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First observation of the Λ(1405) line shape in electroproduction

By H. Y. Lu, R. A. Schumacher, K. P. Adhikari, D. Adikaram, M. Aghasyan, M. J. Amaryan, S. Anefalos Pereira, J. Ball, M. Battaglieri, V. Batourine, I. Bedlinskiy, A. S. Biselli, S. Boiarinov, W. J. Briscoe, W. K. Brooks, V. D. Burkert, D. S. Carman, A. Celentano, S. Chandavar, P. L. Cole, P. Collins, M. Contalbrigo, O. Cortes, V. Crede, A. D’Angelo, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, C. Djalali, D. Doughty, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, P. Eugenio, G. Fedotov, S. Fegan, J. A. Fleming, M. Gabrielyan, 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, L. Guo, K. Hafidi, H. Hakobyan, 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, K. Joo, D. Keller, M. Khandaker, W. Kim, A. Klein, F. J. Klein, S. Koirala, A. Kubarovsky, V. Kubarovsky, S. V. Kuleshov, S. Lewis, K. Livingston, I. J. D. MacGregor, D. Martinez, M. Mayer, B. McKinnon, C. A. Meyer, T. Mineeva, M. Mirazita, V. Mokeev, R. A. Montgomery, K. Moriya, H. Moutarde, E. Munevar, C. Munoz Camacho, P. Nadel-Turonski, 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, P. Peng, E. Phelps, J. J. Phillips, S. Pisano, O. Pogorelko, S. Pozdniakov, J. W. Price, S. Procureur, Y. Prok, D. Protopopescu, A. J. R. Puckett, B. A. Raue, D. Rimal, M. Ripani, G. Rosner, P. Rossi, F. Sabatié, M. S. Saini, C. Salgado, D. Schott, E. Seder, H. Seraydaryan, Y. G. Sharabian, G. D. Smith, D. I. Sober, D. Sokhan, S. S. Stepanyan, P. Stoler, S. Strauch, M. Taiuti, W. Tang, Ye Tian, S. Tkachenko, B. Torayev, B. Vernarsky, H. Voskanyan, E. Voutier, N. K. Walford, D. P. Weygand, M. H. Wood, N. Zachariou, L. Zana, J. Zhang and Z. W. Zhao


We report the first observation of the line shape of the (1405) from electroproduction, and show that it is not a simple Breit-Wigner resonance. Electroproduction of K+ (1405) off the proton was studied by using data from CLAS at Jefferson Lab in the range 1.0 < Q2 < 3.0 (GeV/c)2. The analysis utilized the decay channels +π− of the (1405) and pπ0 of the +. Neither the standard Particle Data Group resonance parameters, nor free parameters fitting to a single Breit-Wigner resonance represent the line shape. In our fits, the line shape corresponds approximately to predictions of a two-pole meson-baryon picture of the (1405), with a lower mass pole near 1368 MeV/c2 and a higher mass pole near 1423 MeV/c2. Furthermore, with increasing photon virtuality the mass distribution shifts toward the higher mass pole

Year: 2013
DOI identifier: 10.1103/PhysRevC.88.045202
OAI identifier: oai:iris.unife.it:11392/2018016
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