AI 中文总结
基于LHC对ηt的观测，通过两种fηt情形估算ηt→W+W−衰变分支比及双轻子事件数，提议利用ηt→W+W−→ℓ−ν¯ℓℓ′+νℓ′通道寻找ηt，为其性质研究提供互补且灵敏的探测方式。
AI 中文摘要
受大型强子对撞机（LHC）近期对赝标量顶夸克偶素ηt的观测以及对其性质持续研究兴趣的推动，我们从现象学角度研究了ηt→W+W−过程，这是顶夸克偶素ηt的特征衰变之一。通过两种衰变常数fηt的情形估算了ηt→W+W−衰变的分支比。研究发现，考虑带电轻子现实的识别效率并假设未来高亮度大型强子对撞机有超过3×10^7个ηt事件时，可通过级联衰变ηt→W+W−→ℓ−ν¯ℓℓ′+νℓ′（ℓ,ℓ′=e,μ）实验观测到数十个双轻子事件。我们提议通过ηt→W+W−→ℓ−ν¯ℓℓ′+νℓ′通道寻找ηt，该通道无b喷注且有清晰双轻子特征，是一种互补且可能更灵敏的探测方式。
英文摘要
Motivated by the recent observation of the pseudoscalar toponium $η_{t}$ at the LHC and by the ongoing interest in its properties, we phenomenologically investigate the $η_{t}$ ${\to}$ $W^{+}W^{-}$ process, one of the characteristic decays of toponium $η_{t}$. The branching ratio for the $η_{t}$ ${\to}$ $W^{+}W^{-}$ decay is estimated with two scenarios of the decay constant $f_{η_{t}}$. It is found that tens of dilepton events from the cascade decays, $η_{t}$ ${\to}$ $W^{+}W^{-}$ ${\to}$ ${\ell}^{-}\barν_{\ell}{\ell}^{{\prime}+}ν_{{\ell}^{\prime}}$ with ${\ell}$, ${\ell}^{\prime}$ $=$ $e$ and $μ$, could be experimentally observed, when considering the realistic identification efficiency of the charged lepton and assuming more than $3{\times}10^{7}$ $η_{t}$ events available at the future HL-LHC. We propose searching for $η_{t}$ via the $η_{t}$ ${\to}$ $W^{+}W^{-}$ ${\to}$ ${\ell}^{-}\barν_{\ell}{\ell}^{{\prime}+}ν_{{\ell}^{\prime}}$ channel, which features no $b$-jets and clean dilepton signatures, thus offering a complementary and potentially more sensitive probe.
Comments20 pages
Journal refEur. Phys. J. C 86, 882 (2026)
DOI：10.1140/epjc/s10052-026-16112-1
