Partial reconstruction of the decay $B_{s}^{0}\rightarrow ϕ(K^{+}K^{-})η' (π^{+}π^{-}η)$

The decay $B_s^0 \to ϕ(K^+K^-)η'(π^+π^-η)$ is of particular interest in flavour physics because in the Standard Model it proceeds predominantly through the quark transition $\bar{b} \to \bar{s}s\bar{s}$. However, the reconstruction of this decay is experimentally challenging due to the presence of t