Measurement of the Σπ photoproduction line shapes near the Λ(1405)

K. Moriya, R. A. Schumacher, K. P. Adhikari, D. Adikaram, M. Aghasyan, M. D. Anderson, S. Anefalos Pereira, J. Ball, N. A. Baltzell, M. Battaglieri, V. Batourine, I. Bedlinskiy, M. Bellis, A. S. Biselli, J. Bono, S. Boiarinov, W. J. Briscoe, V. D. Burkert, D. S. Carman, A. CelentanoS. Chandavar, G. Charles, P. L. Cole, P. Collins, V. Crede, A. D'Angelo, N. Dashyan, E. De Sanctis, R. De Vita, A. Deur, B. Dey, C. Djalali, D. Doughty, R. Dupre, H. Egiyan, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, R. Fersch, J. A. Fleming, N. Gevorgyan, G. P. Gilfoyle, K. L. Giovanetti, F. X. Girod, J. T. Goetz, W. Gohn, E. Golovatch, R. W. Gothe, K. A. Griffioen, M. Guidal, K. Hafidi, H. Hakobyan, C. Hanretty, N. Harrison, D. Heddle, K. Hicks, D. Ho, M. Holtrop, C. E. Hyde, Y. Ilieva, D. G. Ireland, B. S. Ishkhanov, E. L. Isupov, H. S. Jo, D. Keller, M. Khandaker, P. Khetarpal, A. Kim, W. Kim, A. Klein, F. J. Klein, S. Koirala, A. Kubarovsky, V. Kubarovsky, S. V. Kuleshov, N. D. Kvaltine, K. Livingston, H. Y. Lu, I. J.D. MacGregor, N. Markov, M. Mayer, M. McCracken, B. McKinnon, M. D. Mestayer, C. A. Meyer, M. Mirazita, T. Mineeva, V. Mokeev, R. A. Montgomery, E. Munevar, C. Munoz Camacho, P. Nadel-Turonski, R. Nasseripour, C. S. Nepali, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, L. L. Pappalardo, R. Paremuzyan, K. Park, S. Park, E. Pasyuk, E. Phelps, J. J. Phillips, S. Pisano, N. Pivnyuk, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, D. Protopopescu, D. Rimal, M. Ripani, B. G. Ritchie, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, E. Seder, H. Seraydaryan, Y. G. Sharabian, E. S. Smith, G. D. Smith, D. I. Sober, S. S. Stepanyan, S. Stepanyan, P. Stoler, I. I. Strakovsky, S. Strauch, M. Taiuti, W. Tang, S. Taylor, C. E. Taylor, Ye Tian, S. Tkachenko, B. Torayev, M. Ungaro, B. Vernarsky, A. V. Vlassov, H. Voskanyan, E. Voutier, N. K. Walford, D. P. Watts, D. P. Weygand, M. Williams, N. Zachariou, L. Zana, J. Zhang, Z. W. Zhao, I. Zonta

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135 Scopus citations


The reaction γ+p→K++Σ+π was used to determine the invariant mass distributions or "line shapes" of the Σ+π-, Σ-π+, and Σ0π0 final states, from threshold at 1328 MeV/c2 through the mass range of the Λ(1405) and the Λ(1520). The measurements were made with the CLAS system at Jefferson Lab using tagged real photons, for center-of-mass energies 1.95<W<2.85 GeV. The three mass distributions differ strongly in the vicinity of the I=0 Λ(1405), indicating the presence of substantial I=1 strength in the reaction. Background contributions to the data from the Σ0(1385) and from K*Σ production were studied and shown to have negligible influence. To separate the isospin amplitudes, Breit-Wigner model fits were made that included channel-coupling distortions due to the NK̄ threshold. A best fit to all the data was obtained after including a phenomenological I=1, JP=1/2- amplitude with a centroid at 1394±20 MeV/c2 and a second I=1 amplitude at 1413±10 MeV/c2. The centroid of the I=0 Λ(1405) strength was found at the Σπ threshold, with the observed shape determined largely by channel coupling, leading to an apparent overall peak near 1405 MeV/c2.

Original languageEnglish (US)
Article number035206
JournalPhysical Review C - Nuclear Physics
Issue number3
StatePublished - Mar 15 2013
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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