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arXiv 2409.07977hep-phhep-lathep-th
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含两指标对称表示物质的规范理论中的质量等级

Mass hierarchies in gauge theory with two index symmetric representation matter

Anja Alfano, Nick Evans

AI总结:

本研究利用全息模型分析含两指标对称表示与基础表示费米子的SU(Nc)规范理论,发现通过调节基础费米子味数可产生大的动力学质量等级,最大标度间隔因子达13。

摘要:

在规范理论中,人们认为当反常维度γ=1时,费米子双线性算符反常维度的跑动会导致手征对称性破缺。若直接使用微扰结果判断γ=1的条件,在同时包含两指标对称表示和基础表示费米子的模型中,有可能产生大的动力学质量等级。本文我们研究了描述该物理过程的全息模型,以预测介子谱中的标度间隔。我们研究了不同Nc下的SU(Nc)理论,其中包含1味两指标对称表示费米子,并将其作为基础费米子味数NfF的函数进行分析。我们发现最大的等级出现在Nc=7、NfF=22的情况,此时由两种不同表示构成的ρ介子的标度间隔因子为13。对于一般的Nc,通过调节NfF可使等级大于7。我们展示了等级随NfF的变化关系,并研究了其对夸克质量的依赖。这些预测确实依赖于从微扰区对γ的外推——即使在最保守的情形下,也能实现明显的能隙。

英文摘要:

In gauge theories, the running of the anomalous dimension of a fermion bilinear operator is believed to lead to chiral symmetry breaking when gamma=1. Naively using perturbative results to judge when gamma=1 leads to the possibility of large dynamically generated mass hierarchies in models with both two index symmetric representation and fundamental representation fermions. In this paper we study a holographic model of this physics to predict the separation in scales in the meson spectrum. We study SU(Nc) theories at different Nc with one flavour of two index symmetric representation as a function of the number of fundamental fermion flavours NfF. The largest hierarchy we find is for Nc=7 and NfF=22 where the rho mesons made of the two different representations are separated in scale by a factor of 13. For general Nc the hierarchy can be made greater than 7 by tuning NfF. We display the hierarchy as a function of NfF and investigate the quark mass dependence. These predictions do depend on the extrapolation of gamma from the perturbative regime - even in a pessimistic scenario a distinct gap can be achieved.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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