标题： 局域性和解析性的交叉对称色散关系 显示英文标题

标题： Locality and Analyticity of the Crossing Symmetric Dispersion Relation

摘要： 本文讨论了交叉对称色散关系（CSDR）的局部性和解析性。 在CSDR上施加局部性约束会产生一个局部且完全交叉对称的散射振幅展开，称为费曼块展开。 提供了从展开中出现的接触项的一般公式。 该展开的解析性区域也类似于Lehmann-Martin椭圆推导得出。 我们对II型超弦树幅的观察表明，费曼块展开具有更大的解析性区域和更好的收敛性。 显示英文摘要

摘要： This paper discusses the locality and analyticity of the crossing symmetric dispersion relation (CSDR). Imposing locality constraints on the CSDR gives rise to a local and fully crossing symmetric expansion of scattering amplitudes, dubbed as Feynman block expansion. A general formula is provided for the contact terms that emerge from the expansion. The analyticity domain of the expansion is also derived analogously to the Lehmann-Martin ellipse. Our observation of type-II super-string tree amplitude suggests that the Feynman block expansion has a bigger analyticity domain and better convergence.