Recoil polarization in <math xmlns="http://www.w3.org/1998/Math/MathML"><mrow><msup><mi>K</mi><mo>+</mo></msup><mi>Y</mi></mrow></math> electroproduction in the nucleon resonance region with CLAS12

CLAS Collaboration; D. S. Carman; A. D'Angelo; L. Lanza; V. I. Mokeev; P. Achenbach; J. S. Alvarado; M. J. Amaryan; H. Atac; H. Avakian; N. A. Baltzell; L. Barion; M. Bashkanov; M. Battaglieri; F. Benmokhtar; A. Bianconi; A. S. Biselli; M. Bondi; S. Boiarinov; F. Bossù; K.-Th. Brinkmann; W. J. Briscoe; S. Bueltmann; V. D. Burkert; T. Cao; R. Capobianco; A. Celentano; P. Chatagnon; V. Chesnokov; G. Ciullo; P. L. Cole; M. Contalbrigo; N. Dashyan; R. De Vita; A. Deur; S. Diehl; C. Dilks; C. Djalali; M. Dugger; R. Dupré; A. El Alaoui; L. El Fassi; L. Elouadrhiri; S. Fegan; A. Filippi; G. Gavalian; D. I. Glazier; R. W. Gothe; Y. Gotra; L. Guo; K. Hafidi; H. Hakobyan; M. Hattawy; F. Hauenstein; T. B. Hayward; D. Heddle; A. Hobart; M. Holtrop; Yu-Chun Hung; Y. Ilieva; D. G. Ireland; E. L. Isupov; H. Jiang; H. S. Jo; T. Kageya; V. Klimenko; A. Kripko; V. Kubarovsky; P. Lenisa; S. Liyanaarachchi; I. J. D. MacGregor; D. Marchand; V. Mascagna; D. Matamoros; M. Maynes; B. McKinnon; T. Mineeva; M. Mirazita; C. Munoz Camacho; P. Nadel-Turonski; T. Nagorna; K. Neupane; S. Niccolai; G. Niculescu; M. Osipenko; P. Pandey; M. Paolone; L. L. Pappalardo; R. Paremuzyan; E. Pasyuk; S. J. Paul; W. Phelps; N. Pilleux; S. Polcher Rafael; J. W. Price; Y. Prok; B. A. Raue; T. Reed; M. Ripani; J. Ritman; P. Rossi; C. Salgado; S. Schadmand; A. Schmidt; M. B. C. Scott; Y. G. Sharabian; S. Shrestha; D. Sokhan; N. Sparveris; N. Spreafico; S. Stepanyan; I. I. Strakovsky; S. Strauch; J. A. Tan; N. Trotta; R. Tyson; M. Ungaro; S. Vallarino; L. Venturelli; T. Vittorini; H. Voskanyan; E. Voutier; Y. Wang; D. P. Watts; U. Weerasinghe; X. Wei; M. H. Wood; L. Xu; N. Zachariou; Z. W. Zhao; M. Zurek

doi:10.1103/nhvq-7fv7

Recoil polarization in $K^{+} Y$ electroproduction in the nucleon resonance region with CLAS12

D. S. Carman ^42,*, A. D'Angelo^23,36, L. Lanza^23,36, V. I. Mokeev⁴², P. Achenbach⁴², J. S. Alvarado³⁵, M. J. Amaryan³⁴, H. Atac⁴⁰, H. Avakian⁴² et al. (CLAS Collaboration)

H. Avakian⁴², N. A. Baltzell⁴², L. Barion¹⁹, M. Bashkanov⁴⁵, M. Battaglieri²¹, F. Benmokhtar¹⁰, A. Bianconi^3,22, A. S. Biselli¹¹, M. Bondi^23,18, S. Boiarinov⁴², F. Bossù³⁷, K.-Th. Brinkmann¹⁵, W. J. Briscoe¹⁴, S. Bueltmann³⁴, V. D. Burkert⁴², T. Cao⁴², R. Capobianco⁸, A. Celentano²¹, P. Chatagnon^37,35, V. Chesnokov³⁸, G. Ciullo^12,19, P. L. Cole²⁷, M. Contalbrigo¹⁹, N. Dashyan⁴⁴, R. De Vita^42,21, A. Deur⁴², S. Diehl^15,8, C. Dilks⁴², C. Djalali³³, M. Dugger², R. Dupré³⁵, A. El Alaoui⁴¹, L. El Fassi²⁹, L. Elouadrhiri⁴², S. Fegan⁴⁵, A. Filippi²⁴, G. Gavalian⁴², D. I. Glazier¹⁷, R. W. Gothe³⁹, Y. Gotra⁴², L. Guo¹³, K. Hafidi¹, H. Hakobyan⁴¹, M. Hattawy³⁴, F. Hauenstein^42,34, T. B. Hayward²⁸, D. Heddle^7,42, A. Hobart³⁵, M. Holtrop³⁰, Yu-Chun Hung³⁴, Y. Ilieva³⁹, D. G. Ireland¹⁷, E. L. Isupov³⁸, H. Jiang¹⁷, H. S. Jo²⁶, T. Kageya⁴², V. Klimenko¹, A. Kripko¹⁵, V. Kubarovsky⁴², P. Lenisa^12,19, S. Liyanaarachchi⁴², I. J. D. MacGregor¹⁷, D. Marchand³⁵, V. Mascagna^3,22, D. Matamoros³⁵, M. Maynes²⁹, B. McKinnon¹⁷, T. Mineeva^43,41, M. Mirazita²⁰, C. Munoz Camacho³⁵, P. Nadel-Turonski^39,42, T. Nagorna²¹, K. Neupane³⁹, S. Niccolai³⁵, G. Niculescu²⁵, M. Osipenko²¹, P. Pandey²⁸, M. Paolone^31,40, L. L. Pappalardo^12,19, R. Paremuzyan^42,30, E. Pasyuk⁴², S. J. Paul⁴, W. Phelps^7,14, N. Pilleux¹, S. Polcher Rafael³⁷, J. W. Price⁵, Y. Prok³⁴, B. A. Raue¹³, T. Reed¹³, M. Ripani²¹, J. Ritman¹⁶, P. Rossi^42,20, C. Salgado^7,32, S. Schadmand¹⁶, A. Schmidt^14,28, M. B. C. Scott¹⁴, Y. G. Sharabian⁴², S. Shrestha⁴⁰, D. Sokhan¹⁷, N. Sparveris⁴⁰, N. Spreafico²¹, S. Stepanyan⁴², I. I. Strakovsky¹⁴, S. Strauch³⁹, J. A. Tan²⁶, N. Trotta⁸, R. Tyson⁴², M. Ungaro⁴², S. Vallarino²¹, L. Venturelli^3,22, T. Vittorini²¹, H. Voskanyan⁴⁴, E. Voutier³⁵, Y. Wang²⁸, D. P. Watts⁴⁵, U. Weerasinghe²⁹, X. Wei⁴², M. H. Wood⁶, L. Xu³⁵, N. Zachariou⁴⁵, Z. W. Zhao⁹, and M. Zurek¹ (CLAS Collaboration)

¹Argonne National Laboratory, Argonne, Illinois 60439
²Arizona State University, Tempe, Arizona 85287
³Università degli Studi di Brescia, 25123 Brescia, Italy
⁴University of California Riverside, 900 University Avenue, Riverside, California 92521
⁵California State University, Dominguez Hills, Carson, California 90747
⁶Canisius College, Buffalo, New York 14208
⁷Christopher Newport University, Newport News, Virginia 23606
⁸University of Connecticut, Storrs, Connecticut 06269
⁹Duke University, Durham, North Carolina 27708
¹⁰Duquesne University, Pittsburgh, Pennsylvania 15282
¹¹Fairfield University, Fairfield, Connecticut 06824
¹²Università di Ferrara, 44121 Ferrara, Italy
¹³Florida International University, Miami, Florida 33199
¹⁴The George Washington University, Washington, D.C. 20052
¹⁵II Physikalisches Institut der Universitaet Giessen, 35392 Giessen, Germany
¹⁶GSI Helmholtzzentrum fur Schwerionenforschung GmbH, D-64291 Darmstadt, Germany
¹⁷University of Glasgow, Glasgow G12 8QQ, United Kingdom
¹⁸INFN, Sezione di Catania, 95123 Catania, Italy
¹⁹INFN, Sezione di Ferrara, 44100 Ferrara, Italy
²⁰INFN, Laboratori Nazionali di Frascati, 00044 Frascati, Italy
²¹INFN, Sezione di Genova, 16146 Genova, Italy
²²INFN, Sezione di Pavia, 27100 Pavia, Italy
²³INFN, Sezione di Roma Tor Vergata, 00133 Rome, Italy
²⁴INFN, Sezione di Torino, 10125 Torino, Italy
²⁵James Madison University, Harrisonburg, Virginia 22807
²⁶Kyungpook National University, Daegu 702-701, Republic of Korea
²⁷Lamar University, 4400 MLK Blvd, Beaumont, Texas 77710
²⁸Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
²⁹Mississippi State University, Mississippi State, Mississippi 39762
³⁰University of New Hampshire, Durham, New Hampshire 03824
³¹New Mexico State University, Las Cruces, New Mexico 88003
³²Norfolk State University, Norfolk, Virginia 23504
³³Ohio University, Athens, Ohio 45701
³⁴Old Dominion University, Norfolk, Virginia 23529
³⁵Université Paris-Saclay, CNRS/IN2P3, IJCLab, 91405 Orsay, France
³⁶Università di Roma Tor Vergata, 00133 Rome, Italy
³⁷IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, France
³⁸Skobeltsyn Nuclear Physics Institute and Physics Department at Lomonosov Moscow State University, 119899 Moscow, Russia
³⁹University of South Carolina, Columbia, South Carolina 29208
⁴⁰Temple University, Philadelphia, Pennsylvania 19122
⁴¹Universidad Técnica Federico Santa María, Casilla 110-V Valparaíso, Chile
⁴²Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606
⁴³Universidad de La Serena, Avda. Juan Cisternas 1200, La Serena, Chile
⁴⁴Yerevan Physics Institute, 375036 Yerevan, Armenia
⁴⁵University of York, York YO10 5DD, United Kingdom

^*Contact author: carman@jlab.org

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Phys. Rev. C 112, 035206 – Published 17 September, 2025

DOI: https://doi.org/10.1103/nhvq-7fv7

Abstract

Hyperon recoil polarization measurements for the exclusive electroproduction of $K^{+} Λ$ and $K^{+} Σ^{0}$ final states from an unpolarized proton target have been carried out using the CLAS12 spectrometer at Jefferson Laboratory. The measurements at beam energies of 6.535 and 7.546 GeV span the range of four-momentum transfer $Q^{2}$ from 0.3 to $4.5 {GeV}^{2}$ and invariant mass $W$ from 1.6 to 2.4 GeV, while covering the full center-of-mass angular range of the $K^{+}$ . These new $Λ$ polarization observables extend the existing data in a similar kinematic range but from a significantly larger dataset. However, they represent the first electroproduction measurements of this observable for the $Σ^{0}$ . These data will allow for better exploration of the reaction mechanism in strangeness production, for further understanding of the spectrum and structure of excited nucleon states that couple to $K Y$ , and for improved insight into the strong interaction in the nonperturbative domain.

Physical Review C

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Recoil polarization in $K^{+} Y$ electroproduction in the nucleon resonance region with CLAS12

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Recoil polarization in K+Y electroproduction in the nucleon resonance region with CLAS12

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Recoil polarization in $K^{+} Y$ electroproduction in the nucleon resonance region with CLAS12