Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1856617 | Progress in Particle and Nuclear Physics | 2013 | 19 Pages |
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 reanalysis of the asymmetry for pâ+p that, when combined with other experimental constraints and with a recent lattice QCD calculation of the weak pion-nucleon coupling hÏ1, 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 hÏ1. 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 several of the most precise measurements involve significant momentum scales. Future directions are proposed.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Wick C. Haxton, Barry R. Holstein,