Year: 2013
Type: article
Abstract: We report the first observation of the line shape of the $\ensuremath{\Lambda}(1405)$ from electroproduction, and show that it is not a simple Breit-Wigner resonance. Electroproduction of ${K}^{+}\ensuremath{\Lambda}(1405)$ off the proton was studied by using data from CLAS at Jefferson Lab in the range $1.0<{Q}^{2}<3.0$ (GeV/$c$)${}^{2}$. The analysis utilized the decay channels ${\ensuremath{\Sigma}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ of the $\ensuremath{\Lambda}(1405)$ and $p{\ensuremath{\pi}}^{0}$ of the ${\ensuremath{\Sigma}}^{+}$. 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 $\ensuremath{\Lambda}(1405)$, with a lower mass pole near 1368 MeV/${c}^{2}$ and a higher mass pole near 1423 MeV/${c}^{2}$. Furthermore, with increasing photon virtuality the mass distribution shifts toward the higher mass pole.
Source: Physical Review C
Authors: 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, Z. W. Zhao
Institutions: Carnegie Mellon University, Old Dominion University, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, CEA Paris-Saclay - Etablissement de Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, Istituto Nazionale di Fisica Nucleare, Sezione di Genova, Thomas Jefferson National Accelerator Facility, Institute for Theoretical and Experimental Physics, Fairfield University, George Washington University, Universidad Técnica Federico Santa María, Ohio University, Idaho State University, Catholic University of America, Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara, Florida State University, University of Rome Tor Vergata, Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata, A. Alikhanyan National Laboratory, University of South Carolina, Christopher Newport University, Institut de Physique Nucléaire d’Orsay, Argonne National Laboratory, Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, University of Edinburgh, Florida International University, University of Richmond, James Madison University, University of Connecticut, William & Mary, University of New Hampshire, University of Glasgow, University of Virginia, Norfolk State University, Kyungpook National University, Rensselaer Polytechnic Institute, Arizona State University, California State University, Dominguez Hills, University of Genoa, Centre National de la Recherche Scientifique, Université Joseph Fourier, Institut National de Physique Nucléaire et de Physique des Particules, Canisius College
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1702312347