发表机构
CERN（欧洲核子研究组织）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
利用ATLAS探测器在13和13.6 TeV的质子-质子碰撞数据中搜索压缩质量谱的$\tau$-slepton、chargino和neutralino产生，结果与标准模型一致，但存在2.1-2.4$\sigma$的偏差，并设置了相应的质量限制。
AI 中文摘要
本文呈现了对$\tau$-slepton（$\tilde{\tau}$）、chargino（$\tilde{\chi}^{\pm}_1$）和neutralino（$\tilde{\chi}^0_2$）产生过程的搜索，这些搜索针对至少含有一个强子衰变$\tau$轻子的事件，目标是压缩质量谱场景。对于chargino和neutralino，考虑了产生$\tau$-slepton或$\tau$-sneutrino的级联衰变。研究了两种最终选择：要求一个强子衰变$\tau$轻子和另一个带电轻子，或两个及以上强子衰变$\tau$轻子。为了增强对压缩质量谱的灵敏度，考虑了具有初态辐射（ISR）喷注的产生模式。这些搜索使用了ATLAS探测器在大型强子对撞机上于2015-2018年期间以质心能量$\sqrt{s} = 13$ TeV记录的140 $\mathrm{fb}^{-1}$质子-质子碰撞数据，以及2022-2023年期间以质心能量$\sqrt{s} = 13.6$ TeV记录的53 $\mathrm{fb}^{-1}$数据。这些搜索对具有轻$\tau$-slepton的压缩质量谱场景提供了灵敏度。结果总体上与标准模型一致，尽管观察到几个局部显著性为$2.1-2.4 \sigma$的偏差。这些偏差削弱了观测到的排除限制。对于直接$\tau$-slepton产生，仅在ISR通道中，对于$\tau$-slepton质量高达$115$ GeV、$\Delta m(\tilde{\tau}, \tilde{\chi}^0_1) = 30$ GeV的情况，在95%置信水平下设置了限制。鉴于观测到的数据，当统计上组合所有考虑的通道时，未对直接$\tau$-slepton产生设置排除限制。对于电弱ino产生，对于$\tilde{\chi}^0_2$质量高达$200$ GeV、$\Delta m(\tilde{\chi}^0_2, \tilde{\chi}^0_1) = 30$ GeV的情况设置了限制。对于纯chargino对产生，在相同的质量分裂下，对chargino质量高达$175$ GeV设置了限制。
英文摘要
Searches for the production of $τ$-sleptons ($\tildeτ$), charginos ($\tildeχ^{\pm}_1$), and neutralinos ($\tildeχ^0_2$) in events with at least one hadronically decaying $τ$-lepton are presented, targeting compressed mass spectra scenarios. For charginos and neutralinos, the cascade decays producing either a $τ$-slepton or a $τ$-sneutrino are considered. Two final selections are studied, requiring either one hadronically decaying $τ$-lepton and one other charged lepton, or two or more hadronically decaying $τ$-leptons. To enhance sensitivity to the compressed mass spectra, production modes with initial-state radiation (ISR) jets are considered. The searches use 140 $\mathrm{fb}^{-1}$ and 53 $\mathrm{fb}^{-1}$ of proton-proton collision data recorded by the ATLAS detector at the Large Hadron Collider during 2015-2018 at a centre-of-mass energy of $\sqrt{s} = 13$ TeV and 2022-2023 at a centre-of-mass energy of $\sqrt{s} = 13.6$ TeV, respectively. The searches provide sensitivity to the compressed mass spectra scenarios with light $τ$-sleptons. The results are generally consistent with the Standard Model, although several deviations with local significances of $2.1-2.4 σ$ are observed. These deviations weaken the observed exclusion limits. For direct $τ$-slepton production, in the ISR channel alone the limits are set for $Δm(\tildeτ, \tildeχ^0_1) = 30$ GeV for $τ$-slepton masses up to $115$ GeV at 95% confidence level. Given the observed data, no exclusion limits are set for direct $τ$-sleptons production when statistically combining all considered channels. For electroweakino production, limits are set for $Δm(\tildeχ^0_2, \tildeχ^0_1) = 30$ GeV for $\tildeχ^0_2$ masses up to $200$ GeV. For pure chargino pair-production, limits are set for chargino masses up to $175$ GeV for the same mass splitting.
Comments77 pages, author list starting at page 60, 12 figures, 26 tables, submitted to JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HMBS-2024-07/
