2 TeV Walking Technirho at LHC
2 TeV Walking Technirho at LHC
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DOI：
10.1016/j.physletb.2015.09.023
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发表时间：
2015-06
影响因子：
4.4
通讯作者：
Hidenori S. Fukano;M. Kurachi;S. Matsuzaki;Koji Terashi;K. Yamawaki
中科院分区：
文献类型：
--
作者：
Hidenori S. Fukano;M. Kurachi;S. Matsuzaki;Koji Terashi;K. Yamawaki
ATLAS的合作最近报告了在约2TeV的双玻色子通道中与玻色子标记的肥胖双喷流之间的约2.5TeV的全球重要性，这可能意味着标准模型以外的新共振。我们给出了一种可能的解释，即在以单族模型为基准的情况下，行走的彩色技术的同位旋三重态技术矢量介子(ρΠ±，3)。作为在与LHC实验相关的尺度上描述行走技彩的有效理论，我们采用了一个尺度不变的隐藏局部对称性模型，该模型的构造能够容纳技子、技矢量介子和技子，使得该模型尊重行走技色的自发破缺的手征和标度对称性。特别是，在行走的Technicolor中预言的具有(近似)标度对称性的(伪)Nambu-Goldstone玻色子--Technidilaton，已经被证明成功地与125GeV希格斯玻色子相一致。目前对这些技术强子的LHC限制被用来固定技术矢量介子与标准模型费米子和弱规范玻色子的耦合。我们发现，这些技术粒子主要是通过Drell-yan过程产生的，并且主要衰变到双色玻色子，这是目前报道的大约2TeV超额的原因。文中还讨论了2TeV技术与弱电精度试验的一致性以及其他可能的发现途径。
The ATLAS collaboration has recently reported an excess of about 2.5 σ global significance at around 2 TeV in the diboson channel with the boson-tagged fat dijets, which may imply a new resonance beyond the standard model. We provide a possible explanation of the excess as the isospin-triplet technivector mesons (technirhos, denoted as ρ Π±, 3) of the walking technicolor in the case of the one-family model as a benchmark. As the effective theory for the walking technicolor at the scales relevant to the LHC experiment, we take a scale-invariant version of the hidden local symmetry model so constructed as to accommodate technipions, technivector mesons, and the technidilaton in such a way that the model respects spontaneously broken chiral and scale symmetries of the underlying walking technicolor. In particular, the technidilaton, a (pseudo) Nambu–Goldstone boson of the (approximate) scale symmetry predicted in the walking technicolor, has been shown to be successfully identified with the 125 GeV Higgs. Currently available LHC limits on those technihadrons are used to fix the couplings of technivector mesons to the standard-model fermions and weak gauge bosons. We find that the technirhos are mainly produced through the Drell–Yan process and predominantly decay to the dibosons, which accounts for the currently reported excess at around 2 TeV. The consistency with the electroweak precision test and other possible discovery channels of the 2 TeV technirhos are also addressed.