Prospects of gluino searches in multi-lepton channels in light of the ongoing LHC RUN-III

• Published in: Chinese physics C 2023-10, Vol.47 (10), p.103105
• Main Authors: Mukherjee, Abhi, Niyogi, Saurabh, Poddar, Sujoy, Saha, Jyoti Prasad
• Format: Article
• Language: English
• Subjects: Large Hadron Collider; pMSSM; supersymmetry phenomenology
• ISSN: 1674-1137; 2058-6132
• DOI: 10.1088/1674-1137/ace8f4

This study investigates the prospect of discovering strongly interacting gluinos in different multi-lepton channels with lepton multiplicities greater than or equal to 2 at LHC RUN-III, considering several pMSSM scenarios. The effectiveness of the multivariate analysis (MVA) method with the boosted decision tree (BDT) algorithm is explored to obtain a better significance for different models. Promising results are obtained for the 3-lepton channels, indicating that the use of MVA methods can improve the sensitivity of the search for gluinos at LHC RUN-III. The study probes the multi-lepton signatures arising from gluinos via intermediate eweakinos and sleptons at an early stage of the LHC RUN-III. The heavier eweakinos can give rise to three or four lepton signals, in which the squark hierarchy between the L and R types plays a crucial role. The study considers two sets of benchmark points that satisfy all the collider constraints obtained from the LHC RUN-II data. Moreover, these sets of benchmark points are mostly consistent with WMAP/PLANCK data and the muon ( g -2) constraint. The corresponding results from the MVA technique demonstrate that, even for an integrated luminosity of 270 , the 5 σ discovery prospect of for TeV in the wino type model is promising. The study also presents various other models that may emerge at the early stage of LHC RUN-III. Wino type models in the scenario where left squarks are light and right squarks are heavy exhibit the best prospect of discovering gluinos in multi-lepton channels in the LHC RUN-III experiment. The findings of this study provide crucial insights into the potential discovery of gluinos in multi-lepton channels.