论文标题

在LHC上测试标量三重态解决方案到CDF的脂肪$ W $问题

Testing the Scalar Triplet Solution to CDF's Fat $W$ Problem at the LHC

论文作者

Butterworth, Jon, Heeck, Julian, Jeon, Si Hyun, Mattelaer, Olivier, Ruiz, Richard

论文摘要

II型SeeSAW模型仍然是中微子质量和混合角度的流行且可行的解释。通过假设在弱量规相互作用下的标量的存在,该模型可以预测中微子振荡参数之间的强相关性,Lepton风味实验的信号和高能的对撞机可观测器。我们调查了II型Seesaw可以自然可以通过CDF协作进行最新测量的报告,CDF协作发现$ W $ Boson的质量明显大于Electroweak Precision数据所允许的大量测量,同时从直接搜索中避免了限制。长期以来,对II型Seesaw中此参数空间的实验性审查已长期逃避,因为它的特征是coolliders的``金通道''的特征,而是由级联衰减,中等的质量分裂和许多柔软的最终状态。在这项工作中,我们对大型强子对撞机进行的公开释放的测量值测试了此参数空间。通过使用新开发的工具链结合Madgraph5 \ _amc@nlo和Contur,我们发现,这种差异的大多数偏爱空间已经被标准模型最终状态的测量所排除在外。我们在正在进行的LHC III上提供了进一步探索的建议。

The Type II Seesaw model remains a popular and viable explanation of neutrino masses and mixing angles. By hypothesizing the existence of a scalar that is a triplet under the weak gauge interaction, the model predicts strong correlations among neutrino oscillation parameters, signals at lepton flavor experiments, and collider observables at high energies. We investigate reports that the Type II Seesaw can naturally accommodate recent measurements by the CDF collaboration, which finds the mass of the $W$ boson to be significantly larger than allowed by electroweak precision data, while simultaneously evading constraints from direct searches. Experimental scrutiny of this parameter space in the Type II Seesaw has long been evaded since it is not characterized by ``golden channels'' at colliders but instead by cascade decays, moderate mass splittings, and many soft final states. In this work, we test this parameter space against publicly released measurements made at the Large Hadron Collider. By employing a newly developed tool chain combining MadGraph5\_aMC@NLO and Contur, we find that most of the favored space for this discrepancy is already excluded by measurements of Standard Model final states. We give suggestions for further exploration at Run III of the LHC, which is now underway.

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