Baryonic and mesonic 3-point functions with open spin indices

TL;DR

The paper introduces a novel method for computing three-point correlation functions in particle physics, enabling efficient simultaneous estimation of multiple states with minimal computational cost.

Contribution

It presents a new factorization technique for three-point functions and an optimized library implementation for modern parallel hardware.

Findings

Efficient computation of multiple three-point functions

Reduced computational overhead for various states and momenta

Implementation on modern CPU architectures including Xeon Phi

Abstract

We have implemented a new way of computing three-point correlation functions. It is based on a factorization of the entire correlation function into two parts which are evaluated with open spin- (and to some extent flavor-) indices. This allows us to estimate the two contributions simultaneously for many different initial and final states and momenta, with little computational overhead. We explain this factorization as well as its efficient implementation in a new library which has been written to provide the necessary functionality on modern parallel architectures and on CPUs, including Intel's Xeon Phi series.