π π振幅分析中的一次和两次相减色散关系
Once and twice subtracted dispersion relations in the analysis of pi pi amplitudes
摘要:
分析比较了一次相减和两次相减交叉对称色散关系在$ππ\to ππ$散射数据中的应用。这两组色散关系可以用来测试低分波的$ππ$振幅高达约1 GeV。我们展示了如何一次减去色散关系可以提供更强的约束$ππ$振幅比两次减去在400至1100兆电子伏的范围内,给定相同的实验输入。
英文摘要:
Once and twice subtracted crossing symmetric dispersion relations applied to $ππ\to ππ$ scattering data are analyzed and compared. Both sets of dispersion relations can be used to test the $ππ$ amplitudes in low partial waves up to about 1 GeV. We show how once subtracted dispersion relations can provide stronger constraints for $ππ$ amplitudes than twice subtracted ones in the 400 to 1100 MeV range, given the same experimental input.
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