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arXiv 2202.03258hep-phhep-ex
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在HL-LHC从Higgsino衰变中增强Higgs对的产生

Enhanced Higgs pair production from higgsino decay at the HL-LHC

Jianpeng Dai, Tao Liu, Daohan Wang, Jin Min Yang

摘要:

多扇区超对称性破缺的情况下,预测的伪goldstino,不被引力子吸收,其质量可以低至${{\cal O} (0.1)}$ GeV。由于赝goldstino的相互作用不像引力子那么弱,在LHC的探测器中,产生的希格斯玻色子可以衰变为赝goldstino加Higgs玻色子,因此希格斯玻色子对的产生会导致Higgs对信号加上丢失的能量。对于需要较轻Higgsinos的自然超对称情形,这类事件的数量可能大大超过SM预测的Higgs对事件,并且在HL-LHC(14 TeV,亮度3~ $\rm{ab}^{-1}$)上是可以观测到的。在这项工作中,我们研究了这种希格斯对的可观测性,加上在HL-LHC产生的光希格斯玻色子衰变中丢失的能量。考虑Higgs对衰变的三个通道($bbWW^*$,$bbγγ$,$bbbb$),我们对信号和背景进行了详细的蒙特卡罗模拟,结果表明,最佳通道是$bbbb+\textrm{E\!\!\!\! \!\slash}_T$,其统计显著性可以达到当前实验允许的轻Higgsino的$2σ$水平。这超过了SM希格斯对的结果,它大约是$1.8σ$。

英文摘要:

The scenario of multi-sector SUSY breaking predicts pseudo-goldstinos which are not absorbed by the gravitino and their mass can be as low as ${{\cal O} (0.1)}$ GeV. Since the interactions of pseudo-goldstinos are not so weak as gravitino, a produced higgsino can decay to a pseudo-goldstino plus a Higgs boson insider the detector at the LHC, and thus the higgsino pair production can lead to the signal of Higgs pair plus missing energy. For the scenario of natural SUSY which requires rather light higgsinos, such events may sizably outnumber the Higgs pair events predicted by the SM and be accessible at the HL-LHC (14 TeV with a luminosity of 3~$\rm{ab}^{-1}$). In this work we examine the observability of such Higgs pair plus missing energy from the decay of light higgsinos produced at the HL-LHC. Considering three channels of the Higgs-pair decay ($bbWW^*$, $bbγγ$, $bbbb$), our detailed Monte Carlo simulations for the signal and backgrounds show that the best channel is $bbbb+\textrm{E\!\!\!\! \!\slash}_T$, whose statistical significance can reach $2σ$ level for a light higgsino allowed by current experiments. This is over the SM Higgs pair result which is about $1.8σ$.

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