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Asner, D. Matvienko, D. Semmler, D. \\v{C}ervenkov, D. Y. Kim, E. Barberio, E. Kato, E. Nakano, E. Won, F. Simon, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Pakhlova, G. Schnell, G. Varner, H. Aihara, H. B. Jeon, H. Farhat, H. Hayashii, H. K. Moon, H. Miyata, H. Park, H. Ye, I. Adachi, I. Badhrees, I. Jaegle, I. S. Lee, J. Biswal, J. B. Kim, J. Dalseno, J. E. Fast, J.-G. Shiu, J. Libby, J. Rauch, J. Stypula, J. Yamaoka, K. Chilikin, K. Cho, K. E. Varvell, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. Miyabayashi, K. Negishi, K. Senyo, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. Li, L. Li Gioi, L. Santelj, M. Bra\\v{c}ko, M. Danilov, M. E. Sevior, M. Heck, M. J. Kim, M. Lubej, M. Masuda, M. Nakao, M. Nayak, M. N. Wagner, M. Petri\\v{c}, M. Ritter, M. Stari\\v{c}, M. Uchida, M. V. Purohit, M.-Z. Wang, N. Dash, N. Gabyshev, N. K. Nisar, O. Grzymkowska, O. Schneider, O. Seon, P. Behera, P. Goldenzweig, P. Katrenko, P. Kodys, P. Kri\\v{z}an, P. Krokovny, P. Lukin, P. Pakhlov, P. Urquijo, P. Vanhoefer, P. Wang, R. Chistov, R. Gillard, R. Itoh, R. Mizuk, R. Mussa, S. Eidelman, S. H. Kim, S. Korpar, S. Mohanty, S. Nishida, S. Ogawa, S. Okuno, S. Ryu, S. Sandilya, S. Stani\\v{c}, S. Uno, S. Yashchenko, T.-A. Shibata, T. Aushev, T. E. Browder, T. Ferber, T. Hara, T. Iijima, T. Julius, T. K. Pedlar, T. Sanuki, T. Schl\\\"uter, T. Sumiyoshi, T. Uglov, U. Tamponi, V. Babu, V. Bhardwaj, V. Chekelian, V. Chobanova, V. Gaur, V. Shebalin, V. Zhilich, V. Zhulanov, W.-S. Hou, Y. Choi, Y. Iwasaki, Y.-J. Kwon, Y. Li, Y. M. Goh, Y. Sakai, Y. Sato, Y. Seino, Y. Teramoto, Y. Unno, Y. Usov, Y. Watanabe, Y. Yook, Y. Yusa, Z. Dole\\v{z}al, Z. P. Zhang","submitted_at":"2016-05-14T15:45:47Z","abstract_excerpt":"We present a search for a non-Standard-Model invisible particle $X^0$ in the mass range $0.1\\textrm{-}1.8 \\,{\\rm GeV}/{c^2}$ in $B^{+}\\to e^{+} X^{0}$ and $B^{+}\\to \\mu^{+} X^{0}$ decays. 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Bozek, A. Chen, A. Garmash, A. Ishikawa, A. J. Schwartz, A. Kuzmin, A. M. Bakich, A. Moll, A. Rostomyan, A. Sokolov, A. Zupanc (The Belle Collaboration), B. G. Cheon, B. G. Fulsom, B. Pal, B. Shwartz, C. H. Li, C. H. Wang, C. P. Shen, C. Pulvermacher, C. Schwanda, C.-S. Park, C. Van Hulse, C. W. Park, D. Cinabro, D. Dutta, D. Liventsev, D. M. Asner, D. Matvienko, D. Semmler, D. \\v{C}ervenkov, D. Y. Kim, E. Barberio, E. Kato, E. Nakano, E. Won, F. Simon, G. B. Mohanty, G. Bonvicini, G. Inguglia, G. Pakhlova, G. Schnell, G. Varner, H. Aihara, H. B. Jeon, H. Farhat, H. Hayashii, H. K. Moon, H. Miyata, H. Park, H. Ye, I. Adachi, I. Badhrees, I. Jaegle, I. S. Lee, J. Biswal, J. B. Kim, J. Dalseno, J. E. Fast, J.-G. Shiu, J. Libby, J. Rauch, J. Stypula, J. Yamaoka, K. Chilikin, K. Cho, K. E. Varvell, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. Miyabayashi, K. Negishi, K. Senyo, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. Li, L. Li Gioi, L. Santelj, M. Bra\\v{c}ko, M. Danilov, M. E. Sevior, M. Heck, M. J. Kim, M. Lubej, M. Masuda, M. Nakao, M. Nayak, M. N. Wagner, M. Petri\\v{c}, M. Ritter, M. Stari\\v{c}, M. Uchida, M. V. Purohit, M.-Z. Wang, N. Dash, N. Gabyshev, N. K. Nisar, O. Grzymkowska, O. Schneider, O. Seon, P. Behera, P. Goldenzweig, P. Katrenko, P. Kodys, P. Kri\\v{z}an, P. Krokovny, P. Lukin, P. Pakhlov, P. Urquijo, P. Vanhoefer, P. Wang, R. Chistov, R. Gillard, R. Itoh, R. Mizuk, R. Mussa, S. Eidelman, S. H. Kim, S. Korpar, S. Mohanty, S. Nishida, S. Ogawa, S. Okuno, S. Ryu, S. Sandilya, S. Stani\\v{c}, S. Uno, S. Yashchenko, T.-A. Shibata, T. Aushev, T. E. Browder, T. Ferber, T. Hara, T. Iijima, T. Julius, T. K. Pedlar, T. Sanuki, T. Schl\\\"uter, T. Sumiyoshi, T. Uglov, U. Tamponi, V. Babu, V. Bhardwaj, V. Chekelian, V. Chobanova, V. Gaur, V. Shebalin, V. Zhilich, V. Zhulanov, W.-S. Hou, Y. Choi, Y. Iwasaki, Y.-J. Kwon, Y. Li, Y. M. Goh, Y. Sakai, Y. Sato, Y. Seino, Y. Teramoto, Y. Unno, Y. Usov, Y. Watanabe, Y. Yook, Y. Yusa, Z. 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