The soft-energy region in the radiative decay of bound states
| dc.creator | Ruiz-Femenia, Pedro D. | |
| dc.date | 2007-05-09 | |
| dc.date | 2007-09-20 | |
| dc.date.accessioned | 2026-07-07T11:20:35Z | |
| dc.date.available | 2026-07-07T11:20:35Z | |
| dc.description | The orthopositronium decay to three photons is studied in the phase-space region where one of the photons has an energy comparable to the relative three-momentum of the e+e- system (w ~ m alpha). The NRQED computation in this regime shows that the dominant contribution arises from distances ~ 1/(mw)^(1/2), which allows to treat the Coulomb interaction perturbatively. The small-photon energy expansion of the 1-loop decay spectrum from full QED yields the same result as the effective theory. By doing the threshold expansion of the 1-loop QED amplitude we confirm that the leading term arises from a loop-momentum region where q^0 ~ q^2/m ~ w. This corresponds to a new non-relativistic loop-momentum region, which has to be taken into account for the description of a non-relativistic particle-antiparticle system that decays through soft photon emission. | |
| dc.description | 28 pages, 5 figures; typos corrected, one reference added, published version | |
| dc.identifier | https://arxiv.org/abs/0705.1330 | |
| dc.identifier | http://arxiv.org/abs/0705.1330 | |
| dc.identifier | Nucl.Phys.B788:21-46,2008 | |
| dc.identifier | doi:10.1016/j.nuclphysb.2007.07.013 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/194003 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | The soft-energy region in the radiative decay of bound states | |
| dc.type | text |