Looking for meson molecules in B decays

Original · EN

We discuss the possibility of observing a loosely bound molecular state in a B three-body hadronic decay. In particular we use the QCD sum rule approach to study a η′-π molecular current. We consider an isovector-scalar Iᵍ JPC= 1- 0⁺⁺ molecular current and we use the two-point and three-point functions to study the mass and decay width of such state. We consider the contributions of condensates up to dimension six and we work at leading order in αₛ. We obtain a mass around 1.1 GeV, consistent with a loosely bound state, and a η′-π→ K+ K- decay width around 10 MeV.