Faculty and Student Publications

Authors

Y. Q. Chen, University of Science and Technology of China
L. K. Li, University of Cincinnati
W. B. Yan, University of Science and Technology of China
I. Adachi, The Graduate University for Advanced Studies
H. Aihara, The University of Tokyo
S. Al Said, King Abdulaziz University
D. M. Asner, Brookhaven National Laboratory
H. Atmacan, University of Cincinnati
V. Aulchenko, Budker Institute of Nuclear Physics of the Siberian Branch of the RAS
T. Aushev, Moscow Institute of Physics and Technology
R. Ayad, University of Tabuk
V. Babu, Deutsches Elektronen-Synchrotron (DESY)
I. Badhrees, King Abdulaziz City for Science and Technology
S. Bahinipati, Indian Institute of Technology Bhubaneswar
P. Behera, Indian Institute of Technology Madras
J. Bennett, University of Mississippi
V. Bhardwaj, Indian Institute of Science Education and Research Mohali
T. Bilka, Charles University
J. Biswal, Jozef Stefan Institute
A. Bozek, Henryk Niewodniczanski Institute of Nuclear Physics of the Polish Academy of Sciences
M. Bračko, Jozef Stefan Institute
T. E. Browder, University of Hawaiʻi at Mānoa
M. Campajola, Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
L. Cao, Universität Bonn
D. Červenkov, Charles University
M. C. Chang, Fu Jen Catholic University
V. Chekelian, Max Planck Institute for Physics (Werner Heisenberg Institute)
A. Chen, National Central University Taiwan
B. G. Cheon, Hanyang University
K. Chilikin, P.N. Lebedev Physical Institute of the Russian Academy of Sciences
H. E. Cho, Hanyang University
K. Cho, Korea Institute of Science and Technology Information

Document Type

Article

Publication Date

7-1-2020

Abstract

© 2020 authors. 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 K̄∗(892)0η, K-a0(980)+, K-a2(1320)+, K̄∗(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 Flatté model. We also measure B(D0→K̄∗(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)%.

Relational Format

journal article

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