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arXiv 1005.4409hep-phhep-ex
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LHC长寿命带电Higgs粒子作为标量暗物质的探测器

Long-lived charged Higgs at LHC as a probe of scalar Dark Matter

K. Huitu, K. Kannike, A. Racioppi, M. Raidal

备注：
15 pages, 5 figures
发表信息：
JHEP 1101:010,2011
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摘要：

在约束标量暗物质模型（CSDMM）下，研究了LHC实验中惰性带电Higgs玻色子$H^\pm$的产生和衰变。在CSDMM中，惰性双重态和单重态标量的质谱是从GUT标度的初始条件通过RGE演化来预测的。计算了LHC中$pp\to H^+H^-,\, H^\pm S_i^0$过程的截面，结果表明，对于轻粒子$H^\pm$，第一个过程主要由顶夸克介导的1-圈图控制，在s-通道中有Higgs玻色子.在参数空间的很大一部分中，$H^\pm$是长寿的，因为它们衰变为主要的单线态标量暗物质（DM）和次轻（NL）标量，$H^\pm\to S_{\text{DM, NL}} ff',$被小的单重态-二重态混合角和中等的质量差$ ΔM=M_{H^+}-M_{\text{DM}} .$所抑制。实验上可测量的$H^\pm$的位移顶点衰变到轻子和/或轻子。或喷射和丢失的能量允许人们在巨大的$W^+W^-$背景上发现$H^+H^-$信号。我们提出了在LHC研究这种情况的基准点。然而，如果$H^\pm$是短暂的，则随后的衰变$S_{\text{NL}}\to S_{\text{DM}} f\bar f$必然产生额外的位移顶点，这些位移顶点允许重建完整的$H^\pm$衰变链。

英文摘要：

We study inert charged Higgs boson $H^\pm$ production and decays at LHC experiments in the context of constrained scalar dark matter model (CSDMM). In the CSDMM the inert doublet and singlet scalar's mass spectrum is predicted from the GUT scale initial conditions via RGE evolution. We compute the cross sections of processes $pp\to H^+H^-,\, H^\pm S_i^0$ at the LHC and show that for light $H^\pm$ the first one is dominated by top quark mediated 1-loop diagram with Higgs boson in s-channel. In a significant fraction of the parameter space $H^\pm$ are long-lived because their decays to predominantly singlet scalar dark matter (DM) and next-to-lightest (NL) scalar, $H^\pm\to S_{\text{DM, NL}} ff',$ are suppressed by the small singlet-doublet mixing angle and by the moderate mass difference $ ΔM=M_{H^+}-M_{\text{DM}} .$ The experimentally measurable displaced vertex in $H^\pm$ decays to leptons and/or jets and missing energy allows one to discover the $H^+H^-$ signal over the huge $W^+W^-$ background. We propose benchmark points for studies of this scenario at the LHC. If, however, $H^\pm$ are short-lived, the subsequent decays $S_{\text{NL}}\to S_{\text{DM}} f\bar f$ necessarily produce additional displaced vertices that allow to reconstruct the full $H^\pm$ decay chain.

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