Hints on the quadrupole deformation of the $Δ$(1232)
| dc.creator | Fernandez-Ramirez, C. | |
| dc.creator | de Guerra, E. Moya | |
| dc.creator | Udias, J. M. | |
| dc.date | 2006-01-11 | |
| dc.date | 2006-04-18 | |
| dc.date.accessioned | 2026-07-07T06:59:41Z | |
| dc.date.available | 2026-07-07T06:59:41Z | |
| dc.description | The E2/M1 ratio (EMR) of the $Δ$(1232) is extracted from the world data in pion photoproduction by means of an Effective Lagrangian Approach (ELA).This quantity has been derived within a crossing symmetric, gauge invariant, and chiral symmetric Lagrangian model which also contains a consistent modern treatment of the $Δ$(1232) resonance. The \textit{bare} s-channel $Δ$(1232) contribution is well isolated and Final State Interactions (FSI) are effectively taken into account fulfilling Watson's theorem. The obtained EMR value, EMR$=(-1.30\pm0.52)$%, is in good agreement with the latest lattice QCD calculations [Phys. Rev. Lett. 94, 021601 (2005)] and disagrees with results of current quark model calculations. | |
| dc.description | Enlarged conclusions and explanations on the E2/M1 ratio. Figure 3 improved. References updated. 5 pages. 3 figures. 2 tables. Accepted for publication in Physical Review C | |
| dc.identifier | https://arxiv.org/abs/nucl-th/0601037 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/0601037 | |
| dc.identifier | Phys.Rev. C73 (2006) 042201 | |
| dc.identifier | doi:10.1103/PhysRevC.73.042201 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/107835 | |
| dc.subject | Nuclear Theory | |
| dc.title | Hints on the quadrupole deformation of the $Δ$(1232) | |
| dc.type | text |