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arXiv 1608.08458hep-ph
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LHeC上的奇特希格斯衰变$h\rightarrowϕϕ\rightarrow 4b$

Exotic Higgs Decay $h\rightarrowϕϕ\rightarrow 4b$ at the LHeC

Shang Liu, Yi-Lei Tang, Chen Zhang, Shou-hua Zhu

摘要:

我们研究了125 GeV的希格斯玻色子($h$)的奇异衰变为一对自旋为0的轻粒子($ϕ$),随后衰变并导致$4b$的最终状态。这种衰变模式在次最小超对称标准模型(NMSSM)和扩展的希格斯扇区模型中得到了很好的解释。而不是在大型强子对撞机(LHC)和高亮度大型强子对撞机(HL-LHC),这是由大型标准模型(SM)背景的困扰搜索,我们调查这个衰变通道在更干净的大型强子电子对撞机(LHeC)。通过一些简单的选择切割,这个通道在这个$ep$机器上变得几乎没有背景,与(HL-)LHC的情况形成鲜明对比。部分子水平分析表明,对于$ϕ$质量范围$[20,60]GeV$,与$100\,fb^{-1}$光度的LHeC通常能够约束$C_{4b}^2\equivκ_{V}^2\times\text{Br}(h\rightarrowϕϕ)\times\text{Br}^2(ϕ\rightarrow b\bar{b})$($κ_{V}$表示相对于SM值的$hVV(V=W,Z)$耦合强度)到百分之几的水平($95\%$ CL)。使用$1\,ab^{-1}$,可以探测到几个千分之一级别的亮度$C_{4b}^2$。这些灵敏度比HL-LHC的性能好得多,并证明了LHeC在探测外来希格斯衰变过程中所发挥的重要作用,除了已经提出的不可见的希格斯衰变通道。

英文摘要:

We study the exotic decay of the 125 GeV Higgs boson ($h$) into a pair of light spin-0 particles ($ϕ$) which subsequently decays and results in a $4b$ final state. This decay mode is well motivated in the Next to Minimal Supersymmetric Standard Model (NMSSM) and extended Higgs sector models. Instead of searching at the Large Hadron Collider (LHC) and the High Luminosity Large Hadron Collider (HL-LHC) which are beset by large Standard Model (SM) backgrounds, we investigate this decay channel at the much cleaner Large Hadron Electron Collider (LHeC). With some simple selection cuts this channel becomes nearly free of background at this $ep$ machine, in stark contrast with the situation at the (HL-)LHC. With a parton level analysis we show that for the $ϕ$ mass range $[20,60]GeV$, with $100\,fb^{-1}$ luminosity the LHeC is generally capable of constraining $C_{4b}^2\equivκ_{V}^2\times\text{Br}(h\rightarrowϕϕ)\times\text{Br}^2(ϕ\rightarrow b\bar{b})$ ($κ_{V}$ denotes the $hVV(V=W,Z)$ coupling strength relative to the SM value) to a few percent level ($95\%$ CLs). With $1\,ab^{-1}$ luminosity $C_{4b}^2$ at a few per mille level can be probed. These sensitivities are much better than the HL-LHC performance and demonstrate the important role expected to be played by the LHeC in probing exotic Higgs decay processes, in addition to the already proposed invisible Higgs decay channel.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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