Amplitude analysis of $B^+ \to \psi(2S) K^+ \pi^+ \pi^-$ decays
Amplitude analysis of $B^+ \to \psi(2S) K^+ \pi^+ \pi^-$ decays
The first full amplitude analysis of $B^+ \to \psi(2S) K^+ \pi^+ \pi^-$ decays is performed using proton-proton collision data corresponding to an integrated luminosity of $9\,\text{fb}^{-1}$ recorded with the LHCb detector. The rich $K^+ \pi^+ \pi^-$ spectrum is studied and the branching fractions of the resonant substructure associated with the …