Transport analysis of in-medium hadron effects in pA and AA collisions

摘要

The production and decay of vector mesons ($\rho, \omega$) in pA and AAreactions is studied with particular emphasis on their in-medium spectralfunctions. It is explored within transport calculations if hadronic in-mediumdecays like $\pi^+\pi^-$ or $\pi^0 \gamma$ might provide complementaryinformation to their dilepton ($e^+e^-$) decays. Whereas the $\pi^+ \pi^-$signal from the $\rho$-meson is found to be strongly distorted by pionrescattering, the $\omega$-meson Dalitz decay to $\pi^0 \gamma$ appearspromising even for more heavy nuclei in $\gamma A$ and pA reactions.Furthermore, the influence of nucleon and kaon/antikaon potentials on the$K^\pm$ yields and spectra in pA collisions is calculated and compared to therecent data from the ANKE Collaboration.