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Epifanov, D. Joffe, D. Kotchetkov, D. Liventsev, D. M. Asner, D. \\v{C}ervenkov, D. Y. Kim, E. Guido, E. Nakano, E. Prencipe, E. Solovieva, E. Widmann, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. B. Jeon, H. Hayashii, H. Kichimi, H. Miyata, H. Ono, H. Park, H. Yamamoto, H. Ye, I. Adachi, I. S. Lee, J. Biswal, J. B. Kim, J. Dingfelder, J. E. Fast, J.-G. Shiu, J. Haba, J. Libby, J. Schueler, J. S. Lange, J. Yelton, K. Chilikin, K. Cho, K. Hayasaka, K. Huang, K. Inami, K. J. Nath, K. Kinoshita, K. K. Joo, K. Miyabayashi, K. Nishimura, K. Senyo, K. Tanida, K. T. Kim, K. Trabelsi, L. Cao, L. E. Piilonen, L. K. Li, L. Li Gioi, L. Santelj, M. Bra\\v{c}ko, M. E. Sevior, M. Gelb, M. Iwasaki, M. Lubej, M. Masuda, M. Merola, M. Nakao, M. Nayak, M. Niiyama, M. Ritter, M. Salehi, M. Stari\\v{c}, M. Sumihama, M. Takizawa, M. Uchida, M. Watanabe, N. Dash, N. Gabyshev, N. K. Nisar, O. Schneider, P. Behera, P. Chang, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Pakhlov, P. Wang, R. Ayad, R. Garg, R. Itoh, R. Kroeger, R. Mizuk, R. Mussa, R. Pestotnik, R. van Tonder, S. Al Said, S. Choudhury, S. C. Lee, S. Cunliffe, S. Di Carlo, S. Eidelman, S.E. Vahsen, S. H. Kim, S. Jia, S. Korpar, S. Nishida, S. Ogawa, S. Sandilya, S. Stani\\v{c}, S. Uno, S. Watanuki, S. Zakharov, T.-A. Shibata, T. Aushev, T. Bilka, T. E. Browder, T. Higuchi, T. Iijima, T. Julius, T. K. Pedlar, T. Kuhr, T. Kumita, T. Luo, T. Matsuda, T. Mori, T. Nanut, T. Sanuki, T. Sumiyoshi, T. Uglov, T. V. Dong, V. Aulchenko, V. Babu, V. Bansal, V. Bhardwaj, V. Chekelian, V. Gaur, V. Savinov, V. Zhilich, V. Zhukova, V. Zhulanov, W. Ostrowicz, W.-S. Hou, W. Sutcliffe, W. W. Jacobs, Y. B. Li, Y. Choi, Y. Iwasaki, Y. Jin, Y.-J. Kwon, Y. Sakai, Y. Seino, Y. Unno, Y. Usov, Y. Yusa, Z. P. Zhang","submitted_at":"2018-09-14T02:07:51Z","abstract_excerpt":"We report on the first Belle search for a light CP-odd Higgs boson, $A^{0}$, that decays into low mass dark matter, $\\chi$, in final states with a single photon and missing energy. We search for events produced via the dipion transition $\\Upsilon(\\textrm{2S})\\rightarrow\\Upsilon(\\textrm{1S})\\pi^{+}\\pi^{-}$, followed by the on-shell process $\\Upsilon(\\textrm{1S})\\rightarrow\\gamma A^{0}$ with $A^{0} \\rightarrow\\chi\\chi$, or by the off-shell process $\\Upsilon(\\textrm{1S})\\rightarrow\\gamma\\chi\\chi$. 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B. Kaliyar, A. Bobrov, A. Bozek, A. Chen, A. Frey, A. Garmash, A. Giri, A. Ishikawa, A. Kuzmin, A. M. Bakich, A. Rostomyan, A. Vinokurova, A. Vossen, A. Zupanc, B. Bhuyan, Belle Collaboration: I.S. Seong, B. G. Cheon, B. G. Fulsom, B. Golob, B. Pal, B. Wang, C. H. Wang, C. Kiesling, C.-L. Hsu, C. P. Shen, C. Schwanda, C. Van Hulse, C. Z. Yuan, D. Cinabro, D. Epifanov, D. Joffe, D. Kotchetkov, D. Liventsev, D. M. Asner, D. \\v{C}ervenkov, D. Y. Kim, E. Guido, E. Nakano, E. Prencipe, E. Solovieva, E. Widmann, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. B. Jeon, H. Hayashii, H. Kichimi, H. Miyata, H. Ono, H. Park, H. Yamamoto, H. Ye, I. Adachi, I. S. Lee, J. Biswal, J. B. Kim, J. Dingfelder, J. E. Fast, J.-G. Shiu, J. Haba, J. Libby, J. Schueler, J. S. Lange, J. Yelton, K. Chilikin, K. Cho, K. Hayasaka, K. Huang, K. Inami, K. J. Nath, K. Kinoshita, K. K. Joo, K. Miyabayashi, K. 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