Triangle (Causal) Distributions in the Causal Approach

TL;DR

This paper introduces a causal formalism approach to reduce tensor Feynman amplitudes to scalar integrals, offering an alternative to the traditional Passarino-Veltman method.

Contribution

It presents a novel causal formalism method for tensor amplitude reduction, differing from the standard Passarino-Veltman procedure.

Findings

Demonstrates the effectiveness of the causal approach

Provides explicit reduction formulas

Offers potential advantages in computational efficiency

Abstract

The tensor Feynman amplitudes are reduced to scalar integrals by a procedure of Passarino and Veltman. We provide an alternative approach based on the causal formalism.