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arXiv 1107.1473hep-ph
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Tevatron和LHC中顶层物理中的轻胶子共振现象

Phenomenology of a light gluon resonance in top-physics at Tevatron and LHC

Ezequiel Alvarez, Leandro Da Rold, Juan Ignacio Sanchez Vietto, Alejandro Szynkman

摘要:

我们提出了一个唯象分析的最近Tevatron结果的$t \bar t$的前向后不对称性和不变质量谱假设一个新的贡献从s-通道胶子共振的质量范围从700到2500 GeV。与以前的大多数工作相比,这个分析表明,对于低于~1 TeV的质量,共振新物理学可以容纳实验数据。总的来说,我们发现类轴耦合更适合于光和顶夸克耦合,只有顶夸克与新物理学强烈耦合。我们发现,复合模型的情况下自然产生的实验结果的唯象分析。我们表明,我们的结果是兼容最近的LHC限制在dijet和$t \bar t$生产,并发现一些张力大共振质量~2.5 TeV。我们指出,作为最好的观测值,用于区分一个相对较轻的新胶子在CDF的前向-后向不对称性,以及$t \bar t$电荷不对称性和不变质量谱在大型强子对撞机更好的分辨率。

英文摘要:

We present a phenomenological analysis of the recent Tevatron results on the $t \bar t$ forward-backward asymmetry and invariant-mass spectrum assuming a new contribution from an s-channel gluon resonance with a mass in the range from 700 to 2500 GeV. In contrast to most of the previous works, this analysis shows that for masses below ~1 TeV resonant New Physics could accommodate the experimental data. In general, we find that axial-like couplings are preferred for light and top quark couplings, and that only top quark couples strongly to New Physics. We find that composite model scenarios arise naturally from only phenomenological analyses of the experimental results. We show that our results are compatible with recent LHC limits in dijet and $t \bar t$ production, and find some tension for large resonance mass ~2.5 TeV. We indicate as best observables for discriminating a relatively light new gluon a better resolution in CDF forward-backward asymmetry, as well as the $t \bar t$ charge asymmetry and invariant-mass spectrum at the LHC.

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