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Semmler, D. \\v{C}ervenkov, D. Y. Kim, E. Barberio, E. Nakano, E. Widmann, E. Won, F. Simon, F. Tenchini, G. B. Mohanty, G. Inguglia, G. Schnell, G. Varner, H. Aihara, H. B. Jeon, H. Farhat, H. Hayashii, H. Miyata, H. Nakazawa, H. Sahoo, H. Ye, I. Adachi, I. Badhrees, I. Jaegle, I. S. Lee, I. S. Seong, J. Biswal, J. B. Kim, J. E. Fast, J.-G. Shiu, J. Haba, J. Libby, J. Rauch, J. S. Lange, J. Yamaoka, K. Chilikin, K. Cho, K. E. Varvell, K. Hayasaka, K. H. Kang, K. Inami, K. J. Nath, K. Kinoshita, K. K. Joo, K. Miyabayashi, K. Senyo, K. T. Kim, K. Trabelsi, L. E. Piilonen, L. Li, L. Li Gioi, L. Santelj, M. Bra\\v{c}ko, M. J. Kim, M. Masuda, M. Nakao, M. Nayak, M. Ritter, M. Stari\\v{c}, M. Takizawa, M. Uchida, M. Watanabe, M.-Z. Wang, N. Dash, N. Gabyshev, O. Schneider, O. Seon, P. Behera, P. Goldenzweig, P. Kody\\v{s}, P. Kri\\v{z}an, P. Krokovny, P. Pakhlov, P. Urquijo, R. Ayad, R. Chistov, R. Gillard, R. Itoh, R. Kulasiri, R. Mizuk, S. Al Said, S. Di Carlo, S. Eidelman, S. H. Kim, S. Nishida, S. Ogawa, S. Okuno, S. Paul, S. Sandilya, S. Uehara, S. Uno, T.-A. Shibata, T. Aushev, T. Ferber, T. Iijima, T. Julius, T. Kawasaki, T. K. Pedlar, T. Kuhr, T. Luo, T. Matsuda, T. Nanut, T. Sanuki, T. Schl\\\"uter, T. Sumiyoshi, T. Uglov, U. Tamponi, V. Bansal, V. Chekelian, V. Chobanova, V. Gaur, V. Savinov, V. Shebalin, V. Vorobyev, V. Zhilich, V. Zhukova, V. Zhulanov, W.-S. Hou, Y. Choi, Y. Iwasaki, Y. J. Kim, Y.-J. Kwon, Y. Li, Y. Sakai, Y. Sato, Y. Seino, Y. Unno, Y. Usov, Y. Watanabe, Y. Yook, Y. Yusa, Z. Dole\\v{z}al, Z. Dr\\'asal, Z. Natkaniec, Z. P. Zhang","submitted_at":"2016-09-19T05:10:38Z","abstract_excerpt":"We report a search for a dark vector gauge boson $U^\\prime$ that couples to quarks in the decay chain $D^{*+} \\to D^0 \\pi^+, D^0 \\to K^0_S \\eta, \\eta \\to U^\\prime \\gamma$, $U^\\prime \\to \\pi^+ \\pi^-$. 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