Screening versus confinement in 1+1 dimensions

被引:145
作者
Gross, DJ
Klebanov, IR
Matytsin, AV
Smilga, AV
机构
[1] MIT,CTR THEORET PHYS,CAMBRIDGE,MA 02139
[2] ITEP,MOSCOW 117259,RUSSIA
基金
美国国家科学基金会;
关键词
D O I
10.1016/0550-3213(95)00655-9
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
We show that, in (1 + 1)-dimensional gauge theories, a heavy probe charge is screened by dynamical massless fermions both in the case when the source and the dynamical fermions belong to the same representation of the gauge group and, unexpectedly, in the case when the representation of the probe charge is smaller than the representation of the massless fermions. Thus, a fractionally charged heavy probe is screened by dynamical fermions of integer charge in the massless Schwinger model, and a colored probe in the fundamental representation is screened in QCD(2) with adjoint massless Majorana fermions. The screening disappears and confinement is restored as soon as the dynamical fermions are given a non-zero mass. For small masses, the string tension is given by the product of the light fermion mass and the fermion condensate with a known numerical coefficient. Parallels with (3 + 1)-dimensional QCD and supersymmetric gauge theories are discussed.
引用
收藏
页码:109 / 130
页数:22
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