Search for D⁰ decays to invisible final states at Belle

Y.-T. Lai , M.-Z. Wang , I. Adachi , H. Aihara , S. Al Said , D. M. Asner , T. Aushev , R. Ayad

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I. Badhrees A. M. Bakich V. Bansal E. Barberio M. Berger V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov A. Bozek M. Bra\v{c}ko D. \v{C}rvenkov P. Chang A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho V. Chobanova Y. Choi D. Cinabro N. Dash S. Di Carlo Z. Dole\v{z}al D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard P. Goldenzweig B. Golob K. Hayasaka W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki W. W. Jacobs I. Jaegle H. B. Jeon D. Joffe K. K. Joo T. Julius K. H. Kang T. Kawasaki D. Y. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita P. Kody\v{s} D. Kotchetkov P. Krokovny T. Kuhr R. Kulasiri Y.-J. Kwon J. S. Lange I. S. Lee C. H. Li L. Li Y. Li L. Li Gioi J. Libby D. Liventsev M. Masuda T. Matsuda D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. Mohanty E. Nakano M. Nakao H. Nakazawa T. Nanut K. J. Nath Z. Natkaniec M. Nayak S. Nishida S. Ogawa S. Okuno P. Pakhlov B. Pal H. Park S. Paul T. K. Pedlar L. E. Piilonen C. Pulvermacher J. Rauch M. Ritter H. Sahoo Y. Sakai S. Sandilya Y. Sato V. Savinov T. Schl\"uter O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino D. Semmler K. Senyo I. S. Seong V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu F. Simon E. Solovieva M. Stari\v{c} J. Stypula T. Sumiyoshi M. Takizawa U. Tamponi F. Tenchini K. Trabelsi M. Uchida S. Uehara T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse G. Varner K. E. Varvell V. Vorobyev C. H. Wang M. Watanabe Y. Watanabe E. Widmann E. Won Y. Yamashita H. Ye Y. Yook C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc

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classification ✦ hep-ex

keywords finalinvisiblestatesbellebranchingdecaysfractionparticle

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We report the result from the first search for $D^0$ decays to invisible final states. The analysis is performed on a data sample of 924 $\rm{fb}^{-1}$ collected at and near the $\Upsilon(4S)$ and $\Upsilon(5S)$ resonances with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The absolute branching fraction is determined using an inclusive $D^0$ sample, obtained by fully reconstructing the rest of the particle system including the other charmed particle. No significant signal yield is observed and an upper limit of $9.4\times 10^{-5}$ is set on the branching fraction of $D^0$ to invisible final states at 90\% confidence level.

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Search for D⁰ decays to invisible final states at Belle

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