Measurement of the branching fraction of the doubly Cabibbo-suppressed decay D0→K+π−π0 and search for
M. Ablikim,М. Н. Ачасов,P. Adlarson,M. Albrecht,R. Aliberti,A. Amoroso,M. R. An,Q. An,X. H. Bai,Y. Bai,O. Bakina,R. Baldini Ferroli,I. Balossino,Y. Ban,V. Batozskaya,D. Becker,K. Begzsuren,N. Berger,M. Bertani,D. Bettoni,F. Bianchi,J. Bloms,A. Bortone,I. Boyko,R. A. Briere,A. Brueggemann,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Çetin,J. F. Chang,W. L. Chang,G. A. Chelkov,C. Chen,G. Chen,H. S. Chen,M. L. Chen,S. J. Chen,T. Chen,X. R. Chen,X. T. Chen,Y. B. Chen,Z. J. Chen,W. S. Cheng,G. Cibinetto,F. Cossio,J. J. Cui,H. L. Dai,J. P. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,Y. Ding,J. Dong,L. Y. Dong,M. Y. Dong,X. Dong,S. X. Du,P. Egorov,Y. L. Fan,J. Fang,S. S. Fang,Y. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,J. H. Feng,K. M. Fischer,M. Fritsch,C. D. Fu,He Gao,Yang Gao,Yang Gao,S. Garbolino,I. Garzia,P. Ge,Z. W. Ge,C. Geng,E. Gersabeck,A. Gilman,K. Goetzen,L. Gong,W. X. Gong,W. Gradl,M. Greco,L. M. Gu,M. H. Gu,Y. T. Gu,C. Y. Guan,A. Q. Guo,L. B. Guo,R. P. Guo,Y. P. Guo,A. Guskov,Tao Han,W. Y. Han,X. Q. Hao,F. A. Harris,K. K. He,K. L. He,F. H. Heinsius,C. Heinz,Y. K. Heng,C. Herold,M. Himmelreich,T. Holtmann,G. Y. Hou,Y. R. Hou,Z. L. Hou,H. M. Hu,J. F. Hu,T. Hu,Y. Hu,G. S. Huang,K. X. Huang,L. Q. Huang,L. Q. Huang,X. T. Huang,Y. Huang,Z. Huang,T. Hussain,N. Hüsken,W. Imoehl,M. Irshad,J. Jackson,S. Jaeger,S. Janchiv,Q. Ji,Q. P. Ji,X. B. Ji,X. L. Ji,Y. Y. Ji,Z. K. Jia,H. B. Jiang,S. S. Jiang,X. S. Jiang,Y. Jiang,J. B. Jiao,Z. Jiao,S. Jin,Y. Jin,M. Q. Jing,T. Johansson,N. Kalantar‐Nayestanaki,X. S. Kang,R. Kappert,B. C. Ke,I. K. Keshk,A. Khoukaz,P. Kiese,R. Kiuchi,R. Kliemt,L. Koch,O. B. Kolcu,B. Kopf,M. Kuemmel,M. Kuessner,A. Kupść,W. Kühn,J. J. Lane,J. S. Lange,P. Larin,A. Lavania,L. Lavezzi,Z. H. Lei,H. Leithoff,M. Lellmann,T. Lenz,C. Li,C. Li,C. H. Li,Cheng Li,D. M. Li,F. Li,G. Li,H. Li,H. Li,H. B. Li,H. J. Li,H. N. Li,J. Q. Li,J. S. Li,J. W. Li,Ké Li,L. J. Li,L. K. Li,Lei Li,M. 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Physical review（2022）
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摘要
Using 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+π−π0 and a search for the DCS decay D0→K+π−π0π0. The branching fraction of D0→K+π−π0 is determined to be [3.13−0.56+0.60(stat)±0.15(syst)]×10−4. No signal is observed for D0→K+π−π0π0, 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+π−π0)/B(D0→K−π+π0)=(0.22±0.04)% and B(D0→K+π−π0π0)/B(D0→K−π+π0π0)<0.40% at the 90% CL which correspond to (0.75±0.14)tan4θC and 1.37×tan4θC, respectively, where θC is the Cabibbo mixing angle.Received 3 March 2022Accepted 18 May 2022DOI:https://doi.org/10.1103/PhysRevD.105.112001Published by the American Physical Society under the terms of the 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.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasParticle decaysPhysical SystemsCharmed mesonsParticles & Fields
