Bochum 2009 – wissenschaftliches Programm

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HK: Fachverband Hadronen und Kerne

HK 35: Hadron Structure and Spectroscopy II

HK 35.5: Vortrag

Dienstag, 17. März 2009, 18:00–18:15, H-ZO 30

QCD Sum Rules for D and B mesons in nuclear matter — •Thomas Hilger, Ronny Thomas, and Burkhard Kämpfer — FZD, PF 510119, 01314 Dresden

We consider D and B mesons embedded in cold nuclear matter in view of future CBM and PANDA experiments at FAIR. QCD sum rules are applied to pseudoscalar currents with heavy-light quark contents. The impact of various condensates is discussed. The mass splitting of D - D-bar and B - B-bar mesons as a function of the nuclear matter density is quantified: extrapolated to saturation density it is in the order of 60 and 130 MeV, respectively, driven essentially by the condensates <q-adjoint q>, <q-adjoint g sigma G q> and <q-bar q>. The genuine chiral condensate <q-bar q>, amplified by heavy-quark masses, enters the Borel transformed sum rules for the mass splitting beyond linear density dependence. Including strange quark condensates reveals a numerically smaller and opposite effect for the D_s - D_s-bar mass splitting. Weinberg type sum rules for the difference of pseudoscalar and scalar spectral moments are discussed.