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arXiv · 1605.04430

Search for a massive invisible particle $X^0$ in $B^{+}\to e^{+}X^{0}$ and $B^{+}\to \mu^{+}X^{0}$ decays

C. -S. Park·Y. -J. Kwon·I. Adachi·H. Aihara·D. M. Asner·T. Aushev·V. Babu·I. Badhrees·A. M. Bakich·E. Barberio·P. Behera·V. Bhardwaj·J. Biswal·G. Bonvicini·A. Bozek·M. Bračko·T. E. Browder·D. Červenkov·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. Doležal·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. Križan·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
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Abstract

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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C. -S. Park, Y. -J. Kwon, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, V. Babu, I. Badhrees, A. M. Bakich, E. Barberio, P. Behera, V. Bhardwaj, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, 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. Doležal, 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. Križan, 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. 2016-05-14. Search for a massive invisible particle $X^0$ in $B^{+}\to e^{+}X^{0}$ and $B^{+}\to \mu^{+}X^{0}$ decays. https://doi.org/10.1134/s1063778817050209

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