Negative dimensional integration method (NDIM) is a technique which can be applied, with success, in usual covariant gauge calculations. We consider three two-loop diagrams: the scalar massless non-planar double-box with six propagators and the scalar pentabox in two cases, where six virtual particles have the same mass and in the case where all of them are massless. Our results are given in terms hypergeometric functions of Mandelstam variables and for arbitrary exponents of propagators and dimension $D$ as well.
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机译：负维积分方法（NDIM）是一种可以成功应用于通常的协变量规计算的技术。我们考虑三个两环图：在两种情况下，六个虚拟粒子的质量相同，而在所有情况下都是无质量的情况下，带有六个传播子的标量无质量非平面双箱和标量五角箱。我们的结果以Mandelstam变量的超几何函数以及传播子的任意指数和维$ D $的形式给出。
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