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arXiv · 2004.03826

Search for $B^0$ Decays to Invisible Final States ($+\gamma$) at Belle

Belle Collaboration·Y. Ku·P. Chang·I. Adachi·K. Adamczyk·H. Aihara·D. M. Asner·T. Aushev·R. Ayad·P. Behera·C. Bele\ {n}o·J. Bennett·V. Bhardwaj·T. Bilka·J. Biswal·G. Bonvicini·A. Bozek·M. Bračko·M. -C. Chang·V. Chekelian·K. Chilikin·K. Cho·S. -K. Choi·Y. Choi·D. Cinabro·S. Cunliffe·N. Dash·G. De Nardo·T. V. Dong·S. Eidelman·D. Epifanov·J. E. Fast·B. G. Fulsom·R. Garg·V. Gaur·N. Gabyshev·A. Garmash·P. Goldenzweig·O. Grzymkowska·Y. Guan·O. Hartbrich·K. Hayasaka·H. Hayashii·M. Hernandez Villanueva·T. Higuchi·W. -S. Hou·C. -L. Hsu·K. Huang·K. Inami·G. Inguglia·A. Ishikawa·R. Itoh·M. Iwasaki·Y. Iwasaki·S. Jia·Y. Jin·K. H. Kang·T. Kawasaki·H. Kichimi·C. Kiesling·C. H. Kim·D. Y. Kim·T. D. Kimmel·K. Kinoshita·P. Kodyš·S. Korpar·P. Križan·R. Kroeger·P. Krokovny·T. Kuhr·R. Kulasiri·R. Kumar·Y. -J. Kwon·Y. -T. Lai·Y. B. Li·L. Li Gioi·J. Libby·K. Lieret·C. MacQueen·D. Matvienko·M. Merola·R. Mizuk·G. B. Mohanty·T. J. Moon·T. Mori·R. Mussa·Z. Natkaniec·M. Nayak·N. K. Nisar·S. Nishida·K. Nishimura·K. Ogawa·S. Ogawa·H. Ono·P. Oskin·P. Pakhlov·G. Pakhlova·H. Park·S. -H. Park·S. Patra
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Abstract

We report searches for $B^0\to\rm{invisible}$ and $B^0\to\rm{invisible}+\gamma$ decays, where the energy of the photon is required to be larger than 0.5 GeV. These results are obtained from a $711\,{\rm fb}^{-1}$ data sample that contains $772 \times 10^6 B\bar{B}$ pairs and was collected near the $\Upsilon\,(4S)$ resonance with the Belle detector at the KEKB $e^+ e^-$ collider. We observe no significant signal for either decay and set upper limits on their branching fractions at $90\%$ confidence level of $\mathcal{B}\,(B^0\to\rm{invisible}) < 7.8\times10^{-5}$ and $\mathcal{B}\,(B^0\to\rm{invisible}+\gamma) < 1.6\times10^{-5}$.

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Belle Collaboration, Y. Ku, P. Chang, I. Adachi, K. Adamczyk, H. Aihara, D. M. Asner, T. Aushev, R. Ayad, P. Behera, C. Bele\ {n}o, J. Bennett, V. Bhardwaj, T. Bilka, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, M. -C. Chang, V. Chekelian, K. Chilikin, K. Cho, S. -K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, T. V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, O. Grzymkowska, Y. Guan, O. Hartbrich, K. Hayasaka, H. Hayashii, M. Hernandez Villanueva, T. Higuchi, W. -S. Hou, C. -L. Hsu, K. Huang, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, S. Jia, Y. Jin, K. H. Kang, T. Kawasaki, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, T. D. Kimmel, K. Kinoshita, P. Kodyš, S. Korpar, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, Y. -J. Kwon, Y. -T. Lai, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, C. MacQueen, D. Matvienko, M. Merola, R. Mizuk, G. B. Mohanty, T. J. Moon, T. Mori, R. Mussa, Z. Natkaniec, M. Nayak, N. K. Nisar, S. Nishida, K. Nishimura, K. Ogawa, S. Ogawa, H. Ono, P. Oskin, P. Pakhlov, G. Pakhlova, H. Park, S. -H. Park, S. Patra. 2020-04-08. Search for $B^0$ Decays to Invisible Final States ($+\gamma$) at Belle. https://doi.org/10.1103/physrevd.102.012003

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