Branching ratio of the electromagnetic decay of the \u3a3^{+}(1385)

The CLAS detector was used to obtain the first ever measurement of the electromagnetic decay of the \u3a3*+(1385) from the reaction \u3b3p\u2192K0\u3a3*+(1385). A real photon beam with a maximum energy of 3.8 GeV was incident on a liquid-hydrogen target, resulting in the photoproduction of the kaon and \u3a3* hyperon. Kinematic fitting was used to separate the reaction channel from the background processes. The fitting algorithm exploited a new method to kinematically fit neutrons in the CLAS detector, leading to the measured decay widths ratio \u3a3+(1385)\u2192\u3a3+\u3b3/\u3a3+(1385)\u2192\u3a3+\u3c00=11.95\ub12.21(stat)-1.21+0.53(sys)% and a deduced partial width of 250.0\ub156.9(stat)-41.2+34.3(sys)\u2009\u2009keV. A U-spin symmetry test using the SU(3) flavor-multiplet representation yields predictions for the \u3a3*+(1385)\u2192\u3a3+\u3b3 and \u3a3*0(1385)\u2192\u39b\u3b3 partial widths that agree with the experimental measurements