Update on the Sea Contributions to Hadron Electric Polarizabilities through Reweighting

TL;DR

This paper introduces a reweighting method with noise reduction techniques to estimate the sea quark contribution to neutron electric polarizability, highlighting the challenges and statistical limitations involved.

Contribution

It presents a novel hopping parameter expansion-based approach to reduce stochastic noise in reweighting calculations for hadron polarizabilities.

Findings

Reweighting increases statistical error due to stochastic noise.

Technique applied to 300 configurations of nHYP-clover fermions.

Challenges in accurately estimating sea quark contributions identified.

Abstract

We present the results of a reweighting calculation to compute the contribution of the charged quark sea to the neutron electric polarizability. The chief difficulty is the stochastic estimation of weight factors, and we present a hopping parameter expansion-based technique for reducing the stochastic noise, along with a discussion of why this particular reweighting is so difficult. We used this technique to estimate weight factors for 300 configurations of nHYP-clover fermions and compute the neutron polarizability, but the reweighting greatly inflates the overall statistical error, driven by the stochastic noise in the weight factors.