Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8187819 | Physics Letters B | 2013 | 7 Pages |
Abstract
The presently world largest data sample for Ï0âγe+eâ decays studies containing nearly 5Ã105 events was collected using the WASA detector at COSY. A search for a dark photon U produced in the Ï0âγUâγe+eâ decay from the ppâppÏ0 reaction was carried out. An upper limit on the square of the Uâγ mixing strength parameter ϵ2 of 5Ã10â6 at 90% CL was obtained for the mass range 20 MeV
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