title: Evidence for in-medium changes of four-quark condensates.
abstract: Utilizing the QCD sum rule approach to the behavior of the omega meson in nuclear matter we derive evidence for in-medium changes of particular four-quark condensates from the recent CB-TAPS experiment for the reaction gamma + A --> A' + omega(--> pi0gamma) with A = Nb and LH2.
authors.affiliation: Institut für Kern- und Hadronenphysik, Forschungszentrum Rossendorf, PF 510119, 01314 Dresden, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Thomas
authors.forename: S
authors.initials: S
authors.lastname: Zschocke
authors.forename: B
authors.initials: B
authors.lastname: Kämpfer