535)$ transition amplitudes are used as input to the calculation of the amplitudes $A_{1/2}$, $A_{3/2}$, associated with the $γ^\ast N \to N(1650)$, $γ^\ast N \to N(1700)$, $γ^\ast N \to Δ(1620)$, and $γ^\ast N \to Δ(1700)$ transitions. Our estimates are compared with the available data. In order to facilitate the comparison with future experimental data at high $Q^2$, we derived also simple parametrizations for the amplitudes, compatible with the expected falloff at high $Q^2$.

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