Impact of the QCD four-quark condensate on in-medium spectral changes of light vector mesons

S. Zschocke, O. P. Pavlenko, B. Kampfer

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 $\rho$, $\omega$ and $\varphi$ in nucle…