TL;DR
This review discusses the experimental and theoretical status of hadronic parity nonconservation, highlighting recent re-analyses and lattice QCD results that suggest a more consistent pattern of PNC couplings and outline future research directions.
Contribution
It provides a comprehensive re-analysis of PNC asymmetry data, integrating lattice QCD calculations to refine the understanding of hadronic PNC couplings and their theoretical models.
Findings
Isoscalar coupling strengths are slightly larger than previous estimates.
Lattice QCD and experiments indicate a suppressed parity-nonconserving pion-nucleon coupling.
A more consistent pattern of PNC couplings emerges from the re-analysis.
Abstract
The history and phenomenology of hadronic parity nonconservation (PNC) is reviewed. We discuss the current status of the experimental tests and theory. We describe a re-analysis of the asymmetry for polarized proton-proton scattering that, when combined with other experimental constraints and with a recent lattice QCD calculation of the weak pion-nucleon coupling, reveals a much more consistent pattern of PNC couplings. In particular, isoscalar coupling strengths are similar to but somewhat larger than the "best value" estimate of Donoghue, Desplanques, and Holstein, while both lattice QCD and experiment indicate a suppressed parity-nonconserving pion-nucleon coupling. We discuss the relationship between meson-exchange models of hadronic PNC and formulations based on effective theory, stressing their general compatibility as well as the challenge presented to theory by experiment, as…
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