[论文解读] Beyond the Standard Model Physics at the HL-LHC and HE-LHC

X. Cid Vidal, M. D’Onofrio+295 more|arXiv (Cornell University)|Dec 19, 2018

Particle physics theoretical and experimental studies被引用 47

一句话总结

本报告在 HL-LHC（14 TeV，3 ab^-1）和 HE-LHC（27 TeV，15 ab^-1）范围内，对包括 SUSY、暗物质、长寿命粒子、跳跃子、无菌中微子、类轴子样粒子以及重共振在内的广泛模型，进行了潜在发现或对其进行约束的评估。

ABSTRACT

This is the third out of five chapters of the final report [1] of the Workshop on Physics at HL-LHC, and perspectives on HE-LHC [2]. It is devoted to the study of the potential, in the search for Beyond the Standard Model (BSM) physics, of the High Luminosity (HL) phase of the LHC, defined as $3~\mathrm{ab}^{-1}$ of data taken at a centre-of-mass energy of $14~\mathrm{TeV}$, and of a possible future upgrade, the High Energy (HE) LHC, defined as $15~\mathrm{ab}^{-1}$ of data at a centre-of-mass energy of $27~\mathrm{TeV}$. We consider a large variety of new physics models, both in a simplified model fashion and in a more model-dependent one. A long list of contributions from the theory and experimental (ATLAS, CMS, LHCb) communities have been collected and merged together to give a complete, wide, and consistent view of future prospects for BSM physics at the considered colliders. On top of the usual standard candles, such as supersymmetric simplified models and resonances, considered for the evaluation of future collider potentials, this report contains results on dark matter and dark sectors, long lived particles, leptoquarks, sterile neutrinos, axion-like particles, heavy scalars, vector-like quarks, and more. Particular attention is placed, especially in the study of the HL-LHC prospects, to the detector upgrades, the assessment of the future systematic uncertainties, and new experimental techniques. The general conclusion is that the HL-LHC, on top of allowing to extend the present LHC mass and coupling reach by $20-50\%$ on most new physics scenarios, will also be able to constrain, and potentially discover, new physics that is presently unconstrained. Moreover, compared to the HL-LHC, the reach in most observables will generally more than double at the HE-LHC, which may represent a good candidate future facility for a final test of TeV-scale new physics.

研究动机与目标

• 评估在 HL-LHC 与 HE-LHC 的广泛超越标准模型场景的潜在探测范围。
• 分析用于未来新物理探索的探测器升级、系统误差以及新的实验技术。
• 提供对超对称性、暗物质、长寿命粒子、味物理和共振信号的协调预测。

提出的方法

• 使用详细的探测器性能研究与快速模拟相结合的方法，在 HL-LHC 条件下预测对象重建。
• 将模拟事件与事件生成器和部分夸克喷淋相接口，以估计在各种搜索通道中的信号和背景。
• 根据截面和升级后的探测器性能应用尺度因子，将当前分析外推到 HL-LHC/HE-LHC。
• 纳入由当前分析和大型数据集的预计改进指导的系统不确定性考量。
• 在一个统一框架内总结结果，覆盖 SUSY、暗物质/暗部、 LLPs、味物理和共振。

实验结果

研究问题

• RQ1 HL-LHC 与 HE-LHC 的GLuino及第三代下落子的潜在探测范围是多少？
• RQ2 升级后的探测器与更高的 luminosity 如何影响对电弱粒子、睡眠粒子和压缩光谱的灵敏度？
• RQ3 在 HL-LHC/HE-LHC 下，暗物质和暗分域信号（包括单喷 jet、重味物理和希格斯门户情形）的前景如何？
• RQ4 通过置换顶点、消失轨道或重稳定带电粒子等方式发现长寿命粒子的潜力如何？
• RQ5 HL-LHC/HE-LHC 的预测如何在各种模型中约束高质量质量共振和新的规范玻色子？

主要发现

• HL-LHC 的前景在许多新的物理场景中将当前质量与耦合的探索范围扩大大约 20-50%。
• 与 HL-LHC 相比，HE-LHC 对大多数量测量实现的前景通常翻倍以上，提升对 TeV 量级新物理的敏感性。
• 该研究强调探测器升级、系统不确定性处理以及新颖分析技术对提升新物理灵敏度的重要性。
• 覆盖了广泛的 BSM 签名，包括 SUSY 顶部伙伴、电弱粒子、 sleptons、暗物质通道、 LLPs、跳跃子和重共振。
• 结果凸显在当前未被约束的模型中潜在的发现或强约束。