Low-energy photon-photon collisions to two loops revisited
| dc.creator | Gasser, Juerg | |
| dc.creator | Ivanov, Mikhail A. | |
| dc.creator | Sainio, Mikko E. | |
| dc.date | 2005-06-25 | |
| dc.date.accessioned | 2026-07-07T11:26:43Z | |
| dc.date.available | 2026-07-07T11:26:43Z | |
| dc.description | In view of ongoing experimental activities to determine the pion polarizabilities, we have started to recalculate the available two-loop expressions in the framework of chiral perturbation theory, because they have never been checked before. We make use of the chiral Lagrangian at order p^6 now available, and of improved techniques to evaluate the two-loop diagrams. Here, we present the result for the neutral pions. The cross section for the reaction gamma+gamma->pi0+pi0 agrees with the earlier calculation within a fraction of a percent. We present analytic results for the dipole and quadrupole polarizabilities, and compare the latter with a recent evaluation from data on gamma+gamma->pi0+pi0. | |
| dc.description | 28 pages, 7-eps figures, 1 table | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0506265 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0506265 | |
| dc.identifier | Nucl.Phys.B728:31-54,2005 | |
| dc.identifier | doi:10.1016/j.nuclphysb.2005.09.010 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/195918 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Low-energy photon-photon collisions to two loops revisited | |
| dc.type | text |