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arxiv: 1605.04430 · v1 · submitted 2016-05-14 · ✦ hep-ex

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Search for a massive invisible particle X⁰ in B⁺to e⁺X⁰ and B⁺to μ⁺X⁰ decays

C.-S. Park , Y.-J. Kwon , I. Adachi , H. Aihara , D. M. Asner , T. Aushev , V. Babu , I. Badhrees
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A. M. Bakich E. Barberio P. Behera V. Bhardwaj J. Biswal G. Bonvicini A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno M. Danilov N. Dash Z. Dole\v{z}al D. Dutta S. Eidelman H. Farhat J. E. Fast T. Ferber B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard Y. M. Goh P. Goldenzweig O. Grzymkowska T. Hara K. Hayasaka H. Hayashii M. Heck W.-S. Hou T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki I. Jaegle H. B. Jeon T. Julius K. H. Kang E. Kato P. Katrenko D. Y. Kim J. B. Kim K. T. Kim M. J. Kim S. H. Kim K. Kinoshita P. Kodys S. Korpar P. Kri\v{z}an P. Krokovny A. Kuzmin I. S. Lee C. H. Li L. Li Y. Li L. Li Gioi J. Libby D. Liventsev M. Lubej P. Lukin M. Masuda D. Matvienko K. Miyabayashi H. Miyata R. Mizuk G. B. Mohanty S. Mohanty A. Moll H. K. Moon R. Mussa E. Nakano M. Nakao K. J. Nath M. Nayak K. Negishi N. K. Nisar S. Nishida S. Ogawa S. Okuno P. Pakhlov G. Pakhlova B. Pal C. W. Park H. Park T. K. Pedlar M. Petri\v{c} L. E. Piilonen C. Pulvermacher M. V. Purohit J. Rauch M. Ritter A. Rostomyan S. Ryu Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato T. Schl\"uter O. Schneider G. Schnell C. Schwanda A. J. Schwartz Y. Seino D. Semmler K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu B. Shwartz F. Simon A. Sokolov S. Stani\v{c} M. Stari\v{c} J. Stypula T. Sumiyoshi U. Tamponi Y. Teramoto K. Trabelsi M. Uchida T. Uglov Y. Unno S. Uno P. Urquijo Y. Usov C. Van Hulse P. Vanhoefer G. Varner K. E. Varvell M. N. Wagner C. H. Wang M.-Z. Wang P. Wang Y. Watanabe E. Won J. Yamaoka S. Yashchenko H. Ye Y. Yook Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc (The Belle Collaboration)
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classification ✦ hep-ex
keywords decaysinvisiblemesonparticlesearchsignalbellecollected
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We present a search for a non-Standard-Model invisible particle $X^0$ in the mass range $0.1\textrm{-}1.8 \,{\rm GeV}/{c^2}$ in $B^{+}\to e^{+} X^{0}$ and $B^{+}\to \mu^{+} X^{0}$ decays. The results are obtained from a $711~{\rm fb}^{-1}$ data sample that corresponds to $772 \times 10^{6} B\bar{B}$ pairs, collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider. One $B$ meson is fully reconstructed in a hadronic mode to determine the momentum of the lepton of the signal decay in the rest frame of the recoiling partner $B$ meson. We find no evidence of a signal and set upper limits on the order of $10^{-6}$.

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