Role of baryon resonances in the $\pi^-p \to ne^+e^-$ reaction within an effective-Lagrangian model
| Autor: | Zétényi, Miklós, Nitt, Deniz, Buballa, Michael, Galatyuk, Tetyana |
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| Rok vydání: | 2020 |
| Předmět: | |
| Zdroj: | Phys. Rev. C 104, 015201 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevC.104.015201 |
| Popis: | We present a study of the reaction $\pi^-p \to ne^+e^-$ for $\sqrt{s}=1.49\,\textrm{GeV}$, including non-resonant Born terms and contributions of the $N(1440)$, $N(1520)$, $N(1535)$ resonances ($R$), using an effective-Lagrangian model, which we extended by a phenomenological phase factor at the $RN\rho$ vertex function. We give predictions for both the differential cross section $d\sigma/dm$ and the spin density matrix elements of the virtual photon that decays into the lepton pair. In the studied energy range, the cross section is dominated by the Born and $N(1520)$ contributions. Comment: 22 pages, 6 figures; data files for Figures 2-6 are provided |
| Databáze: | arXiv |
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