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arXiv 1401.4067hep-exhep-ph
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191 GeV/c π^-p中ηπ^-和π 'π ^-的奇、偶分波

Odd and Even Partial Waves of ηπ^- and η'π^- in 191 GeV/c π^-p

T. Schlüter

摘要:

在2008年,COMPASS记录了签名为π^-(191 GeV)p --> X_fast p的衍射事件。我们给出了子系统X = η(')π^-的分析结果。除了已知的共振态a_2(1320),a_4(2040)外,我们还研究了自旋奇异P ~+波以及自旋J = 6以下的所有自然交换分波的性质。我们发现这两个末态之间有一个显著的区别:在两个系统中,偶分波J = 2,4,6与相空间因子有关,而在ηπ^-系统中,奇分波相对被抑制。偶数波之间的相对相位看起来是相同的,而D波和P波之间的相位表现得非常不同,这表明在两个奇数角动量系统中有不同的共振和非共振贡献。测量了已知共振a_2和a_4的分支比和参数。

英文摘要:

In the year 2008 COMPASS recorded diffractive events of the signature π^-(191 GeV) p --> X_fast p. We present results of the analysis of the subsystems X = η(')π^-. Besides the known resonances a_2(1320), a_4(2040), we study the properties of the spin-exotic P+ wave, and all other natural-exchange partial waves up to spin J = 6. We find a striking difference between the two final states: whereas the even partial waves J = 2, 4, 6 in the two systems are related by phase-space factors, the odd partial waves are relatively suppressed in the ηπ^- system. The relative phases between the even waves appear identical whereas the phase between the D and P waves behave quite differently, suggesting different resonant and non-resonant contributions in the two odd-angular-momentum systems. Branching ratios and parameters of the well-known resonances a_2 and a_4 are measured.

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