# name
Low-mass enhancement of kaon pairs in B + → D (*) 0 K + K 0 and B 0 → D (*) - K + K 0 decays

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Very recently, the Belle II collaboration presented a measurement for the decays   + →¯  (*)⁢0⁢  +⁢¯   0 and   0 →  (*)−⁢  +⁢¯  0, with the bulk of observed   ⁡(  +⁢  0  ) distributions showing low-mass structures in all four channels. In this work, we study the contributions of   ⁢(770,1450)+,   2⁢(1320)+, and   0⁢(980,1450)+ resonances to these decay processes. The intermediate states   ⁢(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   2⁢(1320)+ meson is found to be negligible. Near the threshold of the kaon pair, the state   0⁢(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   + →¯  (*)⁢0⁢  +⁢¯  0 decays. Further studies both from the theoretical and experimental sides are needed to elucidate the role of the nonresonant contributions governing the formation of   +⁢¯   0 pairs near their threshold in these decay processes.

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Physical Review D, 2024, vol. 109, num.11

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Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Low-mass enhancement of kaon pairs in B + → D (*) 0 K + K 0 and B 0 → D (*) - K + K 0 decays