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Search for the Dark Photon and the Dark Higgs Boson at Belle
Belle Collaboration
2015
发表期刊PHYSICAL REVIEW LETTERS
卷号114页码:211801
文章类型Article
摘要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(-), mu(+)mu(-), or pi(+)pi(-) 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(mu(+)mu(-))X, and (e(+)e(-))(mu(+)mu(-))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 x sigma(Born), on the Born cross section sigma(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, alpha(D) x epsilon(2). These limits improve upon and cover wider mass ranges than previous experiments. The limits from the final states 3(pi(+)pi(-)) and 2(e(+)e(-))X are the first placed by any experiment. For alpha(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 epsilon above similar to 8 x 10(-4).
学科领域Physics
DOI10.1103/PhysRevLett.114.211801
收录类别SCI ; EI
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000355101300008
引用统计
被引频次:26[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228484
专题实验物理中心
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Belle Collaboration. Search for the Dark Photon and the Dark Higgs Boson at Belle[J]. PHYSICAL REVIEW LETTERS,2015,114:211801.
APA Belle Collaboration.(2015).Search for the Dark Photon and the Dark Higgs Boson at Belle.PHYSICAL REVIEW LETTERS,114,211801.
MLA Belle Collaboration."Search for the Dark Photon and the Dark Higgs Boson at Belle".PHYSICAL REVIEW LETTERS 114(2015):211801.
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