科研之友
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摘要
The correlation function between two Polyakov loops encodes the free-energy shift due to a pair of separated color-conjugated sources in the hot QCD medium. This is analyzed in terms of a novel Kallen-Lehmann spectral representation for the separating distance, implying an increasing and concave free-energy at all temperatures. We express the heavy (Q) over barQ free-energy shift below the phase transition in QCD in terms of color-neutral purely hadronic states with no explicit reference to quarks and gluons. Good agreement with lattice data is achieved when considering the avoided crossing mechanism underlying string breaking and with standard quenched values of the string tension known from charmonium and bottomonium phenomenology. We also address the role of the corresponding entropy shift and its renormalization group properties.
- 出版日期2016-11-21
