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Inclusion of \(K\Lambda \) electroproduction data in a coupled channel analysis

  • Regular Article - Theoretical Physics
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Abstract

Exclusive electroproduction reactions provide an access to the structure of excited baryons. To extract electroproduction multipoles encoding this information, the Jülich–Bonn–Washington (JBW) analysis framework is extended to the analysis of differential cross sections in \(K\Lambda \) electroproduction. This update enlarges the scope of previous coupled-channel analyses of pions and eta mesons, with photoproduction reactions as boundary condition in all analyzed electroproduction reactions. Polarization observables are predicted and compared to recent CLAS data. The comparison shows the relevance of these data to pin down baryon properties.

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Data Availability Statement

This manuscript has no associated data or the data will not be deposited. [Authors’ comment: The fit results in form of multipoles are available upon request from the authors.]

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Acknowledgements

The authors thank Daniel Carman, Viktor Mokeev, and Igor Strakovsky for making data available as well as for inspiring discussions, and DC and VM for a careful reading of the manuscript. The work of MM, UGM and DR was supported in part by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) through the funds provided to the Sino-German Collaborative Research Center TRR110 “Symmetries and the Emergence of Structure in QCD” (DFG Project ID 196253076 - TRR 110). The work of UGM was further supported by the Chinese Academy of Sciences (CAS) President’s International Fellowship Initiative (PIFI) (Grant No. 2018DM0034) and by Volkswagen Stiftung (Grant No. 93562). The work of TM was supported by the PUTI Q2 Grant from University of Indonesia under contract No. NKB-663/UN2.RST/HKP.05.00/2022. The work of MD and RW was supported in part by the U.S. Department of Energy grant DE-SC0016582; MD’s work was also supported in part by DOE Office of Science, Office of Nuclear Physics under contract DE-AC05- 06OR23177. The authors gratefully acknowledge computing time on the supercomputer JURECA [209] at Forschungszentrum Jülich under grant no. “baryonspectro” that was used to produce the input at \(Q^2=0\).

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Authors and Affiliations

  1. Helmholtz-Institut für Strahlen- und Kernphysik (Theorie) and Bethe Center for Theoretical Physics, Universität Bonn, 53115, Bonn, Germany

    M. Mai & Ulf-G. Meißner

  2. Institute for Nuclear Studies and Department of Physics, The George Washington University, Washington, DC, 20052, USA

    M. Mai, J. Hergenrather, M. Döring & R. Workman

  3. Thomas Jefferson National Accelerator Facility, Newport News, VA, 23606, USA

    M. Döring

  4. Departemen Fisika, FMIPA, Universitas Indonesia, Depok, 16424, Indonesia

    T. Mart

  5. Institute for Advanced Simulation and Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425, Jülich, Germany

    Ulf-G. Meißner & D. Rönchen

  6. Tbilisi State University, 0186, Tbilisi, Georgia

    Ulf-G. Meißner

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Additional information

Communicated by Laura Tolos.

Appendix A: Multipoles at fixed W

Appendix A: Multipoles at fixed W

Fig. 13
figure 13

Multipoles for the \(\pi N(I=1/2)\) final state obtained through JBW coupled-channel solutions (connected by the shading to guide the eye)including experimental data in \(\pi N, \eta N, K\Lambda \) channels. Total energy is fixed to \(W=1.535~\textrm{GeV}\). Results at other kinematics can be obtained from the JBW web page https://jbw.phys.gwu.edu

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Fig. 14
figure 14

Multipoles for the \(\eta N (I=1/2)\) final state obtained through JBW coupled-channel solutions (connected by the shading to guide the eye) including experimental data in \(\pi N, \eta N, K\Lambda \) channels. Total energy is fixed to \(W=1.535~\textrm{GeV}\). Results at other kinematics can be obtained from the JBW web page https://jbw.phys.gwu.edu

Full size image

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Mai, M., Hergenrather, J., Döring, M. et al. Inclusion of \(K\Lambda \) electroproduction data in a coupled channel analysis. Eur. Phys. J. A 59, 286 (2023). https://doi.org/10.1140/epja/s10050-023-01188-0

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