First measurement of Ξ− polarization in photoproduction

Bono, J. et al. (2018) First measurement of Ξ− polarization in photoproduction. Physics Letters B, 783, pp. 280-286. (doi:10.1016/j.physletb.2018.07.004)

Bono, J. et al. (2018) First measurement of Ξ− polarization in photoproduction. Physics Letters B, 783, pp. 280-286. (doi:10.1016/j.physletb.2018.07.004)

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Abstract

Despite decades of studies of the photoproduction of hyperons, both their production mechanisms and their spectra of excited states are still largely unknown. While the parity-violating weak decay of hyperons offers a means of measuring their polarization, which could help discern their production mechanisms and identify their excitation spectra, no such study has been possible for doubly strange baryons in photoproduction, due to low production cross sections. However, by making use of the reaction γ p → K + K +−, we have measured, for the first time, the induced polarization, P, and the transferred polarization from circularly polarized real photons, characterized by Cx and Cz , to recoiling −s. The data were obtained using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab for photon energies from just over threshold (2.4 GeV) to 5.45 GeV. These first-time measurements are compared, and are shown to broadly agree, with model predictions in which cascade photoproduction proceeds through the decay of intermediate hyperon resonances that are produced via relativistic meson exchange, offering a new step forward in the understanding of the production and polarization of doublystrange baryons.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Sokhan, Dr Daria and McKinnon, Dr Bryan and Livingston, Dr Kenneth and Montgomery, Dr Rachel and Glazier, Dr Derek and Protopopescu, Dr Dan and Ireland, Professor David and MacGregor, Professor I and Rosner, Professor Guenther
Authors: Bono, J., Guo, L., Raue, B.A., Adhikari, S., Kunkel, M.C., Adhikari, K.P., Akbar, Z., Amaryan, M.J., Ball, J., Barion, L., Bashkanov, M., Battaglieri, M., Batourine, V., Bedlinskiy, I., Biselli, A.S., Brooks, W.K., Burkert, V.D., Cao, F., Carman, D.S., Celentano, A., Charles, G., Chetry, T., Ciullo, G., Clary, B. A., Cole, P.L., Contalbrigo, M., Crede, V., D'Angelo, A., Dashyan, N., De Vita, R., Defurne, M., Deur, A., Diehl, S., Djalali, C., Dugger, M., Egiyan, H., El Alaoui, A., El Fassi, L., Eugenio, P., Fedotov, G., Filippi, A., Fradi, A., Gavalian, G., Gevorgyan, N., Ghandilyan, Y., Girod, F.X., Glazier, D.I., Gohn, W., Golovatch, E., Gothe, R.W., Griffioen, K.A., Hafidi, K., Harrison, N., Hattawy, M., Heddle, D., Hicks, K., Holtrop, M., Ilieva, Y., Ireland, D.G., Isupov, E.L., Jo, H.S., Johnston, S., Kabir, M.L., Keller, D., Khachatryan, G., Khachatryan, M., Khandaker, M., Kim, A., Kim, W., Klein, A., Klein, F.J., Kubarovsky, V., Lenisa, P., Livingston, K., MacGregor, I.J.D., Markov, N., McKinnon, B., Mineeva, T., Montgomery, R.A., Munoz Camacho, C., Niculescu, G., Osipenko, M., Ostrovidov, A.I., Paolone, M., Paremuzyan, R., Park, K., Pasyuk, E., Phelps, W., Pogorelko, O., Price, J.W., Prok, Y., Protopopescu, D., Ripani, M., Rizzo, A., Rosner, G., Sabatié, F., Salgado, C., Schumacher, R.A., Sharabian, Y., Skorodumina, I., Smith, G.D., Sokhan, D., Sparveris, N., Stepanyan, S., Strakovsky, I.I., Strauch, S., Taiuti, M., Tan, J.A., Ungaro, M., Voskanyan, H., Voutier, E., Wang, R., Wei, X., 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
Journal Name:Physics Letters B
Publisher:Elsevier
ISSN:0370-2693
ISSN (Online):1873-2445
Published Online:09 July 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Physics Letters B 783: 280-286
Publisher Policy:Reproduced under a Creative Commons License

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