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Tenchini, G. B. Mohanty, G. Bonvicini, G. Karyan, G. Pakhlova, G. Russo, G. Schnell, G. Varner, H. Aihara, H. B. Jeon, H. E. Cho, H. Hayashii, H. Kichimi, H. Miyata, H. Ono, H. Park, H. Ye, I. Adachi, I. Badhrees, I. S. Lee, J. Bennett, J. Biswal, J. E. Fast, J.-G. Shiu, J. H. Yin, J. Libby, J. Schueler, J. Yelton, K. Chilikin, K. Cho, K. Hayasaka, K. Inami, K. Kinoshita, K. K. Joo, K. Lieret, K. Miyabayashi, K. Nishimura, K. Senyo, K. Tanida, K. T. Kim, K. Trabelsi, L. Cao, L. E. Piilonen, L. Li Gioi, M. Bracko, M. Campajola, M. E. Sevior, M. Iwasaki, M. Masuda, M. Merola, M. Nakao, M. Nayak, M. Ritter, M. Staric, M. Takizawa, M. T. Prim, M. Uchida, M.-Z. Wang, N. Gabyshev, N. K. Nisar, N. Rout, O. Grzymkowska, O. Hartbrich, O. Schneider, P. Behera, P. Goldenzweig, P. Katrenko, P. Kodys, P. Lewis, P. Oskin, P. Pakhlov, P. Urquijo, P. Wang, R. Garg, R. Itoh, R. Kroeger, R. Mizuk, R. Mussa, R. Pestotnik, R. van Tonder, S. Al Said, S. Bahinipati, S. B. Yang, S. Choudhury, S. C. Lee, S. Cunliffe, S. Di Carlo, S. Eidelman, S. H. Kim, S.-H. Park, S. Jia, S.-K. Choi, S. Korpar, S. Nishida, S. Pardi, S. Paul, S. Sandilya, S. Uehara, S. Uno, T. Aushev, T. Iijima, T. J. Moon, T. K. Pedlar, T. Kuhr, T. Matsuda, T. Mori, T. Nakano, T. Pang, T. Sanuki, T. Sumiyoshi, T. Uglov, T. V. Dong, U. Tamponi, V. Bhardwaj, V. Chekelian, V. Gaur, V. Popov, V. Savinov, V. Zhilich, V. Zhukova, W.-S. Hou, W. Sutcliffe, W. W. Jacobs, X. L. Wang, Y. B. Li, Y. Choi, Y. Iwasaki, Y. Jin, Y. Onuki, Y. Sakai, Y. Seino, Y. Unno, Y. Usov, Y. Yusa, Z. Dolezal, Z. P. Zhang, Z. S. Stottler","submitted_at":"2019-10-24T05:10:00Z","abstract_excerpt":"We report the first observation of the radiative decay of the $\\Upsilon(1S)$ into a charmonium state. The statistical significance of the observed signal of $\\Upsilon(1S) \\to \\gamma \\chi_{c1}$ is 6.3 standard deviations including systematics. 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