Towards Multi-hadron matrix elements from Lattice QCD

Accessing low-energy nuclear physics from Quantum ChromoDynamics (QCD) poses several challenges given its non-perturbative nature and the fact that most processes involve few-body dynamics. A synergistic approach between lattice QCD and scattering theory offers a systematic pathway towards numerically computing few-body nuclear observables from first principles. In this talk I will present an overview of this program, focusing on the recent theoretical developments aimed at extracting two-hadron electroweak matrix elements from lattice QCD simulations. These new frameworks allow for a first principles determination of reactions such as the photodisintegration of the deuteron and two-photon fusion to two-pions.