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arXiv 0708.2833hep-ph
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最低阶硬散射中完全不可积部分子关联函数与因子分解

Fully Unintegrated Parton Correlation Functions and Factorization in Lowest Order Hard Scattering

J. C. Collins, T. C. Rogers, A. M. Staśto

摘要:

出于对微扰QCD的标准公式中所用近似中潜在的大的运动学误差进行修正的需要,我们用规范不变的、依赖于部分子四动量的普适的部分子关联函数重新表述了深度非弹性轻子-质子散射.目前,不同的硬QCD过程被描述为非常不同的微扰形式,每一个依赖于自己的一套运动学近似。在本文中,我们展示了如何建立避免对最终状态动量进行近似的形式主义,因此具有非常广泛的适用范围。精确运动学的使用引入了一些重要的概念转变已经在领先的顺序,并严格约束的形式主义。我们展示了如何定义部分子关联函数,推广了部分子密度,碎裂函数和软因子的概念。在建立了一般的减法形式之后,我们得到了一个因式分解定理。为了避免沃德恒等式的复杂化,完整的推导仅限于阿贝尔规范理论;即使如此,所得的结构高度暗示了对非阿贝尔规范理论的类似处理。

英文摘要:

Motivated by the need to correct the potentially large kinematic errors in approximations used in the standard formulation of perturbative QCD, we reformulate deeply inelastic lepton-proton scattering in terms of gauge invariant, universal parton correlation functions which depend on all components of parton four-momentum. Currently, different hard QCD processes are described by very different perturbative formalisms, each relying on its own set of kinematical approximations. In this paper we show how to set up formalism that avoids approximations on final-state momenta, and thus has a very general domain of applicability. The use of exact kinematics introduces a number of significant conceptual shifts already at leading order, and tightly constrains the formalism. We show how to define parton correlation functions that generalize the concepts of parton density, fragmentation function, and soft factor. After setting up a general subtraction formalism, we obtain a factorization theorem. To avoid complications with Ward identities the full derivation is restricted to abelian gauge theories; even so the resulting structure is highly suggestive of a similar treatment for non-abelian gauge theories.

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