Observation of the doubly Cabibbo-suppressed decays D+→ K+π0π0 and D+→ K+π0η

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作者：
M. Ablikim
M. N. Achasov
P. Adlarson
S. Ahmed
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
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. Cetin
J. F. Chang
W. L. Chang
G. Chelkov
G. Chen
H. S. Chen
M. L. Chen
S. J. Chen
X. R. 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
机构：
[1] Institute of High Energy Physics,Turkish Accelerator Center Particle Factory Group
[2] Beihang University,Key Laboratory of Nuclear Physics and Ion
[3] Beijing Institute of Petrochemical Technology,beam Application (MOE) and Institute of Modern Physics
[4] Bochum Ruhr-University,State Key Laboratory of Nuclear Physics and Technology
[5] Carnegie Mellon University,School of Physics and Electronics
[6] Central China Normal University,Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter
[7] China Center of Advanced Science and Technology,Frontiers Science Center for Rare Isotopes
[8] COMSATS University Islamabad,Lanzhou Center for Theoretical Physics
[9] Fudan University,Department of Mathematical Sciences
[10] G.I. Budker Institute of Nuclear Physics SB RAS (BINP),undefined
[11] GSI Helmholtzcentre for Heavy Ion Research GmbH,undefined
[12] Guangxi Normal University,undefined
[13] Hangzhou Normal University,undefined
[14] Helmholtz Institute Mainz,undefined
[15] Henan Normal University,undefined
[16] Henan University of Science and Technology,undefined
[17] Henan University of Technology,undefined
[18] Huangshan College,undefined
[19] Hunan Normal University,undefined
[20] Hunan University,undefined
[21] Indian Institute of Technology Madras,undefined
[22] Indiana University,undefined
[23] INFN Laboratori Nazionali di Frascati,undefined
[24] INFN Sezione di Perugia,undefined
[25] University of Perugia,undefined
[26] INFN Sezione di Ferrara,undefined
[27] University of Ferrara,undefined
[28] Institute of Modern Physics,undefined
[29] Institute of Physics and Technology,undefined
[30] Jilin University,undefined
[31] Johannes Gutenberg University of Mainz,undefined
[32] Joint Institute for Nuclear Research,undefined
[33] Justus-Liebig-Universitaet Giessen,undefined
[34] II. Physikalisches Institut,undefined
[35] Lanzhou University,undefined
[36] Liaoning Normal University,undefined
[37] Liaoning University,undefined
[38] Nanjing Normal University,undefined
[39] Nanjing University,undefined
[40] Nankai University,undefined
[41] National Centre for Nuclear Research,undefined
[42] North China Electric Power University,undefined
[43] Peking University,undefined
[44] Qufu Normal University,undefined
[45] Shandong Normal University,undefined
[46] Shandong University,undefined
[47] Shanghai Jiao Tong University,undefined
[48] Shanxi Normal University,undefined
[49] Shanxi University,undefined
[50] Sichuan University,undefined
来源：
Journal of High Energy Physics | / 2022卷
关键词：
Branching fraction; Charm Physics; -; Experiments; Flavour Physics;
D O I：
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学科分类号：
摘要：
By analyzing e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we report the first observations of the doubly Cabibbo-suppressed decays D+→ K+π0π0 and D+→ K+π0η. The branching fractions of D+→ K+π0π0 and D+→ K+π0η are measured to be (2.1 ± 0.4stat ± 0.1syst) × 10−4 and (2.1 ± 0.5stat ± 0.1syst) × 10−4 with statistical significances of 8.8σ and 5.5σ, respectively. In addition, we search for the subprocesses D+→ K*(892)+π0 and D+→ K*(892)+η with K*(892)+→ K+π0. The branching fraction of D+→ K*(892)+η is determined to be (4.4−1.5stat+1.8\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$ {4.4}_{-{1.5}_{\mathrm{stat}}}^{+1.8} $$\end{document}± 0.2syst) × 10−4, with a statistical significance of 3.2σ. No significant signal for D+→ K*(892)+π0 is found and we set an upper limit on the branching fraction of this decay at the 90% confidence level to be 5.4 × 10−4.
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