Dispersive construction of two-loop $P\to \pi \pi \pi$ $(P=K,\eta )$ amplitudes

Karol Kampf, Marc Knecht, Jiri Novotny +1

We present and develop a general dispersive framework allowing us to construct representations of the amplitudes for the processes $P\pi \to \pi \pi$, $P=K,\eta$, valid at the two-loop level i…