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arXiv 1004.3269hep-ph
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从LHC的μ子对产生中寻找额外的中性规范玻色子

Searching for an Extra Neutral Gauge Boson from Muon Pair Production at LHC

E. Ramirez Barreto, Y. A. Coutinho, J. Sá Borges

摘要:

我们从对$p + p \longrightarrow μ^+ + μ^- + X$的一些分布的分析中寻找额外的中性规范玻色子$ Z^\prime$的签名,在标准模型的一些扩展中预测,其中唯一涉及的奇异粒子是$ Z^\prime$。除了不变的质量和电荷不对称分布,我们建议在我们的搜索中使用横向动量分布($p_T$)作为一个观察。我们对LHC质心能量的两个值(7和14 TeV)进行了计算,对应于1和100 fb $^{-1}$的光度,以便将我们从一些模型中获得的结果与标准模型的分布进行比较。通过在不变质量中应用方便的切割,我们证明了最终粒子的$p_T$分布可以揭示额外的中性规范玻色子贡献的存在。我们还声称,这是可能的解开这里考虑的模型,我们强调,最小版本的模型,基于${SU (3)_C \times SU (3)_L \times U (1)_X}$对称性,提出了更明确的签名为$ Z^\prime$存在。

英文摘要:

We search for signatures of the extra neutral gauge boson $ Z^\prime$, predicted in some extensions of the Standard Model, from the analysis of some distributions for $p + p \longrightarrow μ^+ + μ^- + X$, where the only exotic particle involved is $ Z^\prime$. In addition to the invariant mass and charge asymmetry distributions, we propose in our search to use the transverse momentum distribution ($p_T$) as an observable. We do our calculation for two values of the LHC center of mass energy (7 and 14 TeV), corresponding to 1 and 100 fb$^{-1}$ of luminosity, in order to compare our findings from some models with the distributions following from the Standard Model. By applying convenient cuts in the invariant mass, we show that the final particles $p_T$ distributions can reveal the presence of an extra neutral gauge boson contribution. We also claim that it is possible to disentangle the models considered here and we emphasize that the minimal version of the model, based on ${SU (3)_C \times SU (3)_L \times U (1)_X}$ symmetry, presents the more clear signatures for $ Z^\prime$ existence.

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