The CLAS detector was used to obtain the first ever measuremen t 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 ofthe 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 partial width measurement of 250.0±56.9(stat)+34.3−41.2(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.
Branching ratio of the electromagnetic decay of the Sigma(+)(1385)
CONTALBRIGO, Marco;PAPPALARDO, Luciano Libero;
2012
Abstract
The CLAS detector was used to obtain the first ever measuremen t 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 ofthe 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 partial width measurement of 250.0±56.9(stat)+34.3−41.2(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.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
