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arXiv 2305.03424hep-ph
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高能强子相互作用的多通道 U-矩阵模型

A multi-channel U-Matrix model of hadron interaction at high energy

Rami Oueslati

AI总结:

本研究探讨了高能强子相互作用的多通道 U-矩阵模型,发现其与双通道模型拟合效果相当,且 U-矩阵幺正化可能与不相关 pomeron 交换不兼容,并基于最佳拟合对相关截面和宇宙射线数据提供了预测。

摘要:

本项唯象研究通过考虑完整的部分子位形空间和弹性振幅的 $U$-矩阵幺正化方案,探讨了高能强子相互作用的多通道模型,将其与双通道模型进行比较,并考察了最新高能对撞机数据对 $pp$ 和 $p \ar{p}$ 碰撞中各种强子可观测量的最佳拟合的影响。本研究的结果表明,数据可以用多通道模型很好地拟合,并且与双通道模型相比差异微乎其微。特别重要的发现是,$U$-矩阵幺正化很可能与不相关的 pomeron 交换不兼容,正如 $U$-矩阵多通道与 eikonal 双通道描述之间的等价性所表明的那样。基于我们的最佳拟合,提供了对 $ρ$ 参数、双重衍射截面和弹性微分截面的预测。我们阐明了采用多通道模型对当前和未来宇宙射线数据的影响。

英文摘要:

The present phenomenological study investigates a multi-channel model of high-energy hadron interactions by considering a full parton configurations space and the $U$-matrix unitarisation scheme of the elastic amplitude, comparing it to the two-channel model, and examining the consequences of up-to-date high-energy collider data on the best fits to various hadronic observables in $pp$ and $p \bar{p}$ collisions. The findings of this study reveal that the data are well-fitted with the multi-channel model and that the difference compared to the two-channel one is negligible. Of particular significance is the observation that the $U$-matrix unitarisation is likely incompatible with uncorrelated pomeron exchange, as suggested by the equivalence between the $U$-matrix multi-channel and eikonal two-channel descriptions. Based on our best fit, predictions for the $ρ$ parameter, the double diffractive cross-section, and the elastic differential cross-section are provided. We shed light on the effect of taking into account a multi-channel model on present and future cosmic ray data.

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