Branching ratio of the electromagnetic decay of the Σ +(1385)
Journal
Physical Review D - Particles, Fields, Gravitation and Cosmology
Date Issued
2012-03-19
Author(s)
Keller, D.
Hicks, K.
Adhikari, K. P.
Adikaram, D.
Amaryan, M. J.
Anghinolfi, M.
Baghdasaryan, H.
Ball, J.
Battaglieri, M.
Bedlinskiy, I.
Biselli, A. S.
Bookwalter, C.
Boiarinov, S.
Branford, D.
Briscoe, W. J.
Burkert, V. D.
Carman, D. S.
Celentano, A.
Chandavar, S.
Cole, P. L.
Contalbrigo, M.
Crede, V.
D'Angelo, A.
Daniel, A.
Dashyan, N.
De Vita, R.
De Sanctis, E.
Djalali, C.
Doughty, D.
Dupre, R.
El Alaoui, A.
El Fassi, L.
Elouadrhiri, L.
Eugenio, P.
Fedotov, G.
Gabrielyan, M. Y.
Gevorgyan, N.
Gilfoyle, G. P.
Giovanetti, K. L.
Gohn, W.
Golovatch, E.
Gothe, R. W.
Graham, L.
Griffioen, K. A.
Guidal, M.
Guler, N.
Guo, L.
Hafidi, K.
Holtrop, M.
Ilieva, Y.
Ireland, D. G.
Ishkhanov, B. S.
Isupov, E. L.
Jo, H. S.
Joo, K.
Khandaker, M.
Khetarpal, P.
Kim, A.
Kim, W.
Klein, F. J.
Kubarovsky, A.
Kubarovsky, V.
Lu, H. Y.
MacGregor, I. J.D.
Mao, Y.
Markov, N.
Mayer, M.
McKinnon, B.
Meyer, C. A.
Mineeva, T.
Mirazita, M.
Mokeev, V.
Moutarde, H.
Munevar, E.
Nadel-Turonski, P.
Nasseripour, R.
Niccolai, S.
Niculescu, G.
Niculescu, I.
Osipenko, M.
Ostrovidov, A. I.
Paolone, M.
Pappalardo, L.
Paremuzyan, R.
Park, K.
Park, S.
Pasyuk, E.
Anefalos Pereira, S.
Pisano, S.
Pogorelko, O.
Pozdniakov, S.
Procureur, S.
Prok, Y.
Protopopescu, D.
Raue, B. A.
Ricco, G.
Rimal, D.
DOI
10.1103/PhysRevD.85.052004
Abstract
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: Γ(Σ⁺(1385) → Σ⁺γ) / Γ(Σ⁺(1385) → Σ⁺π⁰) = 11.95 ± 2.21 (stat) ⁺⁰.⁵³₋₁.₂₁ (sys) % and a deduced partial width of: Γ(Σ⁺(1385) → Σ⁺γ) = 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.
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