The CLAS detector was used to obtain the first ever measurement of the electromagnetic decay of the Σ *+(1385) from the reaction γp→K0Σ *+(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 Σ * 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 Σ +(1385)→Σ +γ/Σ +(1385)→Σ +π0=11. 95±2.21(stat)-1.21+0.53(sys)% and a deduced partial width of 250.0±56.9(stat)-41.2+34.3(sys)keV. A U-spin symmetry test using the SU(3) flavor-multiplet representation yields predictions for the Σ *+(1385)→Σ +γ and Σ *0(1385)→Λγ partial widths that agree with the experimental measurements.
|Original language||English (US)|
|Journal||Physical Review D - Particles, Fields, Gravitation and Cosmology|
|State||Published - Mar 19 2012|