Low-Energy Thermal Photons from Meson-Meson Bremsstrahlung
| dc.creator | Liu, W. | |
| dc.creator | Rapp, R. | |
| dc.date | 2006-04-13 | |
| dc.date | 2007-09-04 | |
| dc.date.accessioned | 2026-07-07T11:07:29Z | |
| dc.date.available | 2026-07-07T11:07:29Z | |
| dc.description | Within an effective hadronic model including electromagnetic interactions via a U$_{\rm em}$(1) gauge, we reinvestigate photon Bremsstrahlung from a hot hadronic gas as expected to be formed in relativistic heavy-ion collisions at SPS energies. We calculate photon emission from the reactions $ππ\toππγ$ and $πK \toπKγ$ by an explicit (numerical) evaluation of the multi-dimensional phase space integral. This, in particular, allows to avoid the commonly employed soft photon approximation (SPA), as well as to incorporate final-state thermal enhancement factors. % during the hadronic stage of the fireball. Both improvements are shown to result in an appreciable increase of the photon production rate over previous hadronic calculations. Upon convolution over a thermal fireball we find an improvement in the description of recent low transverse-momentum WA98 data at SPS. The influence of both Landau-Pomeranchuk-Migdal and in-medium effects on "$σ$" and $ρ$-meson exchanges are briefly discussed. | |
| dc.description | version to appear in Nucl. Phys. A | |
| dc.identifier | https://arxiv.org/abs/nucl-th/0604031 | |
| dc.identifier | http://arxiv.org/abs/nucl-th/0604031 | |
| dc.identifier | Nucl.Phys.A796:101-121,2007 | |
| dc.identifier | doi:10.1016/j.nuclphysa.2007.08.014 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/189861 | |
| dc.subject | Nuclear Theory | |
| dc.title | Low-Energy Thermal Photons from Meson-Meson Bremsstrahlung | |
| dc.type | text |