Branching ratio of the electromagnetic decay of the Σ +(1385)

D. Keller, K. Hicks, K. P. Adhikari, D. Adikaram, M. J. Amaryan, M. Anghinolfi, H. Baghdasaryan, J. Ball, M. Battaglieri, I. Bedlinskiy, A. S. Biselli, C. Bookwalter, S. Boiarinov, D. Branford, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, S. ChandavarP. L. Cole, M. Contalbrigo, V. Crede, A. D'Angelo, A. Daniel, N. Dashyan, R. De Vita, E. De Sanctis, C. Djalali, D. Doughty, R. Dupre, A. El Alaoui, L. El Fassi, L. Elouadrhiri, P. Eugenio, G. Fedotov, M. Y. Gabrielyan, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, W. Gohn, E. Golovatch, R. W. Gothe, L. Graham, K. A. Griffioen, M. Guidal, N. Guler, L. Guo, K. Hafidi, H. Hakobyan, M. Holtrop, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, H. S. Jo, K. Joo, M. Khandaker, P. Khetarpal, A. Kim, W. Kim, F. J. Klein, A. Kubarovsky, V. Kubarovsky, S. V. Kuleshov, H. Y. Lu, I. J D MacGregor, Y. Mao, N. Markov, M. Mayer, B. McKinnon, C. A. Meyer, T. Mineeva, M. Mirazita, V. Mokeev, H. Moutarde, E. Munevar, P. Nadel-Turonski, R. Nasseripour, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, M. Paolone, L. Pappalardo, R. Paremuzyan, K. Park, S. Park, E. Pasyuk, S. Anefalos Pereira, S. Pisano, O. Pogorelko, S. Pozdniakov, S. Procureur, Y. Prok, D. Protopopescu, B. A. Raue, G. Ricco, D. Rimal, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, R. A. Schumacher, H. Seraydaryan, Y. G. Sharabian, E. S. Smith, G. D. Smith, D. I. Sober, D. Sokhan, S. S. Stepanyan, S. Stepanyan, P. Stoler, S. Strauch, M. Taiuti, W. Tang, C. E. Taylor, S. Tkachenko, B. Vernarsky, M. F. Vineyard, A. V. Vlassov, H. Voskanyan, E. Voutier, D. P. Watts, M. H. Wood, N. Zachariou, L. Zana, B. Zhao, Z. W. Zhao

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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 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 languageEnglish (US)
Article number052004
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume85
Issue number5
DOIs
StatePublished - Mar 19 2012

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