Very recently, the Belle II collaboration presented a measurement for the decays B⁺→D̄(*)0K⁺K̄⁰ and B⁰→D^(*)-K⁺K̄⁰, with the bulk of observed m(K⁺KS⁰) distributions showing low-mass structures in all four channels. In this work, we study the contributions of ρ(770,1450)⁺, a₂(1320)⁺, and a₀(980,1450)⁺ resonances to these decay processes. The intermediate states ρ(770,1450)⁺ are found to dominate the low-mass distribution of kaon pairs roughly contributing to half of the total branching fraction in each of the four decay channels. The contribution of the tensor a₂(1320)⁺ meson is found to be negligible. Near the threshold of the kaon pair, the state a₀(980)⁺ turns out to be much less important than expected, not being able to account for the enhancement of events in that energy region observed in the B⁺→D̄(*)0K⁺K̄⁰ decays. Further studies both from the theoretical and experimental sides are needed to elucidate the role of the nonresonant contributions governing the formation of K⁺K̄⁰ pairs near their threshold in these decay processes.
No takes yet. Share an insight, caveat, or question.
Wang et al. (2024) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: