Journal
PHYSICAL REVIEW LETTERS
Volume 114, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.114.211801
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Funding
- MEXT (Japan)
- JSPS (Japan)
- Nagoya's TLPRC (Japan)
- ARC (Australia)
- FWF (Austria)
- NSFC (China)
- MSMT (Czechia)
- CZF (Germany)
- DFG (Germany)
- VS (Germany)
- DST (India)
- INFN (Italy)
- MOE (Korea)
- MSIP (Korea)
- NRF (Korea)
- GSDC of KISTI (Korea)
- BK21Plus (Korea)
- MNiSW (Poland)
- NCN (Poland)
- MES (Russia)
- RFAAE (Russia)
- ARRS (Slovenia)
- IKERBASQUE (Spain)
- UPV/EHU (Spain)
- SNSF (Switzerland)
- NSC (Taiwan)
- MOE (Taiwan)
- U.S. DOE (USA)
- U.S. NSF (USA)
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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).
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