Parity nonconserving two-pion exchange in elastic proton-proton scattering

TL;DR

This paper investigates parity nonconserving two-pion exchange effects in elastic proton-proton scattering, incorporating phenomenological distortions and calculating the resulting analyzing power, revealing effects comparable to vector meson exchanges.

Contribution

It introduces a model for parity nonconserving two-pion exchange in elastic pp scattering including NN and N Delta intermediate states, with calculations of analyzing power.

Findings

Parity nonconserving two-pion exchange effects are comparable to vector meson exchanges.

The model includes NN and N Delta intermediate states.

Calculated analyzing power shows measurable parity violation effects.

Abstract

Parity nonconserving two-pion exchange in elastic pp scattering is investigated in the presence of phenomenological strong distortions in various models. Parity violation is included in the nucleon-pion vertex considering NN and N Delta(1232) intermediate states in box and crossed box diagrams. Using the derived parity nonconserving two-pion exchange potential we calculate the longitudinal analyzing power A_L in elastic $pp$ scattering. The predicted effect is of the same order as vector meson exchanges.