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.

引用

页数：13

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