Theoretical Division, T-2, MS B285, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Phys Rev Lett. 2014 Jun 6;112(22):221803. doi: 10.1103/PhysRevLett.112.221803. Epub 2014 Jun 4.
We reveal a set of novel decay topologies for the 125 GeV Higgs boson in supersymmetry which are initiated by its decay into a pair of neutralinos, and discuss their collider search strategies. This category of exotic Higgs decays is characterized by the collider signature: visible objects+E_{T}, with E_{T} dominantly arising from escaping dark matter particles. Their benchmark arises naturally in the Peccei-Quinn symmetry limit of the minimal supersymmetric standard model singlet extensions, which is typified by the coexistence of three light particles: singletlike scalar h_{1} and pseudoscalar a_{1}, and singlinolike neutralino χ_{1}, all with masses of ≲10 GeV, and the generic suppression of the exotic decays of the 125 GeV Higgs boson h_{2}→h_{1}h_{1}, a_{1}a_{1} and χ_{1}χ_{1}, however. As an illustration, we study the decay topology: h_{2}→χ_{1}χ_{2}, where the binolike χ_{2} decays to h_{1}χ_{1} or a_{1}χ_{1}, and h_{1}/a_{1}→ff[over ¯], with ff[over ¯]=μ^{+}μ^{-}, bb[over ¯]. In the dimuon case (m_{h_{1}/a_{1}}∼1 GeV), a statistical sensitivity of S/sqrt[B]>6σ can be achieved easily at the 8 TeV LHC, assuming σ(pp→Wh_{2})/σ(pp→Wh_{SM})Br(h_{2}→μ^{+}μ^{-}χ_{1}χ_{1})=0.1. In the bb[over ¯] case (m_{h_{1}/a_{1}}∼45 GeV), 600 fb^{-1} data at the 14 TeV LHC can lead to a statistical sensitivity of S/sqrt[B]>5σ, assuming σ(pp→Zh_{2})/σ(pp→Zh_{SM})Br(h_{2}→bb[over ¯]χ_{1}χ_{1})=0.5. These exotic decays open a new avenue for exploring new physics couplings with the 125 GeV Higgs boson at colliders.
我们揭示了一组新颖的 125GeV 希格斯玻色子在超对称中的衰变拓扑结构，这些拓扑结构是由其衰变为一对中性微子引发的，并讨论了它们在对撞机中的搜索策略。这种奇异的希格斯衰变类别具有对撞机特征：可见物体+E_T，其中 E_T 主要来自逃逸的暗物质粒子。它们的基准自然出现在最小超对称标准模型单态扩展的 Peccei-Quinn 对称极限中，其特点是三种轻粒子的共存：类标量粒子 h_1 和赝标量粒子 a_1，以及类中性微子 χ_1，所有粒子的质量都≲10GeV，并且奇异的 125GeV 希格斯玻色子 h_2→h_1h_1、a_1a_1 和 χ_1χ_1 的衰变通常受到抑制。作为说明，我们研究了衰变拓扑结构：h_2→χ_1χ_2，其中类双微子 χ_2 衰变为 h_1χ_1 或 a_1χ_1，h_1/a_1→ff[over ¯]，其中 ff[over ¯]=μ^+μ^-、bb[over ¯]。在双μ子情况下（m_{h_1/a_1}∼1GeV），在 8TeV LHC 上，假设 σ(pp→Wh_2)/σ(pp→Wh_{SM})Br(h_2→μ^{+}μ^{-}χ_1χ_1)=0.1，很容易达到 S/sqrt[B]>6σ的统计灵敏度。在 bb[over ¯]情况下（m_{h_1/a_1}∼45GeV），在 14TeV LHC 上，600fb^{-1}的数据可以导致 S/sqrt[B]>5σ的统计灵敏度，假设 σ(pp→Zh_2)/σ(pp→Zh_{SM})Br(h_2→bb[over ¯]χ_1χ_1)=0.5。这些奇异的衰变为在对撞机中探索与 125GeV 希格斯玻色子的新物理耦合开辟了新途径。
