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arXiv 1007.4207hep-ph
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从实验数据中提取与模型无关的S矩阵极点

Model Independent Extraction of S-Matrix Poles from Experimental Data

S. Ceci, M. Korolija, B. Zauner

摘要:

通过将接近共振的数据点分成间隔,并将所有可能的间隔拟合到具有恒定相干添加背景的简单极点,我们获得了大量的收敛拟合。在仔细选择了一组统计约束条件后,我们计算了统计上可接受的结果的谐振极点位置的平均值。我们用这种方法找到Z和N(1440)共振的极点位置,并表明厄普星(11020)质量的新旧测量之间的强烈差异源于厄普星(11020)极点与其Breit-Wigner质量的似是而非的比较。

英文摘要:

By separating data points close to a resonance into intervals, and fitting all possible intervals to a simple pole with constant coherently added background, we obtained a substantial number of convergent fits. After a carefully chosen set of statistical constraints was imposed, we calculated the average of a resonance pole position from the statistically acceptable results. We used this method to find pole positions of Z and N(1440) resonances, and to show that the strong discrepancy between the old and new measurements of the Upsilon(11020) mass stems from specious comparison of the Upsilon(11020) pole with its Breit-Wigner mass.

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