OPITeR: A program for tensor reduction of multi-loop Feynman integrals

We present OPITeR, a Form program for the reduction of multi-loop tensor Feynman integrals. The program can handle tensors, including spinor indices, with rank of up to 20 and can deal with up to 8 independent external momenta. The reduction occurs in D dimensions compatible with conventional dimensional regularization. The program is able to manifest symmetries of the integrand in the tensor reduced form.我们提出OPITeR——一款用于多圈张量费曼积分约化的FORM程序。该程序可处理最高达20阶、包含旋量指标的张量，同时可处理至多8个独立外动量。约化过程在适配常规维数正规化的D维空间中进行。本程序能够显式展现张量约化形式下被积函数的对称性。