Dalitz analysis of D-0 -> K- pi(+)eta decays at Belle
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Authors
Editor
Date
2020-07-06
Source Title
Physical Review D: Particles, Fields, Gravitation and Cosmology
Publisher
AMER PHYSICAL SOC
Melbourne Authors
Affiliation
School of Physics
Document Type
Journal Article
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Citations
Chen, 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.
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Open Access
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Open Access at PMC
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Description
Abstract
We present the results of the first Dalitz plot analysis of the decay D0→K−π+η. 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 e+e− KEKB collider. The Dalitz plot is well described by a combination of the six resonant decay channels ¯K∗(892)0η, K−a0(980)+, K−a2(1320)+, ¯K∗(1410)0η, K∗(1680)−π+ and K∗2(1980)−π+, together with Kπ and Kη S-wave components. The decays K∗(1680)−→K−η and K∗2(1980)−→K−η are observed for the first time. We measure ratio of the branching fractions, B(D0→K−π+η)B(D0→K−π+)=0.500±0.002(stat)±0.020(syst)±0.003(BPDG). Using the Dalitz fit result, the ratio B(K∗(1680)→Kη)B(K∗(1680)→Kπ) is measured to be 0.11±0.02(stat)+0.06−0.04(syst)±0.04(BPDG); this is much lower than the theoretical expectations (≈1) made under the assumption that K∗(1680) is a pure 13D1 state. The product branching fraction B(D0→[K∗2(1980)−→K−η]π+)=(2.2+1.7−1.9)×10−4 is determined. In addition, the πη′ contribution to the a0(980)± resonance shape is confirmed with 10.1σ statistical significance using the three-channel Flatté model. We also measure B(D0→¯K∗(892)0η)=(1.41+0.13−0.12)%. This is consistent with, and more precise than, the current world average (1.02±0.30)%, deviates with a significance of more than 3σ from the theoretical predictions of (0.51–0.92)%.