θ and the η′ in large N supersymmetric QCD
θ and the η′ in large N supersymmetric QCD
复制标题
大N超对称QCD中的θ和η′
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Di Xu
中科院分区：
文献类型：
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作者：
M. Dine;P. Draper;Laurel Stephenson;Di Xu
研究了具有小软超对称性破缺项的超对称QCD的大N θ依赖和η势。我们发现SUSY QCD中已知的精确结果反映了大N微扰理论的各种期望，包括分支的存在和理论与物质的关系（Nf≪N和Nf ~ N）。然而，也有与普通QCD和传统大N描述的惊人差异：在控制下，瞬子效应在大N时不会被指数抑制，并且超对称QCD中的分支结构总是与近似离散对称性相关。我们认为这些差异激发了晶格上大N量子cd的进一步研究。
A bstractWe study the large N θ dependence and the η′ potential in supersymmetric QCD with small soft SUSY-breaking terms. Known exact results in SUSY QCD are found to reflect a variety of expectations from large N perturbation theory, including the presence of branches and the behavior of theories with matter (both with Nf ≪ N and Nf ∼ N ). However, there are also striking departures from ordinary QCD and the conventional large N description: instanton effects, when under control, are not exponentially suppressed at large N , and branched structure in supersymmetric QCD is always associated with approximate discrete symmetries. We suggest that these differences motivate further study of large N QCD on the lattice.