Title
Medium Modifications of Mesons: Chiral Symmetry Restoration, inmedium QCD Sum Rules for D and B mesons, and BetheSalpeter equa,Used
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The interplay of hadron properties and their modification in an ambient nuclear medium on the one hand and spontaneous chiral symmetry breaking and its restoration on the other hand is investigated. QCD sum rules for various heavylight pseudoscalar mesons embedded in cold nuclear matter are evaluated, the impact of order parameters is investigated and Weinberg type sum rules are derived. The consequences of a chirally symmetric scenario for the rho meson are investigated and the complementarity of mass shift and broadening is discussed. Additionally, the analytic structure of quark propagators in the complex plane is investigated numerically within DysonSchwinger equations. The applicability of BetheSalpter equations for heavylight quarkantiquark bound states in the scalar and pseudoscalar channels by variation of the momentum partitioning parameter is presented. The solutions of the DysonSchwinger equation in the WignerWeyl phase are used to investigate the hadron spectrum with explicit but without dynamical chiral symmetry breaking. An exhaustive introduction to chiral transformations within classical and quantum field theory and currentcurrent correlators is given.
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