Scaling in the short-time approximation

TL;DR

This paper reviews the concept of scaling in quasielastic scattering, demonstrating that two-nucleon currents enhance rather than spoil scaling, emphasizing the role of pion exchange interactions in the short-time approximation.

Contribution

It introduces a short-time approximation approach showing that two-nucleon currents enhance scaling, highlighting the importance of pion exchange in quasielastic scattering.

Findings

Two-nucleon currents enhance the transverse electromagnetic response.

Scaling is preserved and even enhanced by two-nucleon currents.

Pion exchange interactions are key in the quasielastic regime.

Abstract

We briefly review the concept of scaling and how it occurs in quasielastic electron and neutrino scattering from nuclei, and then the particular approach to scaling in the short-time approximation. We show that, while two-nucleon currents do significantly enhance the transverse electromagnetic response, they do not spoil scaling, but in fact enhance it. We provide scaling results obtained in the short-time approximation that verify this claim. The enhanced scaling is not ``accidental'' -- as claimed in Ref.~\cite{Benhar:2020jye} -- but rather reflects the dominant role played by pion exchange interactions and currents in the quasielastic regime.