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)

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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 Douglas 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