AI 中文总结
ATLAS实验利用13 TeV质子-质子碰撞数据，在矢量玻色子散射含τ轻子末态中搜索重马约拉纳中微子，未发现超出标准模型的显著偏差，推导并提升了相关耦合的约束，拓展了排除质量范围。
AI 中文摘要
本文提出在大型强子对撞机（LHC）的矢量玻色子散射过程中，对与第三代轻子耦合的重马约拉纳中微子展开搜索。该搜索采用质子-质子碰撞数据，碰撞质心系能量√s=13 TeV，由ATLAS探测器记录，对应积分亮度为140 fb⁻¹，末态为同号ττ、eτ或μτ对。研究未观测到超出标准模型本底的显著偏差，针对质量在92 GeV至6.5 TeV区间的重马约拉纳中微子，推导了τ轻子与该重中微子之间平方混合矩阵元（|V_τN|²）的约束，同时设定了（|V_eN|², |V_τN|²）和（|V_μN|², |V_τN|²）的二维约束。这些结果提升了重马约拉纳中微子在质量高于1.0 TeV时的耦合限制，并将排除范围拓展至此前未探索的1.5 TeV以上质量区间。
英文摘要
A search for heavy Majorana neutrinos coupling to third-generation leptons in vector boson scattering at the LHC is presented. The search is performed in the final state with a same-sign $ττ$, $eτ$ or $μτ$ pair using data of proton--proton collisions at $\sqrt{s}$ = 13 TeV, recorded with the ATLAS detector and corresponding to an integrated luminosity of 140 $\text{fb}^{-1}$. No significant deviation from the Standard Model background is observed. Constraints on the squared mixing matrix element between the $τ$-lepton and the heavy Majorana neutrino ($|V_{τN}|^2$) are derived for heavy Majorana neutrino masses between 92 GeV and 6.5 TeV. Additionally, two-dimensional constraints on ($|V_{eN}|^{2}, |V_{τN}|^{2}$) and ($|V_{μN}|^{2}, |V_{τN}|^{2}$) are set. These results improve the limits on heavy Majorana neutrinos coupling to third-generation leptons for heavy Majorana neutrino masses above 1.0 TeV, and extend the exclusion limits to an unexplored mass range above 1.5 TeV.
Comments32 pages in total, author list starting page 16, 4 figures, 1 table, submitted to PRL. All figures including auxiliary figures are available at: https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/EXOT-2025-05/
