Ablikim, M.Achasov, M.N.Adlarson, P.Çetin, Serkant AliKolcu, Onur Buğra2022-07-072022-07-072022Ablikim, M., Achasov, M. N., Adlarson, P., Albrecht, M., Aliberti, R., Amoroso, A., . . . (BESIII Collaboration). (2022). Measurement of the branching fraction of the doubly cabibbo-suppressed decay D0 →k+π-π0 and search for D0 →k+π-π0π0. Physical Review D, 105(11) doi:10.1103/PhysRevD.105.1120012470-0010https://doi.org/10.1103/PhysRevD.105.112001https://hdl.handle.net/20.500.12713/2991Using 2.93 fb-1 of e+e- collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we present a measurement of the branching fraction of the doubly Cabibbo-suppressed (DCS) decay D0?K+?-?0 and a search for the DCS decay D0?K+?-?0?0. The branching fraction of D0?K+?-?0 is determined to be [3.13-0.56+0.60(stat)±0.15(syst)]×10-4. No signal is observed for D0?K+?-?0?0, and an upper limit of 3.6×10-4 is set on the branching fraction at the 90% CL. We combine these results with the world-average branching fractions of their counterpart Cabibbo-favored decays to determine the ratios of the DCS over the Cabibbo-favored branching fractions, B(D0?K+?-?0)/B(D0?K-?+?0)=(0.22±0.04)% and B(D0?K+?-?0?0)/B(D0?K-?+?0?0)<0.40% at the 90% CL which correspond to (0.75±0.14)tan4?C and 1.37×tan4?C, respectively, where ?C is the Cabibbo mixing angle. © 2022 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 SCOAP3.eninfo:eu-repo/semantics/closedAccessArticle10511WOS:0008133436000012-s2.0-85132337703Q110.1103/PhysRevD.105.112001Q1