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arXiv 1809.01683hep-ph
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用MATHUSLA探测长寿命粒子的三体衰变势

Potential for probing three-body decays of Long-Lived Particles with MATHUSLA

Alejandro Ibarra, Emiliano Molinaro, Stefan Vogl

摘要:

标准模型的几个扩展预测了长寿命中性粒子(LLNP)的存在,其质量在多GeV范围内,衰变长度为O(100 m)或更长。这些粒子可以在LHC中大量产生,但衰变产物不能用ATLAS或CMS探测器探测到。MATHUSLA是一种安装在ATLAS或CMS附近的大体积表面探测器,旨在探测LLNP的场景,这为解开两体衰变到可见粒子的物理基础提供了良好的前景。在这项工作中,我们专注于LLNP衰变成三个粒子,其中一个是不可见的,这与低尺度超对称性破缺,弱相互作用的暗物质或无菌中微子等场景有关。我们分析了MathusLA前景来区分两体和三体LLNP衰变,以及重建基础模型参数的前景。

英文摘要:

Several extensions of the Standard Model predict the existence of Long-Lived Neutral Particles (LLNPs) with masses in the multi-GeV range and decay lengths of O(100 m) or longer. These particles could be copiously produced at the LHC, but the decay products cannot be detected with the ATLAS or CMS detectors. MATHUSLA is a proposed large-volume surface detector installed near ATLAS or CMS aimed to probe scenarios with LLNPs which offers good prospects for disentangling the physics underlying two-body decays into visible particles. In this work we focus on LLNP decays into three particles with one of them being invisible, which are relevant for scenarios with low scale supersymmetry breaking, feebly interacting dark matter or sterile neutrinos, among others. We analyze the MATHUSLA prospects to discriminate between two- and three-body LLNP decays, as well as the prospects for reconstructing the underlying model parameters.

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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