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利用前向 μ 子标记通过矢量玻色子融合在多 TeV μ 子对撞机上探测惰性三重态模型

Probing Inert Triplet Model at a multi-TeV muon collider via vector boson fusion with forward muon tagging

Priyotosh Bandyopadhyay, Snehashis Parashar, Chandrima Sen, Jeonghyeon Song

备注：
Published version
发表信息：
Published in: JHEP 07 (2024) 253 https://link.springer.com/article/10.1007/JHEP07(2024)253
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AI总结：

本文研究多 TeV μ 子对撞机通过 VBF 探测 ITM，利用 DCT 与前向 μ 子克服软衰变产物难题，并证明三个基准点可实现 5σ 发现。

摘要：

本研究考察多 TeV μ 子对撞机（MuC）探测惰性三重态模型（ITM）的潜力；该模型在标准模型中引入一个超荷为 Y=0 的三重态标量场。ITM 是引人关注的超出标准模型情景，包含中性三重态 T^0 和带电三重态 T^±。值得注意的是，T^0 在 Z_2 对称性下为奇宇称，因此被假定为暗物质（DM）候选者。对理论、对撞机和暗物质实验约束的严格评估将三重态标量质量限制在狭窄的 TeV 能区，并在其中确定三个基准点用于对撞机研究，其 T^± 质量分别为 1.21 TeV、1.68 TeV 和 3.86 TeV。ITM 独有的 TTVV 四点顶点不同于费米子暗物质模型，可通过矢量玻色子融合（VBF）促进高效的成对产生。这一特性使 MuC 成为探索 ITM 的理想平台，尤其是高碰撞能量下 VBF 截面会增强。为应对 T^± 与 T^0 之间狭窄质量差导致 T^± 衰变产物较软的挑战，我们提出将来自 T^± 的消失带电径迹（DCT）与前向 μ 子作为关键特征。我们给出 MuC 能量为 6 TeV 和 10 TeV、相应亮度为 4 ab^-1 和 10 ab^-1 时这些特征的事例数。尽管存在束流诱导背景污染信号的挑战，我们仍证明所提出的末态使 MuC 能够对已确定的基准点实现 5σ 发现，其中特别突出了含一条 DCT 和一个前向 μ 子的末态的有效性。

英文摘要：

This study investigates the potential of a multi-TeV Muon Collider (MuC) for probing the Inert Triplet Model (ITM), which introduces a triplet scalar field with hypercharge $Y=0$ to the Standard Model. The ITM stands out as a compelling Beyond the Standard Model scenario, featuring a neutral triplet $T^0$ and charged triplets $T^\pm$. Notably, $T^0$ is posited as a dark matter (DM) candidate, being odd under a $Z_2$ symmetry. Rigorous evaluations against theoretical, collider, and DM experimental constraints corner the triplet scalar mass to a narrow TeV-scale region, within which three benchmark points are identified, with $T^\pm$ masses of 1.21 TeV, 1.68 TeV, and 3.86 TeV, for the collider study. The ITM's unique $TTVV$ four-point vertex, differing from fermionic DM models, facilitates efficient pair production through Vector Boson Fusion (VBF). This characteristic positions the MuC as an ideal platform for exploring the ITM, particularly due to the enhanced VBF cross-sections at high collision energies. To address the challenge of the soft decay products of $T^\pm$ resulting from the narrow mass gap between $T^\pm$ and $T^0$, we propose using Disappearing Charged Tracks (DCTs) from $T^\pm$ and Forward muons as key signatures. We provide event counts for these signatures at MuC energies of 6 TeV and 10 TeV, with respective luminosities of 4 ab$^{-1}$ and 10 ab$^{-1}$. Despite the challenge of beam-induced backgrounds contaminating the signal, we demonstrate that our proposed final states enable the MuC to achieve a $5σ$ discovery for the identified benchmark points, particularly highlighting the effectiveness of the final state with one DCT and one Forward muon.

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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