Observation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msubsup><mml

We report a study of the semileptonic decays D^{+}→K_{S}^{0}π^{0}ℓ^{+}ν_{ℓ} (ℓ=e, μ) based on 20.3 fb^{-1} of e^{+}e^{-} collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector. The D^{+}→K_{S}^{0}π^{0}μ^{+}ν_{μ} decay is observed for the first time, with a branching fraction of (0.896±0.017_{stat}±0.008_{syst})%, and the branching fraction of D^{+}→K_{S}^{0}π^{0}e^{+}ν_{e} is determined with the improved precision as (0.943±0.012_{stat}±0.010_{syst})%. From the analysis of the dynamics, we observe that the dominant K[over ¯]^{*}(892)^{0} component is accompanied by an S-wave contribution, which accounts for (7.10±0.68_{stat}±0.41_{syst})% of the total decay rate of the μ^{+} channel and (6.39±0.17_{stat}±0.14_{syst})% of the e^{+} channel. Assuming a single-pole dominance parametrization, the hadronic form factor ratios are extracted to be r_{V}=V(0)/A_{1}(0)=1.42±0.03_{stat}±0.02_{syst} and r_{2}=A_{2}(0)/A_{1}(0)=0.75±0.03_{stat}±0.01_{syst}. Based on the first comprehensive angular and the decay-rate CP asymmetry analysis, the full set of averaged angular and CP asymmetry observables are measured as a function of the momentum-transfer squared; they are consistent with expectations from the standard model. No evidence for violation of μ-e lepton-flavor universality is observed in either the full range or the five chosen bins of momentum-transfer squared.

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Journal
Physical Review Letters
Published
2025-10-21
DOI
https://doi.org/10.1103/w9vz-4fq9
Primary Topic
Particle physics theoretical and experimental studies
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article
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Observation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msubsup><mml

J. J. Song, D. H. Zhang, Q. M. Li, J. R. Li et al.
Physical Review Letters
Particle physics theoretical and experimental studies
article

Observation of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>D</mml:mi></mml:mrow><mml:mrow><mml:mo>+</mml:mo></mml:mrow></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msubsup><mml

J. J. Song, D. H. Zhang, Q. M. Li, J. R. Li, D. Y. Wang, H. N. Li, Y. N. Wang, X. Dong, J. Jackson, Yuzhi Che, C. F. Redmer, G. Mezzadri, Y. B. Chen, Zengyun Hu, X. L. Ji, Y. S. Huang, C. Li, Xingqiu Yuan, J. K. Jiao, J. J. Wang, G. Chen, W. J. Zheng, Q. Liu, Y. J. Zeng, J. Y. Zhao, Z. Y. Yuan, N. Kumar, Z. A. Liu, G. Li, I. Garzia, G. Yu, X. Y. Shan, Y. J. Wang, X. H. Xie, T. J. Jiang, J. F. Qiu, Y. P. Guo, Z. Y. Deng, F. Nerling, X. Y. Zhang, H. R. Wei, X. Liu, X. M. Zhang, W. M. Liu, P. C. Jiang, M. Maggiora, J. F. Chang, Y. Schelhaas, H. J. Wang, X. R. Zheng, J. H. Zou, H. S. Chen, Y. T. Feng, F. Hanisch, Y. J. Song, S. A. Cetin, J. P. Zheng, Yaqian Wang, M. Scodeggio, Rongjie Yang, L. L., S. L. Hu, G. M. Liu, X. D. Yu, N. Berger, A. Calcaterra, Wenfang Xu, H. B. Jiang, K. J. Zhu, S. Qian, M. L. Chen, P. L. Li, X. R. Lyu, L. L. Wang, S. S. Fang, Y. C. Xu, L. Y. Tao, A. Limphirat, L. C. Liu, T. Y. Li, W. C. Yan, W. M. Song, J. G. Lü, F. Yan, Shixuan Du, S. L. Olsen, C. F. Xu, P. Egorov, Z. S. Xu, G. Y. Xiao, L. Q. Huang, Y. Sun, G. R. Liao, M. Tat, I. Denisenko, I. Uman, W. K. Liu, Z. K. Chen, C. Li, Y. Raghu Reddy, Y. F. Lyu, X. L. Li, F. M. Melendi, Y. J. Wu, Z. J. Ye, Y. J. Su, Y. Y. Peng, J. Zhang, J. B. Jiao, R. Li, A. Rivetti, W. Z. Zhu, Y. F. Liang, S. S. Su, Y. P. Huang, W. Ji, Hao Sun, C. Q. Feng, H. L. Yang, P. C. Hong, J. L. Ping, G. F. Cao, J. Muskalla, H. N. Li, M. H. Cai, K. Begzsuren, X. N. Wang, Zhuo Zhang, J. Gutiérrez, F. De Mori, Y. L. Xiao, Y. Hu, J. X. Teng, N. Huesken, N. Zhang, X. H. Li, Y. Zhang, R. Aliberti, L. Q. Lin, Z. D. Liu, F. Feldbauer, X. Y. Chen, J. Zu, X. Liu, T. Hu, Z. Y. Wang, Q. Hu, J. L. Qin, X. Z. Li, X. K. Liu, A. Gilman, Q. X. Li, C. Zhong, Z. L. Zhang, N. Salone, T. Liu, G. Felici, Y. M. Zhang, X. L. Wang, K. J. Xie, V. Batozskaya, M. Lellmann, X. S. Kang, M. R. Li, Shuai Shi, Z. J. Chen, Z. Y. You, M. H. Li, J. Zhang, C. H. Heinz, H. H. Liu, B. A. Shi, O. Bakina, W. J. Zhu, S. Marcello, F. Weidner, X. T. Hou, J. J. Tang, Y. Zhang, A. Zhemchugov, Y. H. Lyu, M. X. Luo, M. Y. Dong, I. Mackay, J. D. Gong, P. L. Liu, F. A. Harris, Y. Wang, C. Herold, M. Rolo, Lijie Zhu, G. Zhao, R. E. de Boer, X. Y. Zhou, Y. Z. Zhou, Z. P. Xie, W. H. Tian, P. B. Qin, J. F. Hu, A. Pathak, X. Y. Shen, Y. R. Hou, Miao Hu, D. Jiang, F. E. Maas, Zh. Zh. Zhang, T. Chen, Y. J. Zeng, Y. P. Zhang, S. X. Li, M. Kavatsyuk, M. J. Guo, Y. Q. Wang, W. P. Wang, G. Y. Tang, Y. H. Meng, W. D. Li, H. K. Sun, H. J. Li, M. H. Liu, D. Bettoni, J. P. Dai, K. Li, S.-K. Choi, F. Li, T. Li, J. R. Luo, Y. Ding, Z. Z. Zhang, L. Fava, J. Y. Zhang, Yu Ye, M. Pelizaeus, J. L., L. J. Li, A. M. Marshall, Q. Zhang, J. X. Zhang, Xurong Chen, Y. T. Zhang, S. Garbolino, R. Q., Jianying Zhou, X. T. Chen, Q. Y. Zhang, F. H. Heinsius, M. Wang, W. B. Yan, R. Farinelli, F. C., M. Wang, K. Götzen, Huaqiao Zhang, A. Brueggemann, Z. H. Zhang, T. Luo, J. J. Liu, W. G. Li, W. D. Zhu, X. J. Peng, Yu Bai, M. Ablikim, H. Y. Zhang, Shujun Zhao, Q. P. Ji, Z. H. Qin, A. Bortone, S. C. Yuan, M. Kuessner, Y. T. Liang, M. Fritsch, L. J. Wu, J. Z. Zhang, C. K. Li, M. Destefanis, P. Adlarson, P. R. Li, J. B. Liu, L. Z. Zhu, Yu Liu, A. N. Zhu, H. R. Zhang, X. Y. Liu, C. P. Shen, Yunyou Duan, D. Xiao, S. Gramigna, Yang Gao, O. B. Kolcu, H. X. Mao, C. Xie, F. Stieler, M. C. Du, P. Zhang, Y. H. Zhang, J. Libby, Xu Yan, C. X. Liu, He Ping Zhou, M. Q. Jing, H. H. Liu, T. Wang, H. B. Li, K. K. He, Z. Q. Liu, S. Wu, Y. Gao, A. Q. Zhang, J. Q. Zhang, T. J. Wang, T. T. Lei, C. Z. Yuan, M. Ye, A. Khoukaz, L. W. Wang, Z. A. Zhu, X. Zeng, Xiaoli Lu, Q. M., Y. G. Li, Hangchang Zhang, S. S. Sun, H. Liu, R. Y. Zhang, C. X. Yue, Y. Y. Ji, J. L. Shi, H. Xiao, X. T., A. Dbeyssi, M. Q. Ruan, M. H. Gu, X. P. Xu, L. G. Shao, H. F. Shen, T. J. Zhu, G. Cibinetto, U. Wiedner, D. M. Li, Y. Liu, X. Q. Hao, D. Dedovich, A. Amoroso, B. J. Liu, W. H. Yan, X. T. Huang, X. X. Ding, T. Z. Song, J. Q. Zhou, W. X. Fang, C. L. Luo, X. K. Zhou, J. H. Feng, F. H. Liu, J. J. Zhang, H. 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article en

Abstract

We report a study of the semileptonic decays D^{+}→K_{S}^{0}π^{0}ℓ^{+}ν_{ℓ} (ℓ=e, μ) based on 20.3 fb^{-1} of e^{+}e^{-} collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector. The D^{+}→K_{S}^{0}π^{0}μ^{+}ν_{μ} decay is observed for the first time, with a branching fraction of (0.896±0.017_{stat}±0.008_{syst})%, and the branching fraction of D^{+}→K_{S}^{0}π^{0}e^{+}ν_{e} is determined with the improved precision as (0.943±0.012_{stat}±0.010_{syst})%. From the analysis of the dynamics, we observe that the dominant K[over ¯]^{*}(892)^{0} component is accompanied by an S-wave contribution, which accounts for (7.10±0.68_{stat}±0.41_{syst})% of the total decay rate of the μ^{+} channel and (6.39±0.17_{stat}±0.14_{syst})% of the e^{+} channel. Assuming a single-pole dominance parametrization, the hadronic form factor ratios are extracted to be r_{V}=V(0)/A_{1}(0)=1.42±0.03_{stat}±0.02_{syst} and r_{2}=A_{2}(0)/A_{1}(0)=0.75±0.03_{stat}±0.01_{syst}. Based on the first comprehensive angular and the decay-rate CP asymmetry analysis, the full set of averaged angular and CP asymmetry observables are measured as a function of the momentum-transfer squared; they are consistent with expectations from the standard model. No evidence for violation of μ-e lepton-flavor universality is observed in either the full range or the five chosen bins of momentum-transfer squared.

Physical Review LettersVol. 135(17)
University of Science and Technology Liaoning (CN), University of Hawaiʻi at Mānoa (US), Liaoning University (CN), Università degli Studi del Piemonte Orientale “Amedeo Avogadro” (IT), Uppsala University (SE), University of Science and Technology of China (CN), University of Hawaii System (US), Mongolian Academy of Sciences (MN), Central South University (CN), Guangxi University (CN), Nanjing Normal University (CN), Liaoning Normal University (CN), North China Electric Power University (CN), Shandong University (CN), Sun Yat-sen University (CN), COMSATS University Islamabad (PK), Hangzhou Normal University (CN), Hunan University (CN), Henan University of Science and Technology (CN), University of Groningen (NL), GSI Helmholtz Centre for Heavy Ion Research (DE), University of the Punjab (PK), Hunan Normal University (CN), Henan University (CN), Shanxi University (CN), Shanghai Jiao Tong University (CN), Yantai University (CN), University of Tarapacá (CL), Guangxi University of Science and Technology (CN), South China Normal University (CN), Yunnan University (CN), Jilin University (CN), Johannes Gutenberg University Mainz (DE), Justus-Liebig-Universität Gießen (DE), University of Ferrara (IT), Qufu Normal University (CN), Peking University (CN), Nankai University (CN), University of Münster (DE), Sichuan University (CN), Indian Institute of Technology Madras (IN), Fudan University (CN), Inner Mongolia University (CN), University of Perugia (IT), Shandong Normal University (CN), University of Manchester (GB), Guangxi Normal University (CN), China University of Geosciences (CN), Huangshan University (CN), Joint Institute for Nuclear Research (RU), University of Jinan (CN), Henan University of Technology (CN), University of Bristol (GB), Wuhan University (CN), Zhengzhou University (CN), Soochow University (CN), University of Oxford (GB), Central China Normal University (CN), National Centre for Nuclear Research (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Helmholtz Institute Mainz (DE), Indiana University Bloomington (US), Istinye University (TR), Siberian Branch of the Russian Academy of Sciences (RU), Institute of Modern Physics (CN), Jilin Medical University (CN), Institute of High Energy Physics (CN), Shanxi University of Traditional Chinese Medicine (CN), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Piedmont University (US), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Hebei University (CN), Budker Institute of Nuclear Physics (RU), China Center of Advanced Science and Technology (CN), University of Turin (IT), Indiana University (US), Chung-Ang University (KR), Near East University (CY), Carnegie Mellon University (US), Henan Normal University (CN), Zhejiang University (CN), Lanzhou University (CN), Southeast University (CN), Renmin University of China (CN), Suranaree University of Technology (TH), Beihang University (CN), Nanjing University (CN), Ruhr University Bochum (DE), University of South China (CN), Shanxi Normal University (CN), Tsinghua University (CN)
U.S. Department of Energy, Strong, National Research Foundation, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Chinese Academy of Sciences, National Research Foundation of Korea, Knut och Alice Wallenbergs Stiftelse, Vetenskapsrådet, Istituto Nazionale di Fisica Nucleare, Shanghai Key Laboratory for Particle Physics and Cosmology, Agencia Nacional de Investigación y Desarrollo, Institute of High Energy Physics
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Particle physics theoretical and experimental studies
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