Beam-recoil transferred polarization in K+Y electroproduction in the nucleon resonance region with CLAS12

CLAS Collaboration

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Beam-recoil transferred polarizations for the exclusive electroproduction of K+Λ and K+ς0 final states from an unpolarized proton target have been measured 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 Q2 from 0.3 to 4.5 GeV2 and invariant energy W from 1.6 to 2.4 GeV, while covering the full center-of-mass angular range of the K+. These new data extend the existing hyperon polarization data from CLAS in a similar kinematic range but from a significantly larger dataset. They represent an important addition to the world data, allowing for better exploration of the reaction mechanism in strangeness production processes, for further understanding of the spectrum and structure of excited nucleon states, and for improved insight into the strong interaction in the regime of nonperturbative dynamics.

Original languageEnglish
Article number065201
JournalPhysical Review C
Issue number6
Publication statusPublished - Jun 2022

Bibliographical note

Funding Information:
We thank Petr Bydžovský, Dalibor Skoupil, and Terry Mart for their efforts in preparing the model calculations for this paper and the CLAS12 RG-K team for their feedback throughout this analysis work. We acknowledge the outstanding efforts of the staff of the Accelerator and the Physics Divisions at Jefferson Lab in making this experiment possible. This work was supported in part by the U.S. Department of Energy, the National Science Foundation (NSF), the Italian Istituto Nazionale di Fisica Nucleare (INFN), the French Centre National de la Recherche Scientifique (CNRS), the French Commissariat pour l'Energie Atomique, the UK Science and Technology Facilities Council, the National Research Foundation (NRF) of Korea, the HelmholtzForschungsakademie Hessen für FAIR (HFHF), the Chilean Agencia Nacional de Investigacion y Desarollo ANID PIA/APOYO AFB180002, and the Skobeltsyn Nuclear Physics Institute and Physics Department at the Lomonosov Moscow State University. The Southeastern Universities Research Association (SURA) operates the Thomas Jefferson National Accelerator Facility for the U.S. Department of Energy under Contract No. DE-AC05-06OR23177.

Publisher Copyright:
© 2022 American Physical Society.

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