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Jaegle, I; Adachi, I; Aihara, H; Al Said, S; Asner, D M; Aushev, T; Ayad, R; Bakich, A M; Barrett, M; Bhuyan, B; Bračko, M; Červenkov, D; Chobanova, V; Choi, S-K; Choi, Y; Doležal, Z; Dutta, D; Eidelman, S; Farhat, H; Fast, J E; Gaur, V; Gabyshev, N; Garmash, A; Gillard, R; Goh, Y M; Golob, B; Grzymkowska, O; Hayasaka, K; Hayashii, H; He, X H; Inami, K; Iwasaki, Y; Julius, T; Kang, K H; Kato, E; Kawasaki, T; Kim, D Y; Kim, J H; Kinoshita, K; Ko, B R; Kodyš, P; Korpar, S; Krokovny, P; Kuzmin, A; Kwon, Y-J; Lange, J S; Lee, I S; Lewis, P; Li Gioi, L; Libby, J; Liventsev, D; Matvienko, D; Miyata, H; Mizuk, R; Mohanty, G B; Nisar, N K; Nishida, S; Ogawa, S; Pakhlov, P; Pakhlova, G; Park, H; Pesántez, L; Petrič, M; Piilonen, L E; Ritter, M; Santelj, L; Sato, Y; Schneider, O; Schnell, G; Schwanda, C; Seong, I; Sevior, M E; Shibata, T-A; Shiu, J-G; Shwartz, B; Simon, F; Sohn, Y-S; Starič, M; Sumihama, M; Sumisawa, K; Tamponi, U; Teramoto, Y; Uchida, M; Uehara, S; Unno, Y; Uno, S; Vahsen, S E; Vanhoefer, P; Vinokurova, A; Wagner, M N; Wang, P; Wang, X L; Watanabe, Y; Williams, K M; Yamaoka, J; Yashchenko, S; Yook, Y; Yusa, Y; Zhulanov, V; Zupanc, A
Physical review letters, 05/2015, Letnik: 114, Številka: 21Journal Article
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 Higgstrahlung 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 inclusive 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% credibility 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}.
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