从锻造良好的中性伴子中捕捉火花
Catching sparks from well-forged neutralinos
摘要：
本文提出了一种新的寻找电弱中微子的方法，它是基于丢失横能量的末态、光子和双轻子对$\ell^+\,\ell^- + γ+ \displaystyle{\not} E_T$，电弱规范和希格斯玻色子的超伴子。与传统的电弱子搜索不同，当$m_{\widetildeχ^0_{2,3}} - m_{\widetildeχ^0_1}, m_{\widetildeχ^{\pm}} - m_{\widetildeχ^0_1} > m_Z$时表现最好，我们的搜索倾向于近简并光谱;简并电弱子通常具有更大的光子分支比，并且切割$m_{\ell\ell} \ll m_Z$有效地去除了壳层Z玻色子背景，同时保留了信号。这一功能使我们的技术最适合“脾气好”的情况下，暗物质遗迹丰度实现与$\sim 20 - 70\,\text{GeV}$的电弱子分裂。此外，我们的策略适用于更广泛的场景，其中最轻的中性伴子几乎简并，但仅构成暗物质的次主导成分-我们称之为“良好伪造”的光谱。专注于bino-Higgsino混合物，我们提出了几个基准方案的最佳削减和预期效率。我们发现在14 TeV LHC上经过大约$600\,\text{fb}^{-1}$的光度后，可以发现含有$m_{\widetildeχ^0_{2,3}} \lesssim 190\,\text{GeV}$和$m_{\widetildeχ^0_{2,3}} - m_{\widetildeχ^0_1} \cong 30\,\text{GeV}$的双希格斯诺混合物。具有较轻状态的场景需要较少的数据用于发现，而具有较重状态或较大质量分裂的场景更难从背景中区分出来，并且需要更多的数据。与许多对超对称性的研究不同，电弱子研究是下一次LHC运行的高亮度而不是增加的能量对发现至关重要的一个领域。
英文摘要：
In this paper we present a new search technique for electroweakinos, the superpartners of electroweak gauge and Higgs bosons, based on final states with missing transverse energy, a photon, and a dilepton pair, $\ell^+\,\ell^- + γ+ \displaystyle{\not} E_T$. Unlike traditional electroweakino searches, which perform best when $m_{\widetildeχ^0_{2,3}} - m_{\widetildeχ^0_1}, m_{\widetildeχ^{\pm}} - m_{\widetildeχ^0_1} > m_Z$, our search favors nearly degenerate spectra; degenerate electroweakinos typically have a larger branching ratio to photons, and the cut $m_{\ell\ell} \ll m_Z$ effectively removes on-shell Z boson backgrounds while retaining the signal. This feature makes our technique optimal for `well-tempered' scenarios, where the dark matter relic abundance is achieved with inter-electroweakino splittings of $\sim 20 - 70\,\text{GeV}$. Additionally, our strategy applies to a wider range of scenarios where the lightest neutralinos are almost degenerate, but only make up a subdominant component of the dark matter -- a spectrum we dub `well-forged'. Focusing on bino-Higgsino admixtures, we present optimal cuts and expected efficiencies for several benchmark scenarios. We find bino-Higgsino mixtures with $m_{\widetildeχ^0_{2,3}} \lesssim 190\,\text{GeV}$ and $m_{\widetildeχ^0_{2,3}} - m_{\widetildeχ^0_1} \cong 30\,\text{GeV}$ can be uncovered after roughly $600\,\text{fb}^{-1}$ of luminosity at the 14 TeV LHC. Scenarios with lighter states require less data for discovery, while scenarios with heavier states or larger mass splittings are harder to discriminate from the background and require more data. Unlike many searches for supersymmetry, electroweakino searches are one area where the high luminosity of the next LHC run, rather than the increased energy, is crucial for discovery.
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