Exclusive reconstruction of \(B\)-decays with missing neutrals (Q1949876)

Summary: Often decay channels that are of theoretical interest cannot be reconstructed exclusively due to missing neutrals (such as neutrinos), or due to single-track vertices. This situation appears both in underground astrophysics experiments as well as in conventional accelerator experiments. A method to ``recover'' such missing particles from their kinematics and reconstruct ``exclusively'' the modes would benefit both domains in a number of ways. The main idea is to combine 4-momentum conservations in vertices with available geometric information in the event. The paper gives details of such methods on the \(B_s^0\rightarrow D_s^-K^+\), \(D_s^-\rightarrow K^+K^-\pi^-(\pi^0)\) prototype decay, which also encounters 2-fold ambiguities in its solutions. Such ambiguities can be lifted and the paper shows how, while also addressing the potential the method has in physics analyses and detector studies.