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arXiv 1306.0452hep-ph
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从光学点到通过倾斜的弹性pp散射:从ISR到LHC的经验参数化

Elastic pp scattering from the optical point to past the dip: an empirical parametrization from ISR to LHC

Daniel A. Fagundes, Agnes Grau, Simone Pacetti, Giulia Pancheri, Yogendra N. Srivastava

摘要:

我们描述了最近的LHC弹性PP散射数据的主要特点,通过一个简单的参数化的振幅,由Barger和Phillips在1973年提出的模型,包括两个指数的相对相位的启发。尽管它的简单,这个参数化再现两个基本方面的弹性微分截面,众所周知的陡峭的下降,在向前的方向和一个尖锐的“倾角”结构。为了包括对接近t=0的数据集的完整描述,我们校正了原始的参数化。我们研究了两种可能性,存在的两π阈值奇异性或反映质子形状因子的乘法因子。在这两种情况下,我们都找到了LHC7和ISR数据的良好描述。形状因子模型允许通过碰撞参量空间中的渐近定理和渐近求和规则对更高能量进行简单预测。我们提出了在更高的LHC能量,这可以用来测试是否达到渐近模型的预测。在这个模型中,只有在能量接近10^6 TeV时才能达到黑盘极限。

英文摘要:

We describe the main features of recent LHC data on elastic pp scattering through a simple parametrization to the amplitude, inspired by a model proposed by Barger and Phillips in 1973, comprising of two exponentials with a relative phase. Despite its simplicity, this parameterization reproduces two essential aspects of the elastic differential cross section, the well known precipitous descent in the forward direction and a sharp `dip' structure. To include a complete description of data sets near -t=0, we correct the original parametrization. We examine two possibilities, the presence of the two-pion threshold singularity or a multiplicative factor reflecting the proton form factor. We find good descriptions of LHC7 and ISR data in either case. The form factor model allows simple predictions for higher energies through asymptotic theorems and asymptotic sum rules in impact parameter space. We present predictions for this model at higher LHC energies, which can be used to test whether asymptotia is reached. The black disk limit in this model is seen to be reached only for energies near 10^6 TeV.

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