Spin and parity measurement of the Λ(1405) baryon

Moriya, K. et al. (2014) Spin and parity measurement of the Λ(1405) baryon. Physical Review Letters, 112(8), 082004. (doi: 10.1103/PhysRevLett.112.082004)

Abstract

A determination of the spin and parity of the Λ(1405) is presented using photoproduction data from the CLAS detector at Jefferson Lab. The reaction γ+p→K++Λ(1405) is analyzed in the decay channel Λ(1405)→Σ++π−, where the decay distribution to Σ+π− and the variation of the Σ+ polarization with respect to the Λ(1405) polarization direction determines the parity. The Λ(1405) is produced, in the energy range 2.55<W<2.85  GeV and for 0.6<cosθc.m.K+<0.9, with polarization P=0.45±0.02(stat)±0.07(syst). The analysis shows that the decays are in Swave, with the Σ+ polarized such that the Λ(1405) has spin-parity JP=12−, as expected by most theories.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Sokhan, Dr Daria and MacGregor, Professor Douglas and McKinnon, Dr Bryan and Anderson, Mr Mark and Ireland, Professor David and Rosner, Professor Guenther
• Authors: Moriya, K., Schumacher, R. A., Aghasyan, M., Amaryan, M. J., Anderson, M. D., Anefalos Pereira, S., Ball, J., Baltzell, N. A., Battaglieri, M., Bellis, M., Biselli, A. S., Bono, J., Boiarinov, S., Briscoe, W. J., Brooks, W. K., Burkert, V. D., Carman, D. S., Celentano, A., Chandavar, S., Charles, G., Cole, P. L., Collins, P., Contalbrigo, M., Cortes, O., Crede, V., D’Angelo, A., Dashyan, N., De Vita, R., De Sanctis, E., Dey, B., Djalali, C., Dugger, M., Dupré, R., Egiyan, H., El Alaoui, A., El Fassi, L., Elouadrhiri, L., Eugenio, P., Fedotov, G., Fegan, S., Fleming, J. A., Gilfoyle, G. P., Giovanetti, K. L., Girod, F. X., Gohn, W., Golovatch, E., Gothe, R. W., Guidal, M., Griffioen, K. A., Hafidi, K., Hakobyan, H., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Ishkhanov, B. S., Isupov, E. L., Jo, H. S., Joo, K., Keller, D., Khandaker, M., Kim, W., Koirala, S., Kubarovsky, V., Kuleshov, S. V., Lenisa, P., Lu, H. Y., MacGregor, I. J. D., Markov, N., McCracken, M., McKinnon, B., Mestayer, M. D., Meyer, C. A., Mirazita, M., Mokeev, V., Montgomery, R. A., Moutarde, H., Munevar, E., Nadel-Turonski, P., Niccolai, S., Niculescu, I., Osipenko, M., Pappalardo, L. L., Pasyuk, E., Peng, P., Phillips, J. J., Pisano, S., Pogorelko, O., Pozdniakov, S., Price, J. W., Procureur, S., Puckett, A. J. R., Raue, B. A., Rimal, D., Ripani, M., Ritchie, B. G., Rizzo, A., Rosner, G., Roy, P., Sabatié, F., Salgado, C., Schott, D., Seder, E., Senderovich, I., Smith, E. S., Sokhan, D., Smith, G. D., Stepanyan, S., Strauch, S., Tang, W., Voskanyan, H., Voutier, E., Walford, N. K., Watts, D. P., Weinstein, L. B., Williams, M., Wood, M. H., Zachariou, N., Zana, L., Zhang, J., Ziegler, V., Zhao, Z. W., and Zonta, I.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Physical Review Letters
• Publisher: American Physical Society
• ISSN: 0031-9007
• ISSN (Online): 1079-7114