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arXiv 2410.14830hep-ph
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LHC上的II型跷跷板希格斯三重态产生与衰变

Type-II Seesaw Higgs triplet productions and decays at the LHC

Otilia A. Ducu, Ana E. Dumitriu, Adam Jinaru, Romain Kukla, Emmanuel Monnier, Gilbert Moultaka, Alexandra Tudorache, Hanlin Xu

AI总结:

针对II型跷跷板模型非标准希格斯标量态,系统研究其产生衰变道、级联分类与理论参数敏感性,并结合类ATLAS探测器开展LHC前瞻性搜索,首次覆盖中性态情形。

摘要:

II型跷跷板模型为解释马约拉纳中微子质量提供了一种有吸引力的方案。其扩展的希格斯部分如果足够轻,可在大型强子对撞机(LHC)上呈现丰富且独特的现象学特征,同时自动产生一个本质上类似标准模型希格斯粒子的态。已有多项现象学研究聚焦于该模型的标量部分,实验搜索则主要集中在(双)荷电态上。本文对源自该模型$SU(2)_L$二重态和复三重态的所有非标准标量态的主要产生与衰变道开展了详尽研究。我们聚焦于轻子数破缺衰变被抑制的情形——目前针对该情形的实验限制仍较弱,重点揭示了此前文献未强调的理论参数敏感性,以及它们可能给LHC实验搜索带来的不确定性。文中对各类级联衰变及对应的标准模型粒子多重数进行了全面分类。作为示例,我们基于类ATLAS探测器,针对若干基准点开展了LHC前瞻性搜索的详细研究,涵盖荷电态、双荷电态,并首次涉及中性态的产生。

英文摘要:

The Type-II Seesaw Model provides an attractive scenario to account for Majorana-neutrino masses. Its extended Higgs sector, if sufficiently light, can have a rich and distinctive phenomenology at the LHC while yielding automatically an essentially Standard-Model-Higgs-like state. Several phenomenological studies have been devoted to the scalar sector of this model, as well as experimental searches focusing mostly on the (doubly-)charged states. In this paper we present an exhaustive study of the main production and decay channels of all the non-standard scalar states originating from the $SU(2)_L$ doublet and a complex triplet of the model. We stick to scenarios where lepton-number-violating decays are suppressed, for which present experimental limits are still weak, highlighting theoretical parameter sensitivities that were not previously emphasized in the literature and the uncertainties they can induce for the experimental searches at the LHC. A comprehensive classification of the various cascade decays and corresponding Standard Model particle multiplicities is provided. As an illustration, a detailed prospective search study at the LHC with an ATLAS-like detector is carried out on some benchmark points, for charged, doubly-charged, and, for the first time, neutral state productions

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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