论文标题
对Gerasimov的单杆贡献-Drell- Hear-nn和相关的积分
Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals
论文作者
论文摘要
单杆-PION光生生产的部分波分析（PWA）获得的现象学幅度用于评估该过程对Gerasimov-Drell-Hearn（GDH），Baldin和Gell-Mann-Goldberger-thirring（GGT）总和（GGT）总和规则，通过将大约2 GEV In Phots On Photon Enternement In Phots Onsement。我们的研究证实，即使在最高考虑的光子能量之前，对所有这些总规则的单杆贡献也会收敛，但是在三种情况下，饱和度的水平大不相同。单杆型产生几乎使质子的GDH总规则饱和，而中子情况下缺少大量的质量。质子和中子的鲍尔丁积分均饱和到预测总强度的四分之三。对于GGT和规则，预测的广泛可变性排除了任何确定的陈述。
Phenomenological amplitudes obtained in partial-wave analyses (PWA) of single-pion photoproduction are used to evaluate the contribution of this process to the Gerasimov-Drell-Hearn (GDH), Baldin and Gell-Mann-Goldberger-Thirring (GGT) sum rules, by integrating up to 2 GeV in photon energy. Our study confirms that the single-pion contribution to all these sum rules converges even before the highest considered photon energy, but the levels of saturation are very different in the three cases. Single-pion production almost saturates the GDH sum rule for the proton, while a large fraction is missing in the neutron case. The Baldin integrals for the proton and the neutron are both saturated to about four fifths of the predicted total strength. For the GGT sum rule, the wide variability in predictions precludes any definitive statement.
