arXiv 0903.29802009-03hep-ph

LHC的正向物理学

Forward Physics at the LHC

A. D. Martin, M. G. Ryskin, V. A. Khoze

备注：: 34 pagers, 16 figures; based on a talk by Alan Martin at the Cracow Epiphany Conference on ``Hadron interactions at the dawn of the LHC, 5-7 January 2009; dedicated to the memory of Jan Kwiecinski, to be published in Acta Physica Polonica, new subsection 3.5 added
发表信息：: Acta Phys.Polon.B40:1841-1876,2009

摘要：

我们回顾两个相互关联的主题。首先，我们考虑“软”散射观测量的行为，如sigma_{tot}，dsigma_{el} /dt，dsigma_{SD} /dtdM ^2，粒子多重性等，在高能质子-（反）质子对撞机上。我们强调吸收对高能“软”过程的相当大的影响，因此，在通常的多通道程函描述中包括多坡密子-坡密子相互作用的必要性。我们描述了一个多组分模型，它已被调整到现有的数据在CERN-ISR的Tevatron能量范围内的软过程，因此，允许预测在大型强子对撞机的“软”观测。第二个问题是计算高能对撞机上pp -> p+A+p型互斥过程的速率，其中A是一个重系统。特别是，我们讨论了生存概率的快度间隙（+符号表示）的程函和增强的软再散射效应。在大型强子对撞机的能量下，最热门的情况是A是希格斯玻色子。在Tevatron上，已经对各种系统的衍射产物进行了测量：A是γ-γ介子、双射介子或χ_c介子。我们将观察到的比率与预期进行比较。最后，我们描述了如何预测排他性的过程可能会检查在早期运行的大型强子对撞机。

英文摘要：

We review two inter-related topics. First, we consider the behaviour of "soft" scattering observables, such as sigma_{tot}, dsigma_{el}/dt, dsigma_{SD}/dtdM^2, particle multiplicities etc., at high-energy proton-(anti)proton colliders. We emphasize the sizeable effects of absorption on high-energy `soft' processes, and, hence, the necessity to include multi-Pomeron-Pomeron interactions in the usual multi-channel eikonal description. We describe a multi-component model which has been tuned to the available data for soft processes in the CERN-ISR to Tevatron energy range, and which therefore allows predictions to be made for `soft' observables at the LHC. The second topic concerns the calculation of the rate of exclusive processes of the form pp --> p+A+p at high energy colliders, where A is a heavy system. In particular, we discuss the survival probability of the rapidity gaps (denoted by the + signs) to both eikonal and enhanced soft rescattering effects. At the LHC energy, the most topical case is when A is a Higgs boson. At the Tevatron, measurements have been made for the exclusive diffractive production of various systems: A being either gamma-gamma, dijet, or a chi_c meson. We compare the observed rates with the expectations. Finally, we describe how predictions for exclusive processes may be checked in the early runs of the LHC.

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