"Cut flow for resolved signature, TChHH-G and TChiHH models" of "Search for higgsinos decaying to two Higgs bosons and missing transverse momentum in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Results are presented from a search for physics beyond the standard model in proton-proton collisions at $\sqrt{s}=13$ TeV in channels with two Higgs bosons, each decaying via the process H$\to b\overline{b}$, and large missing transverse momentum. The search uses a data sample corresponding to an integrated luminosity of 137 fb$^{-1}$ collected by the CMS experiment at the CERN LHC. The search is motivated by models of supersymmetry that predict the production of neutralinos, the neutral partners of the electroweak gauge and Higgs bosons. The observed event yields in the signal regions are found to be consistent with the standard model background expectations. The results are interpreted using simplified models of supersymmetry. For the electroweak production of nearly degenerate higgsinos, each of whose decay chains yields a neutralino ($\widetilde{\chi}^0_1$) that in turn decays to a massless goldstino and a Higgs boson, $\widetilde{\chi}^0_1$ masses in the range 175 to 1025 GeV are excluded at 95\% confidence level. For the strong production of gluino pairs decaying via a slightly lighter $\widetilde{\chi}^0_2$ to H and a light $\widetilde{\chi}^0_1$, gluino masses below 2330 GeV are excluded.

本研究报道了一项针对超出标准模型（Standard Model）物理信号的搜索结果，该分析基于欧洲核子研究中心（CERN）大型强子对撞机（Large Hadron Collider, LHC）上紧凑型缪子线圈（Compact Muon Solenoid, CMS）实验采集的积分亮度为137 fb⁻¹、质心系碰撞能量$sqrt{s}=13$ TeV的质子-质子碰撞数据。本次搜索选取的信号道包含双希格斯玻色子（Higgs boson）末态：每个希格斯玻色子均通过衰变过程$ ext{H} o boverline{b}$（底夸克与反底夸克对）衰变，且事件伴随大缺失横动量（missing transverse momentum）。本次搜索的理论动机源自超对称（supersymmetry）模型，这类模型预言中性微子（neutralino）——电弱规范玻色子与希格斯玻色子的中性超对称伴子——的产生过程。分析结果显示，所有信号区域（signal region）内观测到的事件产额（event yield）均与标准模型的本底预期相符。研究采用超对称简化模型（simplified supersymmetry model）对上述结果进行诠释：对于近简并希格斯微子（higgsino）的电弱产生（electroweak production）过程，若其衰变链均产生最轻中性伴子$widetilde{chi}^0_1$，且该中性伴子进一步衰变为无质量戈德斯蒂诺（goldstino）与希格斯玻色子，则在95%置信水平（confidence level）下，可排除175 GeV至1025 GeV范围内的$widetilde{chi}^0_1$质量区间；对于通过质量稍轻的$widetilde{chi}^0_2$衰变至希格斯玻色子与最轻中性伴子$widetilde{chi}^0_1$的胶微子（gluino）对强产生（strong production）过程，可排除质量低于2330 GeV的胶微子。