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dc.contributor.author천병구-
dc.date.accessioned2016-11-17T06:48:33Z-
dc.date.available2016-11-17T06:48:33Z-
dc.date.issued2015-05-
dc.identifier.citationPHYSICAL REVIEW LETTERS, v. 114, NO 21, Page. 211801-211801en_US
dc.identifier.issn0031-9007-
dc.identifier.issn1079-7114-
dc.identifier.urihttp://journals.aps.org/prl/abstract/10.1103/PhysRevLett.114.211801-
dc.identifier.urihttp://hdl.handle.net/20.500.11754/24447-
dc.description.abstractThe 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#.en_US
dc.description.sponsorshipWe thank the KEKB group for excellent operation of the accelerator, the KEK cryogenics group for efficient solenoid operations, and the KEK computer group, the NII, and PNNL/EMSL for valuable computing and SINET4 network support. We acknowledge support from MEXT, JSPS, and Nagoya's TLPRC (Japan), ARC (Australia), FWF (Austria), NSFC (China), MSMT (Czechia), CZF, DFG, and VS (Germany), DST (India), INFN (Italy), MOE, MSIP, NRF, GSDC of KISTI, and BK21Plus (Korea), MNiSW and NCN (Poland), MES and RFAAE (Russia), ARRS (Slovenia), IKERBASQUE and UPV/EHU (Spain), SNSF (Switzerland), NSC and MOE (Taiwan), and U.S. DOE and U.S. NSF (USA). We would also like to thank Bertrand Echenard for discussing the BABAR analysis and Rouven Essig for providing the models for MADGRAPH.en_US
dc.language.isoenen_US
dc.publisherAMER PHYSICAL SOCen_US
dc.subjectBEAM-DUMP EXPERIMENTen_US
dc.subjectEXCLUSION LIMITSen_US
dc.subjectGAUGE FORCESen_US
dc.subjectPARTICLESen_US
dc.subjectMATTERen_US
dc.subjectANNIHILATIONen_US
dc.subjectDETECTORen_US
dc.subjectENERGYen_US
dc.subjectMASSen_US
dc.subjectPAIRen_US
dc.titleSearch for the Dark Photon and the Dark Higgs Boson at Belleen_US
dc.typeArticleen_US
dc.relation.no21-
dc.relation.volume114-
dc.identifier.doi10.1103/PhysRevLett.114.211801-
dc.relation.page211801-211801-
dc.relation.journalPHYSICAL REVIEW LETTERS-
dc.contributor.googleauthorJaegle, I.-
dc.contributor.googleauthorAdachi, I.-
dc.contributor.googleauthorAihara, H.-
dc.contributor.googleauthorAl Said, S.-
dc.contributor.googleauthorAsner, D. M.-
dc.contributor.googleauthorAushev, T.-
dc.contributor.googleauthorAyad, R.-
dc.contributor.googleauthorBakich, A. M.-
dc.contributor.googleauthorBansal, V.-
dc.contributor.googleauthorBarrett, M.-
dc.contributor.googleauthorCheon, B. G.-
dc.relation.code2015001420-
dc.sector.campusS-
dc.sector.daehakCOLLEGE OF NATURAL SCIENCES[S]-
dc.sector.departmentDEPARTMENT OF PHYSICS-
dc.identifier.pidbgcheon-
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COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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