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arXiv 2602.09095hep-phhep-ex
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FCC-ee上长寿命左右对称信号

Long-lived Left-Right signals at the FCC-ee

Sorbonne Université & CNRS(索邦大学与法国国家科学研究中心);Jožef Stefan Institute(约瑟夫斯蒂芬研究所);Faculty of Mathematics and Physics, University of Ljubljana(卢布尔雅那大学数学物理学院);Dipartimento di Scienze Fisiche e Chimiche, Università dell’Aquila(阿奎拉大学物理化学科学系);INFN, Laboratori Nazionali del Gran Sasso(意大利国家核物理研究所格兰萨索国家实验室)

Benjamin Fuks, Jonathan Kriewald, Miha Nemevšek, Fabrizio Nesti

AI总结:

研究FCC-ee对撞机在左右对称模型中长寿命信号的产生机制和探测能力

摘要:

我们对未来电子-正电子对撞机在不同 proposed 能量下重Majorana中微子产生位移信号进行了详尽讨论,背景是左右对称模型。考虑了广泛的通道,从那些通过W和W_R介导到那些由标量混合和规范/标量玻色子融合诱导的,与中微子质量起源机制有关。出现的信号特征可能有多个位移重中微子,在某些情况下伴有即时活动和前向轻子。我们推导出相应的总产生率和微分分布,这使我们能够区分通道并得到信号产量的解析估计。然后我们利用专用的顶点算法开发了现实的选取效率估计,该算法确定位移衰变位置并提供可靠代理以重建长寿命粒子的完整四动量。这使得能够确定左右对称模型参数空间在各通道中的现实可达性,并展示这些可以明显超越LHC的,证明未来轻子对撞机对左右对称破缺尺度在深多TeV范围敏感。

英文摘要:

We give an extensive discussion of the displaced signals of heavy Majorana neutrino production at future electron-positron colliders operating at various proposed energies in the context of the Left-Right symmetric model. A comprehensive collection of channels is taken into account, ranging from those featuring $W$ and $W_R$ mediation to those induced by scalar mixing and gauge/scalar boson fusion, with connections to the mechanism of neutrino mass origin. The emerging signatures feature possibly multiple displaced heavy neutrinos that are in some cases accompanied by prompt activity and forward leptons. We derive the corresponding total production rates and differential distributions, which allow us to differentiate the channels and have analytical estimates of the signal yield. We then develop realistic estimates of the selection efficiencies using a dedicated vertexing algorithm which establishes the displaced decay positions and supplies a reliable proxy for reconstructing the full four-momenta of long-lived particles. This allows to determine the realistic reaches in the parameter space of the Left-Right symmetric model across the various channels, and we show that these can strongly surpass the LHC ones, demonstrating that future lepton colliders are sensitive to left-right symmetry breaking scales in the deep multi-TeV regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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