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arXiv 1011.0872hep-phhep-ex
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Z '_{ B-L }发现潜力在LHC为\sqrt{s} =7 TeV

Z'_{B-L} discovery potential at the LHC for \sqrt{s}=7 TeV

Lorenzo Basso, Alexander Belyaev, Stefano Moretti, Giovanni Marco Pruna, Claire H. Shepherd-Themistocleous

备注：
Talk given at 35th International Conference of High Energy Physics (ICHEP 2010), July 22-28, 2010, Paris, France
发表信息：
PoS ICHEP2010:381,2010
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摘要：

在考虑Z '_{B-L} \rightarrow e^+e^-和Z'_{B-L} \rightarrow μ^+μ^-衰变通道的情况下，给出了在U（1）_{B-L}扩大的标准模型Z'扇区中发现3个重Majorana中微子的可能性.在较小的Z '_{B-L}玻色子质量下，电子比μ子对较小的耦合具有更高的灵敏度。在\sqrt{s} =7 TeV的LHC上运行，假设最多\int \mathcal{L} \sim 1 fb^{-1}，将能够给出与不久将在低质量区的Tevatron上得到的结果相似的结果，并将它们扩展到更重的M_{Z'}。在LHC（Tevatron）上，5σ发现可能高达M_{Z'} =1.2（0.9）TeV，而在LHC上，2σ排除可能高达M_{Z'} =1.6 TeV。对于M_{Z'} =600 GeV，在LHC和Tevatron上，新的规范耦合g '_1在5σ处可以探测到\sim（3 <$4）\cdot 10 ^{-2}（含电子）和\sim（4 <$5）\cdot 10^{-2}（含μ子）。这个模型中的Z'玻色子在大型强子对撞机上表现出了新的特征，作为多轻子和多喷流通过重中微子衰变，这使得人们可以测量所涉及的重中微子质量。最后，同时测量重中微子质量和衰变长度（在参数空间的大范围内，重中微子是相当长寿命的粒子）可以估计母轻中微子的绝对质量。

英文摘要：

We present the Large Hadron Collider (LHC) discovery potential in the Z' sector of a U(1)_{B-L} enlarged Standard Model also encompassing three heavy Majorana neutrinos, for \sqrt{s}=7 centre-of-mass energy, considering both the Z'_{B-L}\rightarrow e^+e^- and Z'_{B-L}\rightarrow μ^+μ^- decay channels. Electrons provide a higher sensitivity to smaller couplings at small Z'_{B-L} boson masses than do muons. The run of the LHC at \sqrt{s}=7 TeV, assuming at most \int \mathcal{L} \sim 1 fb^{-1}, will be able to give similar results to those that will be available soon at the Tevatron in the lower mass region, and to extend them for a heavier M_{Z'}. A 5σdiscovery could be possible up to M_{Z'}=1.2(0.9) TeV at the LHC(Tevatron), while a 2σexclusion at the LHC could be possible up to M_{Z'}=1.6 TeV. The new gauge coupling g'_1 can been probed, at 5σ, down to \sim (3 ÷4) \cdot 10^{-2} with electrons and down to \sim (4 ÷5) \cdot 10^{-2} with muons, both at the LHC and at the Tevatron, for M_{Z'}=600 GeV. The Z' boson in this model exhibits novel signatures at the LHC, as multi-lepton and multi-jet decays via heavy neutrinos, that allow one to measure the heavy neutrino masses involved. Lastly, the simultaneous measurement of both the heavy neutrino mass and decay length (over a large region of parameter space, the heavy neutrinos are rather long-lived particles) enables an estimate of the absolute mass of the parent light neutrino.

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