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arXiv 2212.04795nucl-thhep-phnucl-ex
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核靶下的 Gerasimov-Drell-Hearn 求和规则

The Gerasimov-Drell-Hearn sum-rule with nuclear targets

Steven D. Bass, Paolo Pedroni, Andreas Thomas

AI总结:

本文研究了核介质中极化核子光致产生的 GDH 求和规则,预期介质效应会增强该求和规则,且现有极化氘核和 $^3$He 数据显示 $Δ$ 激发能量发生偏移。

摘要:

强子嵌入核介质时其性质会发生改变。本文讨论了在极化核靶内,极化核子光致产生过程的 Gerasimov-Drell-Hearn (GDH) 求和规则。预期在介质中,随着质子与核子共振质量的抑制以及质子反常磁矩的增强,该效应将出现强烈增强。这可通过极化光致产生实验进行检验,感兴趣的极化靶包括氘核、$^3$He、$^6$Li 和 $^7$Li。对 GDH 求和规则的最大贡献来自 $Δ$ 共振激发。在现有的极化氘核和 $^3$He 数据中,与使用自由质量处理 $Δ$ 的模型预测相比,$Δ$ 激发向略低的能量偏移。

英文摘要:

Hadron properties are modified when the hadron is embedded in a nuclear medium. Here we discuss the Gerasimov-Drell-Hearn, GDH, sum rule for polarised photoproduction from a polarised nucleon within a polarised nuclear target. Strong enhancement is expected with the suppression of the proton and nucleon resonance masses and enhancement of the proton's anomalous magnetic moment in medium. This could be tested in polarised photoproduction experiments with interesting targets being polarised deuterons, $^3$He, $^6$Li and $^7$Li. The largest contribution to the GDH sum rule comes from the $Δ$ resonance excitation. In existing data with polarised deuterons and $^3$He the $Δ$ excitation is shifted to slightly lower energy when compared to model predictions where the $Δ$ is treated with its free mass.

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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