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arXiv 0905.1955hep-ph
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pp和ppbar散射库仑干涉区的振幅

Amplitudes in the Coulomb interference region of pp and ppbar scattering

Anderson Kendi, Erasmo Ferreira, Takeshi Kodama

摘要:

讨论了库仑干涉区散射描述中pp和ppbar振幅参数的确定。我们提出了在微分截面中观察到的有效斜率是由实振幅和虚振幅(称为B_R和B_I)的不同指数斜率形成的可能性。为了这个目的,我们开发了一个更一般的治疗库仑相。我们用四个参数(sigma,rho,B_I,B_R)分析了19 ~ 1800 GeV范围内的微分截面数据,观察到我们不能从数据中得到参数的唯一确定。我们调查的四个数量对的相关性,显示范围导致较小的卡方值。在541 GeV的p-pbar散射的特定情况下,我们调查事件率dN/dt的测量在低|t|的库仑干涉与指数下降的核振幅。该分析允许确定将事件率与绝对截面连接的归一化因子。

英文摘要:

We discuss the determination of the parameters of the pp and ppbar amplitudes for the description of scattering in the Coulomb interference region. We put enphasis on the possibility that the effective slope observed in the differential cross section is formed by different exponential slopes in the real and imaginary amplitudes (called B_R and B_I). For this purpose we develop a more general treatment of the Coulomb phase. We analyse the differential cross section data in the range from 19 to 1800 GeV with four parameters (sigma , rho, B_I, B_R), and observe that we cannot obtain from the data a unique determination of the parameters. We investigate correlations in pairs of the four quantities, showing ranges leading to the smaller chi2 values. In the specific case of p-pbar scattering at 541 GeV, we investigate the measurements of event rate dN/dt at low |t| in terms of the Coulomb interference with exponentially decreasing nuclear amplitudes. The analysis allows a determination of the normalization factor connecting the event rate with the absolute cross section.

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