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• W2803399688 abstract "Supersymmetry with hadronic R-parity violation in which the lightest neutralino decays into three quarks is still weakly constrained. This work aims to further improve the current search for this scenario by the boosted decision tree method with additional information from jet substructure. In particular, we find a deep neural network turns out to perform well in characterizing the neutralino jet substructure. We first construct a Convolutional Neutral Network (CNN) which is capable of tagging the neutralino jet in any signal process by using the idea of jet image. When applied to pure jet samples, such a CNN outperforms the N-subjettiness variable by a factor of a few in tagging efficiency. Moreover, we find the method, which combines the CNN output and jet invariant mass, can perform better and is applicable to a wider range of neutralino mass than the CNN alone. Finally, the ATLAS search for the signal of gluino pair production with subsequent decay $tilde{g} to q q tilde{chi}^0_1 (to q q q)$ is recasted as an application. In contrast to the pure sample, the heavy contamination among jets in this complex final state renders the discriminating powers of the CNN and N-subjettiness similar. By analyzing the jets substructure in events which pass the ATLAS cuts with our CNN method, the exclusion limit on gluino mass can be pushed up by $sim200$ GeV for neutralino mass $sim 100$ GeV." @default.
• W2803399688 created "2018-06-01" @default.
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• W2803399688 date "2018-10-30" @default.
• W2803399688 modified "2023-10-14" @default.
• W2803399688 title "Deep learning for <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>R</mml:mi></mml:math> -parity violating supersymmetry searches at the LHC" @default.
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• W2803399688 doi "https://doi.org/10.1103/physrevd.98.076017" @default.
• W2803399688 hasPublicationYear "2018" @default.
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