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arXiv 1406.6574hep-thhep-ph
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约束次引导软胶子和引力子定理

Constraining subleading soft gluon and graviton theorems

Johannes Broedel, Marius de Leeuw, Jan Plefka, Matteo Rosso

摘要:

我们证明了最近提出的次级软引力子和胶子定理的形式在任何维度上都受到基于Poincaré和规范不变性的基本参数以及由散射振幅的分布性质引起的自洽条件的严格约束。结合局部形式的假设,因为它将产生于一个沃德恒等式的次领先运营商的轨道部分是完全固定的领先普遍温伯格软极点行为。在软动量展开的每一个顺序中,每个硬腿的微分subleading软算子的极化部分依次被确定为单个数值因子。在四维中,洛伦兹群的因式分解允许完全固定子导算子。

英文摘要:

We show that the form of the recently proposed subleading soft graviton and gluon theorems in any dimension are severely constrained by elementary arguments based on Poincaré and gauge invariance as well as a self-consistency condition arising from the distributional nature of scattering amplitudes. Combined with the assumption of a local form as it would arise from a Ward identity the orbital part of the subleading operators is completely fixed by the leading universal Weinberg soft pole behavior. The polarization part of the differential subleading soft operators in turn is determined up to a single numerical factor for each hard leg at every order in the soft momentum expansion. In four dimensions, factorization of the Lorentz group allows to fix the subleading operators completely.

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