Charge Symmetry Violation in $pn\to d π^0$ as a Test of Chiral Effective Field Theory

Physics – Nuclear Physics – Nuclear Theory

Scientific paper

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9 pages, 1 figure, to be submitted to Phys.Lett. B

Scientific paper

10.1016/S0370-2693(00)01133-3

Chiral effective field theory predicts a specific charge symmetry violating amplitude for pion production. This term is shown to provide the dominant contribution to the forward-backward asymmetry in the angular distribution for the reaction $pn\to d\pi^0$, for reasonable values of the mass difference between down and up quarks, $\delta m_N$. Using a value $\delta m_N\approx$ 3 MeV leads to a prediction of a 10 standard deviation effect for a TRIUMF experiment.

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