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arXiv 2201.06495nucl-thhep-exhep-phnucl-ex
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单π介子对Gerasimov-Drell-Hearn求和规则及相关积分的贡献

Single-pion contribution to the Gerasimov--Drell--Hearn sum rule and related integrals

Igor Strakovsky, Simon Širca, William J. Briscoe, Alexandre Deur, Axel Schmidt, Ron L. Workman

摘要:

在单π介子光生的分波分析(PWA)中获得的唯象振幅被用来评估这一过程的Gerasimov-Drell-Hearn(GDH),Baldin和Gell-Mann-Goldberger-Thirring(GGT)和规则的贡献,通过整合高达2 GeV的光子能量。我们的研究证实,所有这些总和规则的贡献,甚至在最高考虑光子能量收敛,但饱和的水平是非常不同的三种情况下。单π介子的产生几乎饱和了质子的GDH求和规则,而在中子的情况下,很大一部分是缺失的。质子和中子的巴尔丁积分都饱和到预测总强度的五分之四左右。对于GGT求和规则,预测的广泛变异性排除了任何明确的陈述。

英文摘要:

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.

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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