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arXiv 1601.05079hep-ph
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用三轻子检验2- TeV共振

Testing the 2-TeV Resonance with Trileptons

Arindam Das, Natsumi Nagata, Nobuchika Okada

摘要:

CMS合作组在研究SU(2)$_R$规范玻色子通过右手中微子衰变到双电子加双喷流($eejj$)终态时报告了2.8个$σ$过剩。如果SU(2)$_R$带电规范玻色子$W_R^\pm$的质量约为2 TeV,而质量为${\cal O}(1)$ TeV的右手中微子主要衰变为电子,则可以解释这一现象。然而,在CMS $eejj$搜寻中缺乏同号电子事件,这对将右手中微子解释为马约拉纳费米子提出了挑战。考虑到这种情况,本文考虑了用赝狄拉克中微子的$SU(2)_L\otimes SU(2)_R\otimes U(1)_{B-L}$规范理论解释CMS $eejj$过剩的可能性.我们发现,CMS过剩事件和ATLAS双玻色子异常实际上可以在这个框架中解释,而不与目前的实验界限相冲突。一般来说,这种设置允许在带电规范玻色子和中微子扇区中进行相当大的左右混合,这使我们能够通过LHC的三轻子加丢失能量搜索来探测这个模型。事实证明,在我们的模型中预测的该通道中的事件数量与CMS合作观察到的事件数量非常一致。我们还讨论了在LHC Run-II实验中测试该模型的前景。

英文摘要:

The CMS collaboration has reported a 2.8$σ$ excess in the search of the SU(2)$_R$ gauge bosons decaying through right-handed neutrinos into the two electron plus two jets ($eejj$) final states. This can be explained if the SU(2)$_R$ charged gauge bosons $W_R^\pm$ have a mass of around 2 TeV and a right-handed neutrino with a mass of ${\cal O}(1)$ TeV mainly decays to electron. Indeed, recent results in several other experiments, especially that from the ATLAS diboson resonance search, also indicate signatures of such a 2 TeV gauge boson. However, a lack of the same-sign electron events in the CMS $eejj$ search challenges the interpretation of the right-handed neutrino as a Majorana fermion. Taking this situation into account, in this paper, we consider a possibility of explaining the CMS $eejj$ excess based on the $SU(2)_L\otimes SU(2)_R\otimes U(1)_{B-L}$ gauge theory with pseudo-Dirac neutrinos. We find that both the CMS excess events and the ATLAS diboson anomaly can actually be explained in this framework without conflicting with the current experimental bounds. This setup in general allows sizable left-right mixing in both the charged gauge boson and neutrino sectors, which enables us to probe this model through the trilepton plus missing-energy search at the LHC. It turns out that the number of events in this channel predicted in our model is in good agreement with that observed by the CMS collaboration. We also discuss prospects for testing this model at the LHC Run-II experiments.

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