dorsal/arxiv
View SchemaHints on the quadrupole deformation of the $\Delta$(1232)
| Authors | C. Fernandez-Ramirez, E. Moya de Guerra, J. M. Udias |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0601037 |
| URL | https://arxiv.org/abs/nucl-th/0601037 |
| DOI | 10.1103/PhysRevC.73.042201 |
| Journal | Phys.Rev. C73 (2006) 042201 |
Abstract
The E2/M1 ratio (EMR) of the $\Delta$(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 $\Delta$(1232) resonance. The \textit{bare} s-channel $\Delta$(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.
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"abstract": "The E2/M1 ratio (EMR) of the $\\Delta$(1232) is extracted from the world data\nin pion photoproduction by means of an Effective Lagrangian Approach (ELA).This\nquantity has been derived within a crossing symmetric, gauge invariant, and\nchiral symmetric Lagrangian model which also contains a consistent modern\ntreatment of the $\\Delta$(1232) resonance. The \\textit{bare} s-channel\n$\\Delta$(1232) contribution is well isolated and Final State Interactions (FSI)\nare effectively taken into account fulfilling Watson\u0027s theorem. The obtained\nEMR value, EMR$=(-1.30\\pm0.52)$%, is in good agreement with the latest lattice\nQCD calculations [Phys. Rev. Lett. 94, 021601 (2005)] and disagrees with\nresults of current quark model calculations.",
"arxiv_id": "nucl-th/0601037",
"authors": [
"C. Fernandez-Ramirez",
"E. Moya de Guerra",
"J. M. Udias"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.73.042201",
"journal_ref": "Phys.Rev. C73 (2006) 042201",
"title": "Hints on the quadrupole deformation of the $\\Delta$(1232)",
"url": "https://arxiv.org/abs/nucl-th/0601037"
},
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