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Measurement of spin-density matrix elements in $ϕ (1020) \to K_{S}^{0} K_{L}^{0}$ photoproduction with a linearly polarized photon beam at $E_{γ} = 8.2 - 8.8 GeV$

F. Afzal ³, C. S. Akondi ¹¹, M. Albrecht ³⁰, M. Amaryan ²⁶, S. Arrigo³⁶, V. Arroyave¹⁰, A. Asaturyan ³⁰, A. Austregesilo ³⁰, Z. Baldwin ⁵ et al. (GlueX Collaboration)

Z. Baldwin ⁵, F. Barbosa³⁰, J. Barlow ^11,29, E. Barriga ¹¹, R. Barsotti¹⁷, D. Barton ²⁶, V. Baturin²⁶, V. V. Berdnikov ³⁰, T. Black²⁵, W. Boeglin ¹⁰, M. Boer³⁴, W. J. Briscoe ¹², T. Britton³⁰, R. Brunner ¹¹, S. Cao¹¹, E. Chudakov ³⁰, G. Chung ³⁴, P. L. Cole ¹⁹, O. Cortes¹², V. Crede ¹¹, M. M. Dalton ³⁰, D. Darulis ¹⁴, A. Deur ³⁰, S. Dobbs ¹¹, A. Dolgolenko ¹⁸, M. Dugger ¹, R. Dzhygadlo¹⁵, D. Ebersole ¹¹, M. Edo⁸, H. Egiyan ³⁰, T. Erbora ¹⁰, P. Eugenio ¹¹, A. Fabrizi²⁰, C. Fanelli ³⁶, S. Fang ¹⁶, A. M. Foda ¹⁵, M. Fritsch³, S. Furletov ³⁰, L. Gan ²⁵, H. Gao⁹, A. Gardner¹, A. Gasparian²⁴, D. I. Glazier ¹⁴, C. Gleason ³³, V. S. Goryachev ¹⁸, B. Grube ³⁰, J. Guo ⁵, L. Guo¹⁰, J. Hernandez ¹¹, K. Hernandez¹, N. D. Hoffman ⁵, D. Hornidge ²², G. Huber ²⁷, P. Hurck ¹⁴, W. Imoehl ⁵, D. G. Ireland ¹⁴, M. M. Ito ¹¹, I. Jaegle ³⁰, N. S. Jarvis ⁵, T. Jeske³⁰, M. Jing¹⁶, R. T. Jones ⁸, V. Kakoyan³⁸, G. Kalicy⁶, V. Khachatryan¹⁷, C. Kourkoumelis ², A. LaDuke ⁵, I. Larin³⁰, D. Lawrence ³⁰, D. I. Lersch ³⁰, H. Li ³⁶, B. Liu ¹⁶, K. Livingston ¹⁴, L. Lorenti³⁶, V. Lyubovitskij ^32,31, A. Mahmood²⁷, H. Marukyan ³⁸, V. Matveev ¹⁸, M. McCaughan ³⁰, M. McCracken ^5,35, C. A. Meyer ⁵, R. Miskimen ²⁰, R. E. Mitchell ¹⁷, K. Mizutani ³⁰, P. Moran³⁶, V. Neelamana ²⁷, L. Ng ³⁰, E. Nissen ³⁰, S. Orešić²⁷, A. I. Ostrovidov ¹¹, Z. Papandreou ²⁷, C. Paudel ¹⁰, R. Pedroni²⁴, L. Pentchev ³⁰, K. J. Peters¹⁵, E. Prather⁸, L. Puthiya Veetil²⁵, S. Rakshit ¹¹, J. Reinhold ¹⁰, A. Remington ¹¹, B. G. Ritchie ¹, J. Ritman ^3,15, G. Rodriguez ¹¹, D. Romanov ²¹, K. Saldana ¹⁷, C. Salgado ²³, S. Schadmand ¹⁵, A. M. Schertz ¹⁷, K. Scheuer ³⁶, A. Schick²⁰, A. Schmidt ¹², R. A. Schumacher ⁵, J. Schwiening ¹⁵, M. Scott¹², N. Septian ¹¹, P. Sharp ¹², V. Shen ³, X. Shen ¹⁶, M. R. Shepherd ¹⁷, J. Sikes¹⁷, A. Smith ³⁰, E. S. Smith ³⁶, D. I. Sober⁶, A. Somov³⁰, S. Somov²¹, J. R. Stevens ³⁶, I. I. Strakovsky ¹², B. Sumner¹, K. Suresh ³⁶, V. V. Tarasov ¹⁸, S. Taylor ³⁰, A. Teymurazyan²⁷, A. Thiel ¹³, T. Viducic ²⁶, T. Whitlatch³⁰, N. Wickramaarachchi ⁶, Y. Wunderlich ⁴, B. Yu ⁹, J. Zarling ²⁷, Z. Zhang ³⁷, X. Zhou ³⁷, and B. Zihlmann ³⁰ (GlueX Collaboration)

¹Polytechnic Sciences and Mathematics, School of Applied Sciences and Arts, Arizona State University, Tempe, Arizona 85287, USA
²Department of Physics, National and Kapodistrian University of Athens, 15771 Athens, Greece
³Ruhr-Universität-Bochum, Institut für Experimentalphysik, D-44801 Bochum, Germany
⁴Helmholtz-Institut für Strahlen- und Kernphysik Universität Bonn, D-53115 Bonn, Germany
⁵Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, USA
⁶Department of Physics, The Catholic University of America, Washington, DC 20064, USA ⁷School of Mathematics and Physics, China University of Geosciences, Wuhan 430074, People's Republic of China
⁸Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
⁹Department of Physics, Duke University, Durham, North Carolina 27708, USA
¹⁰Department of Physics, Florida International University, Miami, Florida 33199, USA
¹¹Department of Physics, Florida State University, Tallahassee, Florida 32306, USA
¹²Department of Physics, The George Washington University, Washington, DC 20052, USA
¹³Physikalisches Institut, Justus-Liebig-Universität Gießen, D-35390 Gießen, Germany
¹⁴School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, United Kingdom
¹⁵GSI Helmholtzzentrum für Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
¹⁶Institute of High Energy Physics, Beijing 100049, People's Republic of China
¹⁷Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
¹⁸National Research Centre Kurchatov Institute, Moscow 123182, Russia
¹⁹Department of Physics, Lamar University, Beaumont, Texas 77710, USA
²⁰Department of Physics, University of Massachusetts, Amherst, Massachusetts 01003, USA
²¹National Research Nuclear University Moscow Engineering Physics Institute, Moscow 115409, Russia
²²Department of Physics, Mount Allison University, Sackville, New Brunswick, Canada E4L 1E6
²³Department of Physics, Norfolk State University, Norfolk, Virginia 23504, USA
²⁴Department of Physics, North Carolina A&T State University, Greensboro, North Carolina 27411, USA
²⁵Department of Physics and Physical Oceanography, University of North Carolina at Wilmington, Wilmington, North Carolina 28403, USA
²⁶Department of Physics, Old Dominion University, Norfolk, Virginia 23529, USA
²⁷Department of Physics, University of Regina, Regina, Saskatchewan, Canada S4S 0A2 ²⁸Departamento de Física, Universidad Técnica Federico Santa María, Casilla 110-V, Valparaíso, Chile
²⁹Department of Mathematics, Physics, and Computer Science, Springfield College, Springfield, Massachusetts 01109, USA
³⁰Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
³¹Laboratory of Particle Physics, Tomsk Polytechnic University, 634050 Tomsk, Russia
³²Department of Physics, Tomsk State University, 634050 Tomsk, Russia
³³Department of Physics and Astronomy, Union College, Schenectady, New York 12308, USA
³⁴Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
³⁵Department of Physics, Washington & Jefferson College, Washington, Pennsylvania 15301, USA
³⁶Department of Physics, William & Mary, Williamsburg, Virginia 23185, USA
³⁷School of Physics and Technology, Wuhan University, Wuhan, Hubei 430072, People's Republic of China
³⁸A. I. Alikhanyan National Science Laboratory (Yerevan Physics Institute), 0036 Yerevan, Armenia

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Phys. Rev. C 112, 025203 – Published 26 August, 2025

DOI: https://doi.org/10.1103/2tdc-5by6

Abstract

We measure the spin-density matrix elements (SDMEs) for the photoproduction of $ϕ (1020)$ off of the proton in its decay to $K_{S}^{0} K_{L}^{0}$ , using 105 ${pb}^{- 1}$ of data collected with a linearly polarized photon beam using the GlueX experiment. The SDMEs are measured in nine bins of the squared four-momentum transfer $t$ in the range $- t = 0.15 - 1.0$ ${GeV}^{2}$ , providing the first measurement of their $t$ dependence for photon beam energies of $E_{γ} = 8.2 - 8.8$ GeV. We confirm the dominance of Pomeron exchange in this region and put constraints on the contribution of other Regge exchanges. We also find that helicity amplitudes where the helicity of the photon and $ϕ (1020)$ differ by two units are negligible.

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References (26)

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Phys. Rev. C 112, 025203– Published 26 August, 2025

Vol. 112, Iss. 2 — August 2025

Received 3 April 2025
Accepted 21 July 2025

DOI: https://doi.org/10.1103/2tdc-5by6

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP³.

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Measurement of spin-density matrix elements in $ϕ (1020) \to K_{S}^{0} K_{L}^{0}$ photoproduction with a linearly polarized photon beam at $E_{γ} = 8.2 - 8.8 GeV$

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Measurement of spin-density matrix elements in ϕ(1020)→KS0KL0 photoproduction with a linearly polarized photon beam at Eγ=8.2–8.8 GeV

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Measurement of spin-density matrix elements in $ϕ (1020) \to K_{S}^{0} K_{L}^{0}$ photoproduction with a linearly polarized photon beam at $E_{γ} = 8.2 - 8.8 GeV$