Using an amplitude analysis to measure the photon polarisation in $B\to K\pi \pi \gamma$ decays

Violaine Bellée, Preema Pais, Albert Puig Navarro +4

A method is proposed to measure the photon polarisation parameter ${\lambda }_{\gamma }$ in $b\to s\gamma$ transitions using an amplitude analysis of $B\to K\pi \pi \gamma$ decays. Simplified models of the $K\pi \pi$ i…