Update on the Sea Contributions to Hadron Electric Polarizabilities through Reweighting

Understand

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.