Finite-volume formalism in the $2\stackrel{H_I+H_I}{\to }2$ transition: an application to the lattice QCD calculation of double beta decays

Xu Feng, Lu-Chang Jin, Zi-Yu Wang +1

We present the formalism for connecting a second-order electroweak $2\stackrel{H_I+H_I}{\to }2$ transition amplitudes in the finite volume (with two hadrons in the initial and final…