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arXiv · 1512.02992

Search for the rare decay $D^0\toγγ$ at Belle

Belle Collaboration·N. K. Nisar·G. B. Mohanty·K. Trabelsi·T. Aziz·A. Abdesselam·I. Adachi·H. Aihara·D. M. Asner·V. Aulchenko·T. Aushev·R. Ayad·V. Babu·I. Badhrees·S. Bahinipati·E. Barberio·P. Behera·V. Bhardwaj·J. Biswal·A. Bobrov·A. Bozek·M. Bračko·F. Breibeck·T. E. Browder·D. Červenkov·V. Chekelian·A. Chen·B. G. Cheon·R. Chistov·K. Cho·V. Chobanova·Y. Choi·D. Cinabro·J. Dalseno·N. Dash·Z. Doležal·Z. Drásal·A. Drutskoy·D. Dutta·S. Eidelman·H. Farhat·J. E. Fast·B. G. Fulsom·V. Gaur·A. Garmash·R. Gillard·Y. M. Goh·P. Goldenzweig·D. Greenwald·O. Grzymkowska·J. Haba·T. Hara·K. Hayasaka·H. Hayashii·X. H. He·W. -S. Hou·K. Inami·A. Ishikawa·Y. Iwasaki·W. W. Jacobs·I. Jaegle·H. B. Jeon·D. Joffe·K. K. Joo·T. Julius·K. H. Kang·E. Kato·T. Kawasaki·C. Kiesling·D. Y. Kim·H. J. Kim·K. T. Kim·M. J. Kim·S. H. Kim·K. Kinoshita·P. Kodyš·S. Korpar·P. Križan·P. Krokovny·T. Kuhr·R. Kumar·T. Kumita·A. Kuzmin·Y. -J. Kwon·I. S. Lee·J. S. Lange·H. Li·L. Li·L. Li Gioi·J. Libby·D. Liventsev·P. Lukin·M. Masuda·D. Matvienko·K. Miyabayashi·H. Miyata·R. Mizuk·S. Mohanty·A. Moll·H. K. Moon
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Abstract

We search for the rare radiative decay $D^0\toγγ$ using a data sample with an integrated luminosity of $832{\rm fb^{-1}}$ recorded by the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. We find no statistically significant signal and set an upper limit on the branching fraction of ${\cal B}(D^0\toγγ)<8.5\times10^{-7}$ at $90\%$ confidence level. This is the most restrictive limit on the decay channel to date.

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Belle Collaboration, N. K. Nisar, G. B. Mohanty, K. Trabelsi, T. Aziz, A. Abdesselam, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, I. Badhrees, S. Bahinipati, E. Barberio, P. Behera, V. Bhardwaj, J. Biswal, A. Bobrov, A. Bozek, M. Bračko, F. Breibeck, T. E. Browder, D. Červenkov, V. Chekelian, A. Chen, B. G. Cheon, R. Chistov, K. Cho, V. Chobanova, Y. Choi, D. Cinabro, J. Dalseno, N. Dash, Z. Doležal, Z. Drásal, A. Drutskoy, D. Dutta, S. Eidelman, H. Farhat, J. E. Fast, B. G. Fulsom, V. Gaur, A. Garmash, R. Gillard, Y. M. Goh, P. Goldenzweig, D. Greenwald, O. Grzymkowska, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, X. H. He, W. -S. Hou, K. Inami, A. Ishikawa, Y. Iwasaki, W. W. Jacobs, I. Jaegle, H. B. Jeon, D. Joffe, K. K. Joo, T. Julius, K. H. Kang, E. Kato, T. Kawasaki, C. Kiesling, D. Y. Kim, H. J. Kim, K. T. Kim, M. J. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, T. Kuhr, R. Kumar, T. Kumita, A. Kuzmin, Y. -J. Kwon, I. S. Lee, J. S. Lange, H. Li, L. Li, L. Li Gioi, J. Libby, D. Liventsev, P. Lukin, M. Masuda, D. Matvienko, K. Miyabayashi, H. Miyata, R. Mizuk, S. Mohanty, A. Moll, H. K. Moon. 2015-12-09. Search for the rare decay $D^0\toγγ$ at Belle. https://doi.org/10.1103/physrevd.93.051102

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