Wilson coefficients and four-quark condensates in QCD sum rules for medium modifications of D mesons

被引：19
|
作者：
Buchheim, T. [1 ,2 ]
Hilger, T. [3 ]
Kaempfer, B. [1 ,2 ]
机构：
[1] Helmholtz Zentrum Dresden Rossendorf, D-01314 Dresden, Germany
[2] Tech Univ Dresden, Inst Theoret Phys, D-01062 Dresden, Germany
[3] Graz Univ, Inst Phys, NAWI Graz, A-8010 Graz, Austria
来源：
PHYSICAL REVIEW C | 2015年 / 91卷 / 01期
基金：
奥地利科学基金会;
关键词：
FINITE-TEMPERATURE; CHIRAL-SYMMETRY; DECAY CONSTANTS; NUCLEAR-MATTER; VECTOR-MESONS; QUARK MASSES; HEAVY QUARK; RHO-MESON; RESTORATION; HADRONS;
D O I：
10.1103/PhysRevC.91.015205
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
Wilson coefficients of light four-quark condensates in QCD sum rules are evaluated for pseudoscalar D mesons, thus pushing the sum rules toward mass dimension 6. In contrast to the situation for (q) over barq mesons, the impact of the four-quark condensates for vacuum as well as in-medium situations is found to be rather small within the Borel window used in previous analyses. The complete four-quark condensate contributions enable us to identify candidates for an order parameter of spontaneous chiral symmetry breaking and/or restoration as well as to evaluate stability criteria of operator product expansions.
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页数：13
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