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e~+e~- PAIR PRODUCTION FROM NUCLEON TARGETS IN THE RESONANCE REGION

机译:e〜+ e〜-共振区域中的核目标对产生

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摘要

We discuss two processes, the πN → e~+e~- N and the γN → e~+e~- N reactions, below and close to the vector meson production threshold (1.40 < s~(1/2) < 1.75 GeV). The aim is to gain understanding of the coupling of vector fields (associated with ρ~0- and ω-mesons) to low-lying baryon resonances. These couplings are not well-known and important for baryon structure studies and for dynamical descriptions of vector meson propagation in the nuclear medium. The e~+e~- pair production amplitudes are determined by the πN → ρ~0N, πN → ωN, γN → ρ~0N and γN → ωN amplitudes supplemented by the Vector Meson Dominance assumption. The vector meson production amplitudes are calculated consistently using a relativistic and unitary coupled-channel approach to meson-nucleon scattering. We display results showing the importance of the quantum interference between ρ~0 - and ω-mesons in the e~+e~- channel to unravel the strength of the coupling of ρ~0 - and ω-mesons to specific baryon excitations. The πN → e~+e~- N and γN → e~+e~- N reactions underlie the more complex πA → e~+e~- X and γA → e~+e~- X nuclear processes whose measurement is planned at GSI (with the HADES detector) and under analysis at JLab (with the CLAS detector).
机译:我们讨论了以下两个过程,即πN→e〜+ e〜-N反应和γN→e〜+ e〜-N反应,低于和接近矢量介子产生阈值(1.40

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