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| Journal Article | FZJ-2013-05103 |
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2013
North-Holland Publ.
Amsterdam
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Please use a persistent id in citations: http://hdl.handle.net/2128/13265 doi:10.1016/j.physletb.2013.08.055
Abstract: The presently world largest data sample of pi0 --> gamma e+e- decays containing nearly 5E5 events was collected using the WASA detector at COSY. A search for a dark photon U produced in the pi0 --> gamma U --> gamma e+e- decay from the pp-->pp\pi^0 reaction was carried out. An upper limit on the square of the U-gamma mixing strength parameter epsilon^2 of 5e-6 at 90% CL was obtained for the mass range 20 MeV <M_U< 100 MeV. This result together with other recent experimental limits significantly reduces the M_U vs. \epsilon^2 parameter space preferred by the measured value of the muon anomalous magnetic moment.
Keyword(s): p p: interaction ; muon: magnetic moment ; photon: mixing ; pi0: radiative decay ; Juelich COSY PS ; U boson: search for ; electron positron: mass spectrum ; pi0: branching ratio: upper limit ; experimental results ; WASA ; p p --> 2p pi0 ; pi0 --> positron electron photon ; pi0 --> U boson photon ; 0.55 GeV-kin
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