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arXiv 1706.08201hep-ph
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用超几何求费曼积分

Evaluating Feynman integrals by the hypergeometry

Tai-Fu Feng, Chao-Hsi Chang, Jian-Bin Chen, Zhi-Hua Gu, Hai-Bin Zhang

摘要:

超几何函数法自然地给出了在独立运动变量的某些连通区域上由Feynman图得到的标量积分的解析表达式,以及相应的标量积分所满足的齐次线性偏微分方程组。以单圈$B_{_0}$和无质量$C_{_0}$函数,以及双圈真空图和日落图的标量积分为例,验证了我们的表达式与文献中的著名结果是一致的.基于独立运动变量的多重超几何函数,建立了上述标量积分所满足的齐次线性偏微分方程组。变分法将线性偏微分方程组看作是泛函在一定约束条件下的驻值条件,这是用有限元法将标量积分数值延拓到整个运动域的基础。原则上,这种方法可以用来计算任何费曼图的标量积分。

英文摘要:

The hypergeometric function method naturally provides the analytic expressions of scalar integrals from concerned Feynman diagrams in some connected regions of independent kinematic variables, also presents the systems of homogeneous linear partial differential equations satisfied by the corresponding scalar integrals. Taking examples of the one-loop $B_{_0}$ and massless $C_{_0}$ functions, as well as the scalar integrals of two-loop vacuum and sunset diagrams, we verify our expressions coinciding with the well-known results of literatures. Based on the multiple hypergeometric functions of independent kinematic variables, the systems of homogeneous linear partial differential equations satisfied by the mentioned scalar integrals are established. Using the calculus of variations, one recognizes the system of linear partial differential equations as stationary conditions of a functional under some given restrictions, which is the cornerstone to perform the continuation of the scalar integrals to whole kinematic domains numerically with the finite element methods. In principle this method can be used to evaluate the scalar integrals of any Feynman diagrams.

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