标题： 前动量形式有效QCD作用量的自然强子自由度 显示英文标题

标题： Natural Hadronic Degrees of Freedom for an Effective QCD Action in the Front Form

摘要： 一方面，任何有效的QCD作用量，即$S[\pi,\,\rho,\,\omega,\ldots,N,\,\overline N,\,\Delta^{3/2},\ldots]$，至少在原则上都涉及到所有自旋的介子场的塔状结构；另一方面，场论的前沿形式已成为研究许多系统高能行为的适当框架。 受这些简单考虑的启发，我们提出了一种系统的表述方法，该方法明确提供了构建$S[\pi,\,\rho,\,\omega,\ldots,N,\,\overline N,\,\Delta^{3/2},\ldots]$所需的前沿形式场。此外，构造了一个变换矩阵$\Omega(j)$，它决定了前沿形式的介子场如何叠加以产生更熟悉的瞬时形式场。 前沿形式的介子场的显式结果，直到自旋二，已在附录中列出。 对于自旋一半的情况，$\Omega(1/2)$与著名的“梅洛什变换”一致。 该表述方法，在不明确引入任何波动方程的情况下，重现了Lepage和Brodsky以及Dziembowski关于自旋一半的前沿形式的结果。 显示英文摘要

摘要： On the one hand any effective action of the QCD, $S[\pi,\,\rho,\,\omega,\ldots,N,\,\overline N,\,\Delta^{3/2},\ldots]$, would involve, at least in principle, a tower of hadronic fields of all spins; on the other hand the front form of the field theory has emerged as an appropriate framework to investigate the high energy behaviour of many systems. Motivated by these simple considerations we present a systematic formalism which explicitly provides the front form fields appropriate for constructing a $S[\pi,\,\rho,\,\omega,\ldots,N,\,\overline N,\,\Delta^{3/2},\ldots]$. Further, a transformation matrix $\Omega(j)$ is constructed which determines how the front form hadronic fields superimpose to yield the more familiar instant form fields. Explicit results for the front form hadronic fields up to spin two are catalogued in appendixes. For spin one half, the $\Omega(1/2)$ coincides with the celebrated ``Melosh transformation.'' The formalism, without explicitly invoking any wave equations, reproduces spin one half front-form results of Lepage and Brodsky, and Dziembowski.