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, M. Bračko, T. E. Browder, D. Červenkov, M. C. Chang, B. G. Cheon, K. Chilikin, K. Cho, V. ChobanovaS. 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

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38 Citations (Scopus)

Abstract

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 0.1GeV/c2<mA′<3.5GeV/c2 and 0.2GeV/c2<mh′<10.5GeV/c2. 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 1.1GeV/c2<mA′<3.5GeV/c2 and 2.2GeV/c2<mh′<10.5GeV/c2. Using the entire 977fb-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×σBorn, on the Born cross section σBorn, and on the dark photon coupling to the dark Higgs boson times the kinetic mixing between the standard model photon and the dark photon, αD×ε2. 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 αD equal to 1/137, mh′<8GeV/c2, and mA′<1GeV/c2, we exclude values of the mixing parameter ε above ∼8×10-4.

Original languageEnglish
Article number211801
JournalPhysical review letters
Volume114
Issue number21
DOIs
Publication statusPublished - 2015 May 27

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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