Novel method for searching for the 80=+ c-800=+ c mixing effect in the angular distribution analysis of a four-body 80=+ c decay

In this work, we raise a novel method for searching for the E0 thorn c -E0 thorn 0 c mixing effect in an angular distribution analysis of the Ec -> Eo0 thorn oA pi thorn l thorn nu decay, where the mixing effect can be observed by the appearance of the E0 resonance. Armed with this angular distribution, the branching fraction and the forward-backward asymmetry are predicted. We point out that the forward-backward asymmetry, as a function of the invariant mass square of Eo0 thorn and the E0 thorn c -E0 thorn 0 c mixing angle theta c, can be used to distinguish the two resonances Eo0 thorn and even provide a possibility to determine the exact mixing angle.

Automated summary

In this work, a novel method is proposed to search for the E0 thorn c - E0 thorn 0 c mixing effect in the angular distribution analysis of the Ec -> Eo0 thorn oA pi thorn l thorn nu decay. The appearance of the E0 resonance indicates the presence of the mixing effect, which can be observed using this angular distribution. The forward-backward asymmetry, as a function of the invariant mass square of Eo0 thorn and the E0 thorn c - E0 thorn 0 c mixing angle theta c, can be utilized to distinguish the two resonances and determine the exact mixing angle.