First measurement of Xi(-) polarization in photoproduction

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 γp→K+K+Ξ−, 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 Ξ−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 doubly-strange baryons.

Metadata

Item Type:	Article
Authors/Creators:	Bono, J. Guo, L. Raue, B. A. Adhikari, S. Kunkel, M. C. Adhikari, K. P. Akbar, Z. Amaryan, M. J. Barion, L. Bashkanov, M. https://orcid.org/0000-0001-9822-9433 Battaglieri, M. Batourine, V. Bedlinskiy, I. Biselli, A. S. Burkert, V. D. Cao, F. Carman, D. S. Celentano, A. Charles, G. Chetry, T. Ciullo, G. Clary, Brandon 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, Iu Sokhan, D. Sparveris, N. Stepanyan, S. Strakovsky, I. I. Strauch, S. Taiuti, M. Ungaro, M. Voskanyan, H. Voutier, E. Zachariou, N. Zana, L. Zhao, Z. W.
Copyright, Publisher and Additional Information:	© 2018 The Author(s). Published by Elsevier B.V.
Keywords:	Cascade,Hyperon spectroscopy,Photoproduction,Polarization,Strange,Xi
Dates:	Published: 10 August 2018 Published (online): 9 July 2018 Accepted: 2 July 2018
Institution:	The University of York
Academic Units:	The University of York > Faculty of Sciences (York) > Physics (York) The University of York > Faculty of Sciences (York) > Health Sciences (York) The University of York > Faculty of Arts and Humanities (York) > Music (York) The University of York > Faculty of Social Sciences (York) > Economics and Related Studies (York) The University of York > Faculty of Social Sciences (York) > The York Management School The University of York > Faculty of Sciences (York) > Electronic Engineering (York) The University of York > Faculty of Social Sciences (York) > Politics (York) The University of York > Faculty of Sciences (York) > Mathematics (York)
Depositing User:	Pure (York)
Date Deposited:	17 Sep 2018 15:00
Last Modified:	21 Jan 2025 17:35
Published Version:	https://doi.org/10.1016/j.physletb.2018.07.004
Status:	Published
Refereed:	Yes
Identification Number:	10.1016/j.physletb.2018.07.004
Related URLs:	http://www.scopus.com/inward/record.url?...
Open Archives Initiative ID (OAI ID):	oai:eprints.whiterose.ac.uk:135829