标题： 全息模型中的行走技术冠军 显示英文标题

标题： Walking Technipions in a Holographic Model

摘要： 我们基于一个全息模型计算了在行走技术色模型中，奇异维度 gamma_m =1 的技术介子质量，该模型自然地将技术希格斯粒子 phi 作为复合希格斯，其质量 m_phi 约为 125 GeV。 在一族模型（包含4个弱双态）中，以具体例子为例，在这种框架中，输入值为 F_pi=v/2 约为 123 GeV，m_phi 约为 125 GeV 以及 gamma_m=1。 结果表明，由于大的奇异维度，技术介子质量被增强到典型 O(1) TeV。 我们发现技术介子质量与 S^{（TC）}存在相关性，S 参数仅来自技术色模型部分。 因此，目前的 LHC 数据对技术介子质量的限制使 S^{（TC）}不会大到 O(1)，从而对技术色模型构建给出了直接约束。 这是对技术色模型本身的全新约束，与其他通过扩展技术色相互作用连接的领域无关，这与来自精密电弱测量的传统 S 参数约束形成鲜明对比。 显示英文摘要

摘要： We calculate masses of the technipions in the walking technicolor model with the anomalous dimension gamma_m =1, based on a holographic model which has a naturally light technidilaton phi as a composite Higgs with mass m_phi simeq 125 GeV. The one-family model (with 4 weak-doublets) is taken as a concrete example in such a framework, with the inputs being F_pi=v/2 simeq 123 GeV and m_phi simeq 125 GeV as well as gamma_m=1. It is shown that technipion masses are enhanced by the large anomalous dimension to typically O(1) TeV. We find a correlation between the technipion masses and S^{(TC)}, the S parameter arising only from the technicolor sector. The current LHC data on the technipion mass limit thus constrains S^{(TC)} to be not as large as O(1), giving a direct constraint on the technicolor model building. This is a new constraint on the technicolor sector alone quite independent of other sector connected by the extended-technicolor-type interactions, in sharp contrast to the conventional S parameter constraint from the precision electroweak measurements.