arXiv 1503.084722015-03hep-ph

复合共振对EWPT和Higgs双光子衰变率的影响

Composite Resonances effects on EWPT and Higgs diphoton decay rate

A. E. Cárcamo Hernández, Claudio O. Dib, Alfonso R. Zerwekh

备注：: 8 pages, 12 figures. Presented by Antonio Cárcamo at the X SILAFAE, Medellin, Colombia, November 24-28, 2014. To be published in Nuclear and Particle Physics Proceedings. Contribution to the proceedings of the X SILAFAE 2014. Typos fixed

摘要：

在强耦合的电弱对称性破缺的情况下，不同自旋和宇称的重复合粒子可能会出现，并对出现在回路能级的信号产生可观察到的影响。最近在大型强子对撞机上观察到的希格斯粒子到$γγ$的过程就是这样的信号之一。我们研究了新的约束，施加在复合材料模型从$H\to γγ$，连同现有的高精度电弱测试的约束。我们使用一个有效的手征拉格朗日描述有效的理论，包含标准模型的频谱和电弱标度以下的额外的复合材料。考虑到在$Λ= 4πv \sim 3 $ TeV处的有效理论截止值，对于分别从$1.5$ TeV到$1.7$ TeV和从$1.8$ TeV到$1.9$ TeV的矢量和轴向矢量复合物的相当有限的质量范围，可以发现与$T$和$S$参数以及新观察到的$H\to γγ$的一致性，并且仅包括$W^{3}$和$B^{0}$场之间的非标准动力学混合。

英文摘要：

In scenarios of strongly coupled electroweak symmetry breaking, heavy composite particles of different spin and parity may arise and cause observable effects on signals that appear at loop levels. The recently observed process of Higgs to $γγ$ at the LHC is one of such signals. We study the new constraints that are imposed on composite models from $H\to γγ$, together with the existing constraints from the high precision electroweak tests. We use an effective chiral Lagrangian to describe the effective theory that contains the Standard Model spectrum and the extra composites below the electroweak scale. Considering the effective theory cutoff at $Λ= 4πv \sim 3 $ TeV, consistency with the $T$ and $S$ parameters and the newly observed $H\to γγ$ can be found for a rather restricted range of masses of vector and axial-vector composites from $1.5$ TeV to $1.7$ TeV and $1.8$ TeV to $1.9$ TeV, respectively, and only provided a non-standard kinetic mixing between the $W^{3}$ and $B^{0}$ fields is included.

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英文摘要：

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