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arxiv: 1512.02992 · v1 · pith:K6RV47FOnew · submitted 2015-12-09 · ✦ hep-ex

Search for the rare decay D⁰toγγ at Belle

Belle Collaboration: N. K. Nisar , G. B. Mohanty , K. Trabelsi , T. Aziz , A. Abdesselam , I. Adachi , H. Aihara , D. M. Asner
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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. Bra\v{c}ko F. Breibeck T. E. Browder D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon R. Chistov K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno N. Dash Z. Dole\v{z}al Z. Dr\'asal 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. Kody\v{s} S. Korpar P. Kri\v{z}an 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 T. Mori R. Mussa E. Nakano M. Nakao T. Nanut Z. Natkaniec M. Nayak M. Niiyama S. Nishida S. Ogawa S. Okuno P. Pakhlov G. Pakhlova B. Pal C. W. Park H. Park S. Paul T. K. Pedlar L. Pes\'antez R. Pestotnik M. Petri\v{c} L. E. Piilonen K. Prasanth C. Pulvermacher J. Rauch E. Ribe\v{z}l M. Ritter A. Rostomyan S. Ryu H. Sahoo S. Sandilya T. Sanuki Y. Sato V. Savinov T. Schl\"uter O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino K. Senyo O. Seon I. S. Seong V. Shebalin T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon J. B. Singh Y.-S. Sohn E. Solovieva S. Stani\v{c} M. Stari\v{c} J. Stypula M. Sumihama T. Sumiyoshi U. Tamponi Y. Teramoto M. Uchida T. Uglov S. Uno P. Urquijo C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell A. Vinokurova A. Vossen M. N. Wagner C. H. Wang M.-Z. Wang X. L. Wang M. Watanabe Y. Watanabe K. M. Williams E. Won J. Yelton C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc
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keywords gammadecaybellelimitraresearchasymmetric-energybranching
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We search for the rare radiative decay $D^0\to\gamma\gamma$ 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 ${\cal B}(D^0\to\gamma\gamma)<8.5\times10^{-7}$ at $90\%$ confidence level. This is the most restrictive limit on the decay channel to date.

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