Pion-nucleon scattering with decuplet contribution in heavy baryon SU(3) chiral perturbation theory

Autor:	Ou-Yang, Jing, Huang, Bo-Lin
Rok vydání:	2024
Předmět:	Nuclear Theory High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Experiment
Druh dokumentu:	Working Paper
Popis:	We calculate the complete $T$ matrices with decuplet contributions for pion-nucleon scattering to order $\mathcal{O}(\epsilon^3)$ in heavy baryon SU(3) chiral perturbation theory. The baryon mass in the chiral limit $M_0$ and the low-energy constants are determined by fitting to phase shifts of $\pi N$, the experimental octet-baryon masses, and the value of $\sigma_{\pi N}$ simultaneously. By using these constants, we obtain the accurate $KN$ $\sigma$ terms, $\sigma_{KN}^{(1)}=(375.07\pm33.02)$ MeV and $\sigma_{KN}^{(2)}=(275.32\pm32.24)$ MeV. An excellent description of the phase shifts is obtained for all partial waves. We also present results for scattering lengths and scattering volumes. In addition, the convergence of the approach is also discussed. Comment: 27 pages, 6 figures, 4 tables
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2409.09388 Zobrazit plný text záznamu View this record from Arxiv