Search for the rare decay $D^0\toγγ$ at Belle
Creators: name: Belle Collaboration
name: Nisar, N. K.
name: Mohanty, G. B.
name: Trabelsi, K.
name: Aziz, T.
name: Abdesselam, A.
name: Adachi, I.
name: Aihara, H.
name: Asner, D. M.
name: Aulchenko, V.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Badhrees, I.
name: Bahinipati, S.
name: Barberio, E.
name: Behera, P.
name: Bhardwaj, V.
name: Biswal, J.
name: Bobrov, A.
name: Bozek, A.
name: Bračko, M.
name: Breibeck, F.
name: Browder, T. E.
name: Červenkov, D.
name: Chekelian, V.
name: Chen, A.
name: Cheon, B. G.
name: Chistov, R.
name: Cho, K.
name: Chobanova, V.
name: Choi, Y.
name: Cinabro, D.
name: Dalseno, J.
name: Dash, N.
name: Doležal, Z.
name: Drásal, Z.
name: Drutskoy, A.
name: Dutta, D.
name: Eidelman, S.
name: Farhat, H.
name: Fast, J. E.
name: Fulsom, B. G.
name: Gaur, V.
name: Garmash, A.
name: Gillard, R.
name: Goh, Y. M.
name: Goldenzweig, P.
name: Greenwald, D.
name: Grzymkowska, O.
name: Haba, J.
name: Hara, T.
name: Hayasaka, K.
name: Hayashii, H.
name: He, X. H.
name: Hou, W. -S.
name: Inami, K.
name: Ishikawa, A.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jaegle, I.
name: Jeon, H. B.
name: Joffe, D.
name: Joo, K. K.
name: Julius, T.
name: Kang, K. H.
name: Kato, E.
name: Kawasaki, T.
name: Kiesling, C.
name: Kim, D. Y.
name: Kim, H. J.
name: Kim, K. T.
name: Kim, M. J.
name: Kim, S. H.
name: Kinoshita, K.
name: Kodyš, P.
name: Korpar, S.
name: Križan, P.
name: Krokovny, P.
name: Kuhr, T.
name: Kumar, R.
name: Kumita, T.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Lee, I. S.
name: Lange, J. S.
name: Li, H.
name: Li, L.
name: Gioi, L. Li
name: Libby, J.
name: Liventsev, D.
name: Lukin, P.
name: Masuda, M.
name: Matvienko, D.
name: Miyabayashi, K.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, S.
name: Moll, A.
name: Moon, H. K.
name: Mori, T.
name: Mussa, R.
name: Nakano, E.
name: Nakao, M.
name: Nanut, T.
name: Natkaniec, Z.
name: Nayak, M.
name: Niiyama, M.
name: Nishida, S.
name: Ogawa, S.
name: Okuno, S.
name: Pakhlov, P.
name: Pakhlova, G.
name: Pal, B.
name: Park, C. W.
name: Park, H.
name: Paul, S.
name: Pedlar, T. K.
name: Pesántez, L.
name: Pestotnik, R.
name: Petrič, M.
name: Piilonen, L. E.
name: Prasanth, K.
name: Pulvermacher, C.
name: Rauch, J.
name: Ribežl, E.
name: Ritter, M.
name: Rostomyan, A.
name: Ryu, S.
name: Sahoo, H.
name: Sandilya, S.
name: Sanuki, T.
name: Sato, Y.
name: Savinov, V.
name: Schlüter, T.
name: Schneider, O.
name: Schnell, G.
name: Schwanda, C.
name: Schwartz, A. J.
name: Seino, Y.
name: Senyo, K.
name: Seon, O.
name: Seong, I. S.
name: Shebalin, V.
name: Shibata, T. -A.
name: Shiu, J. -G.
name: Shwartz, B.
name: Simon, F.
name: Singh, J. B.
name: Sohn, Y. -S.
name: Solovieva, E.
name: Stanič, S.
name: Starič, M.
name: Stypula, J.
name: Sumihama, M.
name: Sumiyoshi, T.
name: Tamponi, U.
name: Teramoto, Y.
name: Uchida, M.
name: Uglov, T.
name: Uno, S.
name: Urquijo, P.
name: Van Hulse, C.
name: Vanhoefer, P.
name: Varner, G.
name: Varvell, K. E.
name: Vinokurova, A.
name: Vossen, A.
name: Wagner, M. N.
name: Wang, C. H.
name: Wang, M. -Z.
name: Wang, X. L.
name: Watanabe, M.
name: Watanabe, Y.
name: Williams, K. M.
name: Won, E.
name: Yelton, J.
name: Yuan, C. Z.
name: Yusa, Y.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhulanov, V.
name: Zupanc, A.
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: 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 ${\cal B}(D^0\toγγ)&lt;8.5\times10^{-7}$ at $90\%$ confidence level. This is the most restrictive limit on the decay channel to date.