论文标题
在最终状态下搜索横向动量缺失的超对称性，三个或更多$ b $ -jets在139 fb $^{ - 1} $的质子$ - $ $ - $ proton碰撞时$ \ sqrt {s} = 13 $ tev带ATLAS检测器
Search for supersymmetry in final states with missing transverse momentum and three or more $b$-jets in 139 fb$^{-1}$ of proton$-$proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS detector
论文作者
论文摘要
搜索涉及涉及Gluinos对脱落的对脱壳的产生的超对称性，据报道通过脱壳第三代qu虫进入最轻的中inition（$ \ \ \tildeχ^0_1 $）。 It exploits LHC proton$-$proton collision data at a centre-of-mass energy $\sqrt{s} = 13$ TeV with an integrated luminosity of 139 fb$^{-1}$ collected with the ATLAS detector from 2015 to 2018. The search uses events containing large missing transverse momentum, up to one electron or muon, and several energetic jets, at least three of which must be确定为包含$ b $ - hadrons。使用简单的运动事件选择和基于深神经网络的事件选择。没有发现高于预测背景的显着多余。在涉及Gluinos的一对生产的简化模型中，通过脱壳顶部（底部）蹲下的腐烂，Gluino质量小于2.44 TEV（2.35 TEV），在95％Cl中排除在95％Cl中，对于无质量的$ \tildeχ^0_1 $。 Gluino质量的限制也设置为Gluino衰变的分支比率可变的分支比率的限制，$ b \ bar {b} \tildeχ^0_1 $，$ t \ bar {t} \tildeχ^0_1 $和$ t \ bar {b} b}
A search for supersymmetry involving the pair production of gluinos decaying via off-shell third-generation squarks into the lightest neutralino ($\tildeχ^0_1$) is reported. It exploits LHC proton$-$proton collision data at a centre-of-mass energy $\sqrt{s} = 13$ TeV with an integrated luminosity of 139 fb$^{-1}$ collected with the ATLAS detector from 2015 to 2018. The search uses events containing large missing transverse momentum, up to one electron or muon, and several energetic jets, at least three of which must be identified as containing $b$-hadrons. Both a simple kinematic event selection and an event selection based upon a deep neural-network are used. No significant excess above the predicted background is found. In simplified models involving the pair production of gluinos that decay via off-shell top (bottom) squarks, gluino masses less than 2.44 TeV (2.35 TeV) are excluded at 95% CL for a massless $\tildeχ^0_1$. Limits are also set on the gluino mass in models with variable branching ratios for gluino decays to $b\bar{b}\tildeχ^0_1$, $t\bar{t}\tildeχ^0_1$ and $t\bar{b}\tildeχ^-_1$ / $\bar{t}b\tildeχ^+_1$.
