Conformal versus confining scenario in SU(2) with adjoint fermions
Conformal versus confining scenario in SU(2) with adjoint fermions
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DOI：
10.1103/physrevd.80.074507
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发表时间：
2009-07
影响因子：
5
通讯作者：
L. Debbio;B. Lucini;A. Patella;C. Pica;A. Rago
中科院分区：
文献类型：
--
作者：
L. Debbio;B. Lucini;A. Patella;C. Pica;A. Rago
在晶格上测量了SU(2)规范理论的介子和胶子区中最低能级的质量，当晶格耦合{beta}=4/g{sub0}{sup 2}=2.25时，裸费米子质量m{sub0}跨越了猝灭和无质量极限之间的范围，并且对于不同的晶格体积。即使对于轻组成的费米子，最轻的胶球也被发现比最轻的介子轻。此外，两个静态基本源之间的弦张力强烈地依赖于动力学费米子的质量，并且在达到手征极限之前变为反平方晶格线性尺寸的数量级。讨论了这些发现对无质量极限理论阶段的影响，并概述了区分(近)保角情形和限制情形的策略。
The masses of the lowest-lying states in the meson and in the gluonic sector of an SU(2) gauge theory with two Dirac flavors in the adjoint representation are measured on the lattice at a fixed value of the lattice coupling {beta}=4/g{sub 0}{sup 2}=2.25 for values of the bare fermion mass m{sub 0} that span a range between the quenched regime and the massless limit, and for various lattice volumes. Even for light constituent fermions the lightest glueballs are found to be lighter than the lightest mesons. Moreover, the string tension between two static fundamental sources strongly depends on the mass of the dynamical fermions and becomes of the order of the inverse squared lattice linear size before the chiral limit is reached. The implications of these findings for the phase of the theory in the massless limit are discussed and a strategy for discriminating between the (near-)conformal and the confining scenario is outlined.