Electric and magnetic screenings of gluons in a model with a dimension-2 gluon condensate  

作　　者：徐甫坤 黄梅 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences [2]Theoretical Physics Center for Science Facilities,Chinese Academy of Sciences

出　　处：《Chinese Physics C》2013年第1期51-57,共7页中国物理C（英文版）

基　　金：Supported by NSFC(11275213);DFG and NSFC(CRC110);CAS(KJCX2-EW-N01);K. C. Wong Education Foundation;CAS Program "Outstanding Young Scientists Abroad Brought in and Youth Innovation Promotion Association of CAS

摘　　要：Electric and magnetic screenings of the thermal gluons are studied by using the background expansion method in a gluodynamic model with gauge invariant dimension-2 gluon condensate at zero momentum. At low temperature, the electric and magnetic gluons are degenerate. With the increase of temperature, it is found that the electric and magnetic gluons start to split at certain temperature T0. The electric screening mass changes rapidly with temperature when T 〉 T0, and the Polyakov loop expectation value rises sharply around T0 from zero in the vacuum to a value around 0.8 at high temperature. This suggests that the color electric deconfinement phase transition is driven by electric gluons. It is also observed that the magnetic screening mass keeps almost the same as its vacuum value, which manifests that the magnetic gluons remain confined. Both the screening masses and the Polyakov loop results are qualitatively in agreement with the Lattice calculations.Electric and magnetic screenings of the thermal gluons are studied by using the background expansion method in a gluodynamic model with gauge invariant dimension-2 gluon condensate at zero momentum. At low temperature, the electric and magnetic gluons are degenerate. With the increase of temperature, it is found that the electric and magnetic gluons start to split at certain temperature T0. The electric screening mass changes rapidly with temperature when T 〉 T0, and the Polyakov loop expectation value rises sharply around T0 from zero in the vacuum to a value around 0.8 at high temperature. This suggests that the color electric deconfinement phase transition is driven by electric gluons. It is also observed that the magnetic screening mass keeps almost the same as its vacuum value, which manifests that the magnetic gluons remain confined. Both the screening masses and the Polyakov loop results are qualitatively in agreement with the Lattice calculations.

关 键 词：dimension-2 gluon condensate color eletric deconfinement color magnetic confinement 

分 类 号：O572.24[理学—粒子物理与原子核物理]