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

Lu, H.Y. et al. (2013) First observation of the Λ(1405) line shape in electroproduction. Physical Review C, 88(4), 045202-1-045202-7. (doi:10.1103/PhysRevC.88.045202)

Lu, H.Y. et al. (2013) First observation of the Λ(1405) line shape in electroproduction. Physical Review C, 88(4), 045202-1-045202-7. (doi:10.1103/PhysRevC.88.045202)

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Abstract

We report the first observation of the line shape of the Λ(1405) from electroproduction, and show that it is not a simple Breit-Wigner resonance. Electroproduction of K+Λ(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 Σ+π− of the Λ(1405) and pπ0 of the Σ+. 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 Λ(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.

Item Type:Articles (Other)
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sokhan, Dr Daria and McKinnon, Dr Bryan and Ireland, Professor David and Livingston, Dr Kenneth and Smith, Mr Gordon and MacGregor, Professor I and Lewis, Dr Stefanie and Montgomery, Dr Rachel and Rosner, Professor Guenther and Protopopescu, Dr Dan
Authors: Lu, H.Y., Schumacher, R. A., Adhikari, K. P., Adikaram, D., Aghasyan, M., Amaryan, M. J., Pereira, S.A., Ball, J., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A. S., Boiarinov, S., Briscoe, W.J., Brooks, W.K., Burkert, V.D., Carman, D.S., Celentano, A., Chandavar, S., Cole, P.L., Collins, P., Contalbrigo, M., Cortes, O., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Deur, A., Djalali, C., Doughty, D., Dupre, R., Egiyan, H., Alaoui, A.E., Fassi, L.E., Eugenio, P., Fedotov, G., Fegan, S., Fleming, J.A., Gabrielyan, M., Gevorgyan, N., Gilfoyle, G.P., Giovanetti, K.L., Girod, F. X., Goetz, J.T., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Guidal, M., Guo, L., Hafidi, K., Hakobyan, H., Harrison, N., Heddle, D., Hicks, K., Ho, D., Holtrop, M., Hyde, C.E., Ilieva, Y., Ireland, D.G., Ishkhanov, B.S., Isupov, E.L., Jo, H.S., Joo, K., Keller, D., Khandaker, M., Kim, W., Klein, A., Klein, F.J., Koirala, S., Kubarovsky, A., Kubarovsky, V., Kuleshov, S.V., Lewis, S., Livingston, K., MacGregor, I.J.D., Martinez, D., Mayer, M., McKinnon, B., Meyer, C.A., Mineeva, T., Mirazita, M., Mokeev, V., Montgomery, R., Moriya, K., Moutarde, H., Munevar, E., Camacho, C.M., Nadel-Turonski, P., Nepali, C.S., Niccolai, S., Niculescu, G., Niculescu, I., Osipenko, M., Ostrovidov, A.I., Pappalardo, L.L., Paremuzyan, R., Park, K., Park, S., Pasyuk, E., Peng, P., Phelps, E., Phillips, J.J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J.W., Procureur, S., Prok, Y., Protopopescu, D., Puckett, A.J.R., Raue, B.A., Rimal, D., Ripani, M., Rosner, G., Rossi, P., Sabatié, F., Saini, M.S., Salgado, C., Schott, D., Seder, E., Seraydaryan, H., Sharabian, Y.G., Smith, G.D., Sober, D.I., Sokhan, D., Stepanyan, S.S., Stoler, P., Strauch, S., Taiuti, M., Tang, W., Tian, Y., Tkachenko, S., Torayev, B., Vernarsky, B., Voskanyan, H., Voutier, E., Walford, N.K., Weygand, D.P., Wood, M.H., Zachariou, N., Zana, L., Zhang, J., and Zhao, Z.W.
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Group:PPE
Journal Name:Physical Review C
ISSN:0556-2813
ISSN (Online):1089-490X

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
570711Nuclear Physics GroupDavid IrelandScience & Technologies Facilities Council (STFC)ST/J000175/1P&A - PHYSICS & ASTRONOMY