TY  - JOUR
AU  - Ilner, A.
AU  - Cabrera, D.
AU  - Markert, C.
AU  - Bratkovskaya, E.
PY  - 2017
DA  - 2017//
TI  - K* vector meson resonance dynamics in heavy-ion collisions
T2  - Phys. Rev. C
JO  - Physical Review C
SP  - 014903
EP  - 15pp
VL  - 95
IS  - 1
PB  - Amer Physical Soc
AB  - We study the strange vector meson (K*, (K) over bar*) dynamics in relativistic heavy-ion collisions based on the microscopic parton-hadron-string dynamics (PHSD) transport approach which incorporates partonic and hadronic degrees of freedom, a phase transition from hadronic to partonic matter-quark-gluon-plasma (QGP)-and a dynamical hadronization of quarks and antiquarks as well as final hadronic interactions. We investigate the role of in-medium effects on the K*, (K) over bar* meson dynamics by employing Breit-Wigner spectral functions for the K* with self-energies obtained from a self-consistent coupled-channelG-matrix approach. Furthermore, we confront the PHSD calculations with experimental data for p + p, Cu + Cu, and Au + Au collisions at energies up to root s(NN) = 200 GeV. Our analysis shows that, at relativistic energies, most of the final K* (observed experimentally) are produced during the late hadronic phase, dominantly by the K + pi -> K* channel, such that the fraction of the K* from the QGP is small and can hardly be reconstructed from the final observables. The influence of the in-medium effects on the K* dynamics at energies typical of the BNL Relativistic Heavy Ion Collider is rather modest due to their dominant production at low baryon densities (but high meson densities); however, it increases with decreasing beam energy. Moreover, we find that the additional cut on the invariant-mass region of the K* further influences the shape and the height of the final spectra. This imposes severe constraints on the interpretation of the experimental results.
SN  - 2469-9985
UR  - http://arxiv.org/abs/1609.02778
UR  - https://doi.org/10.1103/PhysRevC.95.014903
DO  - 10.1103/PhysRevC.95.014903
LA  - English
N1  - WOS:000391859800003
ID  - Ilner_etal2017
ER  -