Determination of π^0 meson quadrupole polarizabilities from the process γγ-> π^0π^0
| dc.creator | Fil'kov, L. V. | |
| dc.creator | Kashevarov, V. L. | |
| dc.date | 2005-05-19 | |
| dc.date | 2005-07-05 | |
| dc.date.accessioned | 2026-07-07T10:30:40Z | |
| dc.date.available | 2026-07-07T10:30:40Z | |
| dc.description | A fit of the experimental data to the total cross section of the process γγ->π^0π^0 in the energy region from 270 to 2250 MeV has been carried out using dispersion relations for the invariant amplitudes where the quadrupole polarizabilities are free parameters. As a result the sum and difference of the electric and magnetic quadrupole polarizabilities of the π^0 meson have been found for the first time: (\alpha2+\beta2)_π^0=(-0.181+-0.004)*10^{-4}fm^5, (\alpha2-\beta2)_pi^0=(39.70+-0.02)*10^{-4}fm^5. In addition, dispersion sum rules have been constructed for this sum and difference, respectively. The values of (\alpha2-\beta2)_π^0 and (\alpha2+\beta2)_π^0 extracted from the experimental data on the process γγ->π^0π^0 are in good agreement with the result of calculations in the framework of these dispersion sum rules. | |
| dc.description | 7 pages, 2 figures; added references and comments, version to appear in Phys. Rev. C | |
| dc.identifier | https://arxiv.org/abs/nucl-th/0505058 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/0505058 | |
| dc.identifier | Phys.Rev.C72:035211,2005 | |
| dc.identifier | doi:10.1103/PhysRevC.72.035211 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/178197 | |
| dc.subject | Nuclear Theory | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.subject | Nuclear Experiment | |
| dc.title | Determination of π^0 meson quadrupole polarizabilities from the process γγ-> π^0π^0 | |
| dc.type | text |