Speaker
Description
In this talk, I present an amplitude analysis of $B^+ \to D^- K^+ \pi^+$ decays using the full data samples collected by the LHCb experiment at the Large Hadron Collider in Run I and II. The structure in the Dalitz plot of the decay allows us to study excited neutral charm meson states in the $m(D^-\pi^+)$ system, measuring masses, widths and quantum numbers. The study of excited charm states is well motivated by a strong theory community, with their expected spectrum being well predicted.
Furthermore, I will outline a search for two exotic states, the $T^*_{cs}$ tetraquarks, contributing to the $B^+ \rightarrow D^- K^+ \pi^+$ decays in the $m(D^- K^+)$ system. In recent years several exotic states have been discovered, but in most cases their exact nature is unknown. The exotic hadron candidates have been seen in $m(D^- K^+)$ mass distributions in final states containing two charm mesons. Studying their production (or absence) in $B^+ \to D^- K^+ \pi^+$ decays can help to shed light on their nature.
