https://scholars.lib.ntu.edu.tw/handle/123456789/574872
標題: | Dalitz analysis of D0 →k-π+η decays at Belle | 作者: | Chen Y.Q. et al. (Belle Collaboration) WEI-SHU HOU |
公開日期: | 2020 | 卷: | 102 | 期: | 1 | 來源出版物: | Physical Review D | 摘要: | 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 K2?(1980)-π+, together with Kπ and Kη S-wave components. The decays K?(1680)-→K-η and K2?(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)-0.04+0.06(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→[K2?(1980)-→K-η]π+)=(2.2-1.9+1.7)×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 Flatt? model. We also measure B(D0→K??(892)0η)=(1.41-0.12+0.13)%. 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)%. ? 2020 authors. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85092410224&doi=10.1103%2fPhysRevD.102.012002&partnerID=40&md5=b7c5ebb4b2ae8420e503bc3f3510cd6d https://scholars.lib.ntu.edu.tw/handle/123456789/574872 |
ISSN: | 24700010 | DOI: | 10.1103/PhysRevD.102.012002 |
顯示於: | 物理學系 |
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