Two Topics in Chiral Effective Lagrangians
| dc.creator | Yamagishi, Hidenaga | |
| dc.creator | Zahed, Ismail | |
| dc.date | 1998-02-06 | |
| dc.date.accessioned | 2026-07-07T04:03:26Z | |
| dc.date.available | 2026-07-07T04:03:26Z | |
| dc.description | In the absence of nucleons, we use partial wave unitarity, to show that the chiral expansion parameter must be close to $p^2/4πf_π^2$ rather than $p^2/16π^2 f_π^2$ as previously suggested, where $p$ is a typical pion momentum and $f_π$ the pion decay constant. When nucleons are included, we apply the Tani-Foldy-Wouthuysen (TFW) transformation to the pion-nucleon effective Lagrangian to obtain an expansion in powers of $1/m_N$ (inverse nucleon mass). The results are presented up to order ${\cal O} (1/m_N^3)$, corresponding to ${\cal O} (p^4)$ in the momentum. In this case partial wave-unitarity is also lost in about the same range of momenta. | |
| dc.description | 7 pages | |
| dc.identifier | https://arxiv.org/abs/hep-ph/9802260 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/9802260 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/47656 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Two Topics in Chiral Effective Lagrangians | |
| dc.type | text |