Abstract
The interactions between nucleons contain a parity-violating component, which originates in the weak interaction between quarks and which is suppressed by a factor of approximately 10−7 compared to the dominant parity-conserving component. A theoretical framework based on effective field theory methods to analyze and interpret parity-violating interactions between nucleons is described and a number of applications are discussed.
Highlights
Interactions between nucleons are dominated by strong and electromagnetic effects, which conserve parity
There is a parity-violating (PV) component to nucleon-nucleon interactions, which is expected to be suppressed by a factor of roughly 10−7 to 10−6 compared to the parity-conserving (PC) component
The PV part of the nucleon interactions stems from an interplay of weak interactions between quarks and the strong interactions that confine the quarks into nucleons
Summary
Interactions between nucleons are dominated by strong and electromagnetic effects, which conserve parity. There is a parity-violating (PV) component to nucleon-nucleon interactions, which is expected to be suppressed by a factor of roughly 10−7 to 10−6 compared to the parity-conserving (PC) component. Parity-violating effects can be isolated in pseudoscalar observables, which would vanish if parity was conserved. Such observables include longitudinal and angular asymmetries, as well as induced polarizations in capture, break-up, and transmission experiments. While PV effects can be enhanced by several orders of magnitude in heavier systems I describe an approach to hadronic parity violation based on effective field theory (EFT) and present selected results from two- and three-nucleon systems
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