论文标题
搜索在$ \ sqrt {s} = $ 13 tev的质子proton碰撞中的$μμττ$最终状态中的$μμττ$中搜索轻型伪苏卡的玻色子
Search for a light pseudoscalar Higgs boson in the boosted $μμττ$ final state in proton-proton collisions at $\sqrt{s} =$ 13 TeV
论文作者
论文摘要
使用2016 LHC Proton-Proton碰撞数据在$ \ \ sqrt {s} = $ 13 tev中，搜索从125 GEV（或更重的标量）scriaks boson（A）进行衰减的伪级Higgs Boson（A）搜索搜索。 实验。该分析考虑了H的Gluon Fusion和Vector -Boson融合生产，其次是衰减H $ \ to $ aa $ \至$ $ $ $μμμμττ$，并考虑了伪内的群体，范围为3.6 $ \ lt $ $ $ $ $ $ $ M_ \ MATHRM {a} a} $ $ \ lt $ \ lt $ 21 gev。由于H和A玻色子和A玻色子衰减产物的小质量之间存在巨大质量差，因此$μ$和$ττ$ Pairs均具有较高的Lorentz增强功能，并且是准确的。 $ττ$重建效率通过修改HADRONIC $τ$ Lepton Decay重建的标准技术来提高，以解释附近的MUON。未观察到明显的信号。 h $ \ to $ \ aa $ \ to $ \ aa $ \ to $ \ aa $ \ to $ aa $ \ to $ aa $ \ to $ $ \ $ $ $μμμτ$，将单独的限制设置为95％的置信度，作为$ m_ \ mathrm {a} $的函数，在分支分数（$ \ natercal {b} $）上（300）GEV。 $ \ Mathcal {B} $（H $ \ to $ aa）的模型依赖性限制设置在两个Higgs Doubleets加上SINGLET模型的上下文中，对于类型III模型，获得了最严格的结果。这些结果扩展了当前的LHC搜索较重的A玻色子，该玻色子腐烂以解决Lepton对，并为H玻色子提供了第一个此类界限，其质量高于125 GEV。
A search for a light pseudoscalar Higgs boson (a) decaying from the 125 GeV (or a heavier) scalar Higgs boson (H) is performed using the 2016 LHC proton-proton collision data at $\sqrt{s} =$ 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$, collected by the CMS experiment. The analysis considers gluon fusion and vector boson fusion production of the H, followed by the decay H $\to$ aa $\to$ $μμττ$, and considers pseudoscalar masses in the range 3.6 $\lt$ $m_\mathrm{a}$ $\lt$ 21 GeV. Because of the large mass difference between the H and the a bosons and the small masses of the a boson decay products, both the $μμ$ and the $ττ$ pairs have high Lorentz boost and are collimated. The $ττ$ reconstruction efficiency is increased by modifying the standard technique for hadronic $τ$ lepton decay reconstruction to account for a nearby muon. No significant signal is observed. Model-independent limits are set at 95% confidence level, as a function of $m_\mathrm{a}$, on the branching fraction ($\mathcal{B}$) for H $\to$ aa $\to$ $μμττ$, down to 1.5 (2.0) $\times$ 10$^{-4}$ for $m_\mathrm{H} =$ 125 (300) GeV. Model-dependent limits on $\mathcal{B}$(H $\to$ aa) are set within the context of two Higgs doublets plus singlet models, with the most stringent results obtained for Type-III models. These results extend current LHC searches for heavier a bosons that decay to resolved lepton pairs and provide the first such bounds for an H boson with a mass above 125 GeV.
