A comment on "weak phase $γ$ using isospin analysis and time-dependent asymmetry in $B^0\to K_Sπ^+π^-"

Abstract

We comment on a recent suggestion for measuring $γ$ in $B^0(t)\to K_Sπ^+π^-$. A difficulty is pointed out in relating electroweak penguin and tree amplitudes in $B^+\to K^0π^+π^0$, which is crucial for an implementation of this method. We clarify the necessary condition for such a relation.