Parity-violating polarization in $np \to dγ$ with a pionless effective field theory

Details Parity-violating polarization in $np \to dγ$ with a pionless effective field theory Parity-violating polarization in $np \to dγ$ with a pionless effective field theory

2009-07-23

arxiv.org/abs/0907.3995v1

Phys.Rev.C81:055501,2010

Physics

Nuclear Physics

Nuclear Theory

12 pages, 1 figure

Scientific paper

10.1103/PhysRevC.81.055501

We consider the two-nucleon weak interaction with a pionless effective field theory. Dibaryon fields are introduced to facilitate calculations and ensure precision in the initial and final state propagators. Weak interactions are accounted for with the parity-violating dibaryon-nucleon-nucleon vertices, which contain unknown weak dibaryon-nucleon-nucleon coupling constants. We apply the model to the calculation of a parity-violating observable in the neutron-proton capture at threshold. Result is obtained up to the linear order in the unknown dibaryon-nucleon-nucleon coupling constants. We compare our result to the one obtained from a hybrid calculation, and discuss the extension to weak interactions in the few-body systems.

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