Dalitz analysis of D-0 -> K- pi(+)eta decays at Belle
AuthorChen, YQ; Li, LK; Yan, WB; Adachi, I; Aihara, H; Al Said, S; Asner, DM; Atmacan, H; Aulchenko, V; Aushev, T; ...
Source TitlePhysical Review D: Particles, Fields, Gravitation and Cosmology
PublisherAMER PHYSICAL SOC
University of Melbourne Author/sUrquijo, Phillip; Sevior, Martin; Ferlewicz, Daniel; MacQueen, Caitlin
AffiliationSchool of Physics
Document TypeJournal Article
CitationsChen, Y. Q., Li, L. K., Yan, W. B., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bahinipati, S., Behera, P., Bennett, J., Bhardwaj, V., Bilka, T., Biswal, J. ,... Zhulanov, V. (2020). Dalitz analysis of D-0 -> K- pi(+)eta decays at Belle. PHYSICAL REVIEW D, 102 (1), https://doi.org/10.1103/PhysRevD.102.012002.
Access StatusOpen Access
We present the results of the first Dalitz plot analysis of the decay D0 → K−πþη. The analysis is performed on a data set corresponding to an integrated luminosity of 953 fb−1 collected by the Belle detector at the asymmetric-energy eþe− KEKB collider. The Dalitz plot is well described by a combination of the six resonant decay channels K¯ ð892Þ0η, K−a0ð980Þþ, K−a2ð1320Þþ, K¯ ð1410Þ0η, Kð1680Þ−πþ and K 2ð1980Þ−πþ, together with Kπ and Kη S-wave components. The decays Kð1680Þ− → K−η and K 2ð1980Þ− → K−η are observed for the first time. We measure ratio of the branching fractions, BðD0→K−πþηÞ BðD0→K−πþÞ ¼ 0.500 0.002ðstatÞ 0.020ðsystÞ 0.003ðBPDGÞ. Using the Dalitz fit result, the ratio BðKð1680Þ→KηÞ BðKð1680Þ→KπÞ is measured to be 0.11 0.02ðstatÞ þ0.06 −0.04 ðsystÞ 0.04ðBPDGÞ; this is much lower than the theoretical expectations (≈1) made under the assumption that Kð1680Þ is a pure 13D1 state. The product branching fraction BðD0 → ½K 2ð1980Þ− → K−η πþÞ¼ð2.2þ1.7 −1.9 Þ × 10−4 is determined. In addition, the πη0 contribution to the a0ð980Þ resonance shape is confirmed with 10.1σ statistical significance using the three-channel Flatt´e model. We also measure BðD0 → K¯ ð892Þ0ηÞ¼ð1.41þ0.13 −0.12 Þ%. This is consistent with, and more precise than, the current world average ð1.02 0.30Þ%, deviates with a significance of more than 3σ from the theoretical predictions of (0.51–0.92)%.
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