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No significant signal is observed, and the upper limits on the branching fraction at the 90\\% confidence level are set to be $\\mathcal{B}\\,(D^0 \\to K^- \\pi^- e^+ e^+)<2.8\\times10^{-6}$, $\\mathcal{B}\\,(D^+ \\to K_S^0 \\pi^- e^+ e^+)<3.3\\times10^{-6}$ and $\\mathcal{B}\\,(D^+ \\to K^- \\pi^0 e^+ e^+)<8.5\\times10^{-6}$. The Majorana neutrino is searched for with different mass assumptions rang","authors_text":"A. Amoroso, A. A. Zafar, A. Calcaterra, A. Dbeyssi, A. Denig, A. Gilman, A. Guskov, A. Julin, A. Khoukaz, A. Kupsc, A. Mangoni, A. Mustafa, A. N. Zhu, A. Pitka, A. Q. Guo, A. Rivetti, A. Sarantsev, A. Yuncu, A. Zhemchugov, B. C. Ke, BESIII Collaboration: M. Ablikim, B. Garillon, B. J. Liu, B. Kopf, B. Liu, B. L. Wang, B. S. Zou, B. Tsednee, B. Wang, B. X. Yu, B. X. Zhang, B. Y. Zhang, B. Zheng, B. Zhong, C. C. Zhang, C. D. Fu, C. Dong, C. F. Qiao, C. F. Redmer, Cheng Li, Ch. Rosner, C. J. Tang, C. Li, C. L. Luo, C. Morales Morales, C. P. Shen, C. Q. Feng, C. Sowa, C. X. 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Qiu, J. F. Sun, J. G. Lu, J. G. Messchendorp, J. H. Yin, J. H. Zou, Jin Li, J. J. Song, J. J. Xu, J. Libby, J. L. Ping, J. L. Zhang, J. Min, J. P. Dai, J. Pellegrino, J. Pettersson, J. P. Zheng, J. Q. Zhang, J. S. Huang, J. S. Lange, J. S. Yu, J. V. Bennett, J. W. Li, J. W. Zhang, J. W. Zhao, J. Y. Liu, J. Y. Zhang, J. Y. Zhao, J. Z. Bai, J. Zhang, J. Zhu, J. Zhuang, J. Z. Zhang, J. Z. Zhao, Kang Li, K. Begzsuren, Ke Li, Ke Liu, K. Goetzen, K. H. Rashid, K. J. Li, K. J. Zhu, K. L. He, K. Liu, K. Peters, K. Schoenning, K. Wang, K. Y. Liu, K. Zhang, K. Zhu, L. D. Liu, Lei Li, Lei Zhao, L. Fava, L. Gong, L. H. Wu, Ling Zhao, L. J. Wu, L. Koch, L. Lavezzi, L. L. Ma, L. L. Wang, L. Sun, L. S. Wang, L. Xia, L. Xu, L. Yan, L. Yang, L. Y. Dong, L. Zhang, L. Zhou, L. Z. Liao, M. Albrecht, M. Alekseev, M. Bertani, M. Destefanis, Meng Wang, M. Fritsch, M. Greco, M. G. Zhao, M. H. Gu, M. H. Ye, M. Irshad, M. Kavatsyuk, M. Kornicer, M. Kuemmel, M. Kuessner, M. Kurth, M. L. Chen, M. Maggiora, M. M. 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Khan, T. Luo, T. Ma, T. Weber, T. .Y. Qi, U. Wiedner, V. Prasad, W. B. Yan, W. Cheng, W. C. Yan, W. D. Li, W. G. Li, W. Gradl, W. Ikegami Andersson, W. K\\\"uhn, W. M. Song, W. P. Wang, W. Shan, W. X. Gong, X. A. Xiong, X. B. Ji, X. Cai, X. C. Lou, X. F. Wang, X. H. Mo, X. H. Sun, Xiaoyu Zhou, X. K. Chu, X. K. Zhou, X. L. Gao, X. Liu, X. L. Ji, X. L. Li, X. L. Luo, X. L. Wang, X. L. Zhu, X. N. Li, X. N. Ma, X. P. Xu, X. Q. Hao, X. Q. He, X. Q. Li, X. R. Chen, X. R. Lyu, X. R. Zhou, X. Shi, X. S. Jiang, X. S. Kang, X. S. Qin, X. Tang, X. T. Huang, Xu Zhou, X. Y. Jiang, X. Y. Ma, X. Y. Niu, X. Y. Shan, X. Y. Shen, X. Y. Song, X. Y. Zhang, X. Y. Zhou, X. Zhou, X. Z. Huang, Yang Zhang, Yao Zhang, Y. Bai, Y. Ban, Y. B. Chen, Y. B. Liu, Y. B. Zhao, Y. C. Zhu, Y. Ding, Y. Fang, Y. F. Liang, Y. F. Long, Y. F. Wang, Y. Gao, Y. G. Gao, Y. G. Xie, Y. Hu, Y. H. Xie, Y. H. Yan, Y. H. Yang, Y. H. Zhang, Y. H. Zheng, Yifan Yang, Yi Zhang, Y. Jin, Y. J. Mao, Y. J. Mo, Y. J. Sun, Y. J. Xiao, Y. K. 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