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Study of the decay D0 → K 0π-e+νe STUDY of the DECAY ... M. ABLIKIM et al.

Ablikim M., Achasov M. N., Ahmed S., Albrecht M., Alekseev M., Amoroso A., An F. F., An Q., Bai Y., Bakina O., Ferroli R. Baldini, Ban Y., Begzsuren K., Bennett D. W., Bennett J. V., Berger N., Bertani M., Bettoni D., Bianchi F., Boger E., Boyko I., Briere R. A., Cai H., Cai X., Calcaterra A., Cao G. F., Cetin S. A., Chai J., Chang J. F., Chang W. L., Chelkov G., Chen G., Chen H. S., Chen J. C., Chen M. L., Chen P. L., Chen S. J., Chen X. R., Chen Y. B., Cheng W., Chu X. K., Cibinetto G., Cossio F., Dai H. L., Dai J. P., Dbeyssi A., Dedovich D., Deng Z. Y., Denig A., Denysenko I., Destefanis M., De Mori F., Ding Y., Dong C., Dong J., Dong L. Y., Dong M. Y., Dou Z. L., Du S. X., Duan P. F., Fang J., Fang S. S., Fang Y., Farinelli R., Fava L., Feldbauer F., Felici G., Feng C. Q., Fritsch M., Fu C. D., Gao Q., Gao X. L.

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the »https://creativecommons.org/licenses/by/4.0/» Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . We report a study of the decay D0→K̄0π-e+νe based on a sample of 2.93 fb-1 e+e- annihilation data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector at the BEPCII collider. The total branching fraction is determined to be B(D0→K̄0π-e+νe)=(1.434±0.029(stat.)±0.032(syst.))%, which is the most precise to date. According to a detailed analysis of the involved dynamics, we find this decay is dominated with the K∗(892)- contribution and present an improved measurement of its branching fraction to be B(D0→K∗(892)-e+νe)=(2.033±0.046(stat.)±0.047(syst.))%. We further access their hadronic form-factor ratios for the first time as rV=V(0)/A1(0)=1.46±0.07(stat.)±0.02(syst.) and r2=A2(0)/A1(0)=0.67±0.06(stat.)±0.01(syst.). In addition, we observe a significant K̄0π- S-wave component accounting for (5.51±0.97(stat.)±0.62(syst.))% of the total decay rate.