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Search for the Dark Photon and the Dark Higgs Boson at Belle

I. Jaegle, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, A. M. Bakich, V. Bansal, M. Barrett, B. Bhuyan, A. Bozek (+135 others)
2015 Physical Review Letters  

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https://web.archive.org/web/20180720010909/https://link.aps.org/accepted/10.1103/PhysRevLett.114.211801

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2015 accepted
arXiv:1502.00084v2 fatcat:pp4h7sg4wfbsle5h4gomq2oowm
2015 pre-print
arXiv:1502.00084v1 fatcat:egukup57hvgthbd3zz3ifrcwqe
The dark photon, A^', and the dark Higgs boson, h^', are hypothetical constituents featured in a number of recently proposed Dark Sector Models. Assuming prompt decays of both dark particles, we search for their production in the so-called Higgs-strahlung channel, e^+e^- → A^' h', with h^'→ A^' A^'. We investigate ten exclusive final-states with A^'→ e^+e^-, μ^+μ^-, or π^+π^-, in the mass ranges 0.1 GeV/c^2 < m_A^' < 3.5 GeV/c^2 and 0.2 GeV/c^2 < m_h' < 10.5 GeV/c^2. We also investigate three
more » ... clusive final-states, 2(e^+e^-)X, 2(μ^+μ^-)X, and (e^+e^-)(μ^+μ^-)X, where X denotes a dark photon candidate detected via missing mass, in the mass ranges 1.1 GeV/c^2 < m_A^' < 3.5 GeV/c^2 and 2.2 GeV/c^2 < m_h' < 10.5 GeV/c^2. Using the entire 977 fb^-1 data set collected by Belle, we observe no significant signal. We obtain individual and combined 90% confidence level upper limits on the branching fraction times the Born cross section, B ×σ_Born, on the Born cross section, σ_Born, and on the dark photon coupling to the dark Higgs boson times the kinetic mixing between the Standard Model photon and the dark photon, α_D ×ϵ^2. These limits improve upon and cover wider mass ranges than previous experiments. The limits from the final-states 3(π^+π^-) and 2(e^+e^-)X are the first placed by any experiment. For α_D equal to 1/137, m_h'< 8 GeV/c^2, and m_A^'< 1 GeV/c^2, we exclude values of the mixing parameter, ϵ, above ∼ 8 × 10^-4.
doi:10.1103/physrevlett.114.211801 pmid:26066427 fatcat:kceioo46zrc3vkwur4af34aeyu
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Citation

I. Jaegle, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, T. Aushev, R. Ayad, A. M. Bakich, V. Bansal, M. Barrett, B. Bhuyan, A. Bozek, M. Bračko, T. E. Browder, D. Červenkov, M.-C. Chang, B. G. Cheon, K. Chilikin, K. Cho, V. Chobanova, S.-K. Choi, Y. Choi, D. Cinabro, J. Dalseno, Z. Doležal, Z. Drásal, A. Drutskoy, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, O. Frost, V. Gaur, N. Gabyshev, S. Ganguly, A. Garmash, D. Getzkow, R. Gillard, Y. M. Goh, B. Golob, O. Grzymkowska, K. Hayasaka, H. Hayashii, X. H. He, M. Hedges, W.-S. Hou, T. Iijima, K. Inami, A. Ishikawa, Y. Iwasaki, T. Julius, K. H. Kang, E. Kato, T. Kawasaki, D. Y. Kim, J. B. Kim, J. H. Kim, S. H. Kim, K. Kinoshita, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, A. Kuzmin, Y.-J. Kwon, J. S. Lange, I. S. Lee, P. Lewis, L. Li Gioi, J. Libby, D. Liventsev, D. Matvienko, H. Miyata, R. Mizuk, G. B. Mohanty, A. Moll, R. Mussa, E. Nakano, M. Nakao, N. K. Nisar, S. Nishida, S. Ogawa, P. Pakhlov, G. Pakhlova, H. Park, T. K. Pedlar, L. Pesántez, M. Petrič, L. E. Piilonen, M. Ritter, A. Rostomyan, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, D. Semmler, K. Senyo, O. Seon, I. Seong, M. E. Sevior, V. Shebalin, T.-A. Shibata, J.-G. Shiu, B. Shwartz, F. Simon, R. Sinha, Y.-S. Sohn, M. Starič, M. Sumihama, K. Sumisawa, U. Tamponi, G. Tatishvili, Y. Teramoto, F. Thorne, M. Uchida, S. Uehara, Y. Unno, S. Uno, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, A. Vinokurova, M. N. Wagner, C. H. Wang, M.-Z. Wang, P. Wang, X. L. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, J. Yamaoka, S. Yashchenko, Y. Yook, Y. Yusa, V. Zhilich, V. Zhulanov, A. Zupanc. "Search for the Dark Photon and the Dark Higgs Boson at Belle." Physical Review Letters 114.21 (2015)