Impact of the QCD four-quark condensate on in-medium spectral changes of light vector mesons
| dc.creator | Zschocke, S. | |
| dc.creator | Pavlenko, O. P. | |
| dc.creator | Kampfer, B. | |
| dc.date | 2003-08-06 | |
| dc.date.accessioned | 2026-07-07T03:50:21Z | |
| dc.date.available | 2026-07-07T03:50:21Z | |
| dc.description | Within the Borel QCD sum rule approach at finite baryon density we study the role of the four-quark condensates for the modifications of the vector mesons $ρ$, $ω$ and $ϕ$ in nuclear matter. We find that in-medium modifications of the $ρ$ and $ω$ mesons are essentially dominated by the dependence of the 4-quark condensate on the nucleon density. In particular, the numerical value of a parameter ($κ_N$), which describes the strength of the density dependence of the 4-quark condensate beyond the mean-field approximation, governs the decrease of the $ρ$ mass as a function of the density. For the $ω$ meson the sign of the in-medium mass shift is changed by variations of $κ_N$. To study consistently the in-medium broadening of the light vector mesons we employ $ρN$ and $ωN$ scattering amplitudes derived recently from a covariant unitary coupled channel approach adjusted to pion- and photo-induced reactions. In contrast to the $ρ$ and $ω$ mesons, the in-medium mass of the $ϕ$ meson is directly related to the chiral (strange) quark condensate. Measurements of the vector meson spectral change in heavy-ion collisions with HADES can shed light on the yet unknown density dependence of the 4-quark condensate. | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0308070 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0308070 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/42738 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Impact of the QCD four-quark condensate on in-medium spectral changes of light vector mesons | |
| dc.type | text |