标题： 全息QCD中的核子电极化率和磁极化率 显示英文标题

标题： Nucleon electric and magnetic polarizabilities in Holographic QCD

摘要： 我们分析了广义Baldin求和规则的共振贡献，即广义电核磁核极化率 $\alpha_E(Q^2)$ 和 $\beta_M(Q^2)$ 的总和，在由Witten、Sakai和Sugimoto（WSS）提出的全息QCD模型中。 特别是，我们考虑了自旋为1/2和3/2且具有两种宇称的第一组低能核共振的贡献。 在将WSS模型参数外推以拟合重子可观测量的实验数据后，我们将我们的结果与文献中的替代预测进行了比较，发现它们在定性上一致。 此外，至少对于质子的情况（有可用数据），我们的结果在定性上与从实验提取的核共振螺旋振幅得到的共振贡献相符。 显示英文摘要

摘要： We analyze the resonance contributions to the generalized Baldin sum rule, namely the sum of the generalized electric and magnetic nucleon polarizabilities $\alpha_E(Q^2)$ and $\beta_M(Q^2)$, within the Holographic QCD model by Witten, Sakai, and Sugimoto (WSS). In particular, we account for the contributions from the first low-lying nucleon resonances with spin 1/2 and 3/2 and both parities. After having extrapolated the WSS model parameters to fit experimental data on baryonic observables, we compare our findings with alternative predictions in literature, finding a qualitative agreement with all of them. Moreover, at least for the proton case, where data are available, our results are in qualitative accordance with resonance contributions extracted from experimental nucleon-resonance helicity amplitudes.