CONTRIBUTIONS OF PION AND NUCLEON CURRENTS TO RADIATIVE MU-MESON CAPTURE BY A PROTON
Technical Report
·
OSTI ID:4804599
The matrix element and observables for radiative mumeson capture by a proton were calculated for possible use as a model for capture on a J= 0 nucleus. The problem was treated in second-order perturbation theory. The effects of the nucleon and pion electromagnetic currents were included by taking into account the proton charge and neutron anomalous moments. The effects of the strong interactions on the weak vertices were also considered. Of the possible effective'' vertex operators V, A, P, and M, only P has a strong enough momentum transfer dependence to cause it to significantly differ from a constant in the reaction. This effect, however, is the principle one of several which enhance the role of Cp in radiative capture relative to its role in ordinary capture. The result was a sharp increase in the rate for capture on an unpolarized proton relative to a simple V-A theory, and a noticeable reduction of parity-violating effects. First-order terms derived from the application of gage invariance were added to the second order perturbation terms. These turned out not to have a large effect. Higher'' pionic effects, outside the perturbation theory, are also shown to have slight effects, once procedures for dealing with divergence difficulties are established. (auth)
- Research Organization:
- Carnegie Inst. of Tech., Pittsburgh
- NSA Number:
- NSA-16-012437
- OSTI ID:
- 4804599
- Report Number(s):
- NYO-9284
- Country of Publication:
- United States
- Language:
- English
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