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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/221422
Low-mass enhancement of kaon pairs in B + → D<em> (*)</em> 0 K + K 0 and B 0 → D<em> (*) -</em> 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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WANG, Wen-Fei, et al. Low-mass enhancement of kaon pairs in B + → D (*) 0 K + K 0 and B 0 → D (*) - K + K 0 decays. Physical Review D. 2024. Vol. 109, num. 11. ISSN 2470-0010. [consulted: 23 of August of 2026]. Available at: https://hdl.handle.net/2445/221422