Nucleon resonances in γp→π-Δ++ photoproduction

doi:10.7523/j.ucas.2021.0042

Abstract

Abstract: The first measured high-precision data on the differential cross sections and polarization observable beam asymmetry Σ for the γp→π^-Δ⁺⁺ reaction from the LEPS collaboration are analyzed within a tree-level effective lagrangian approach. In addition to the t-channel π and ρ exchanges, the u-channel Δ exchange, the s-channel N exchange, and the interaction current that is required by the gauge invariance, the s-channel nucleon resonance exchanges are further taken into account to reproduce the data of LEPS. Numerical results show that, the data on Σ can not be well reproduced when no contributions from the s-channel resonance exchanges are introduced. Further analyses show that, by including the contribution from the resonance N(1860)5/2⁺, both the data on the differential cross sections and beam asymmetry Σ can be well reproduced.

Key words: photoproduction reaction, nucleon resonances, effective lagrangian approach

CLC Number:

O572.33

ZHU Yiming, YANG Fuzhong. Nucleon resonances in γp→π^-Δ⁺⁺ photoproduction[J]. Journal of University of Chinese Academy of Sciences, 2024, 41(1): 35-41.

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Nucleon resonances in γp→π^-Δ⁺⁺ photoproduction

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