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arXiv 1201.3764hep-ph
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LHC激发态双电荷重轻子的唯象

Phenomenology of excited doubly charged heavy leptons at LHC

S. Biondini, O. Panella, G. Pancheri, Y. N. Srivastava, L. Fanò

摘要:

我们考虑电荷为Q=+2e的奇异复合轻子在LHC上的产生。在包含扩展的同位旋多重态(Iw=1和Iw=3/2)的复合模型中,这种态是允许的。这些双电荷轻子通过规范相互作用与标准模型[SM]费米子耦合,从而描绘和限制它们可能的衰变通道。我们讨论了L++在LHC上的产生截面(p p--> L++,l-),并集中于从级联衰变L++-> W+,l+ -> l+,l+,v_l(即p p--> l-,l+,l+,v_l表明类号双轻子的不变质量分布有一个对应于激发轻子质量m* 的尖锐端点。我们发现,当L=10 fb^-1(L=20 fb^-1)时,sqrt{s}=7 TeV的辐射在3-sigma(5-sigma)水平上对600 GeV量级的质量是敏感的。对于L=20 fb^-1(L=60 fb^-1),sqrt{s}=14 TeV的运行可以达到3-sigma(5-sigma)级别的灵敏度,最高可达m*=1 TeV。

英文摘要:

We consider the production at the LHC of exotic composite leptons of charge Q=+2e. Such states are allowed in composite models which contain extended isospin multiplets (Iw=1 and Iw=3/2). These doubly charged leptons couple with Standard Model [SM] fermions via gauge interactions, thereby delineating and restricting their possible decay channels. We discuss the production cross section at the LHC of L++ (p p --> L++, l-) and concentrate on the leptonic signature deriving from the cascade decays L++ --> W+, l+ --> l+, l+, ν_l i.e. p p --> l-, l+, l+, ν_l showing that the invariant mass distribution of the like-sign dilepton has a sharp end point corresponding to excited lepton mass m*. We find that the sqrt{s}=7 TeV run is sensitive at the 3-sigma (5-sigma) level to a mass of the order of 600 GeV if L=10 fb^-1 (L=20 fb^-1). The sqrt{s}=14 TeV run can reach a sensitivity at 3-sigma (5-sigma) level up to m*=1 TeV for L=20 fb^-1 (L=60 fb^-1).

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