Search potential for ${\tilde{b}}_1\to tW{\tilde{\chi }}_1^0$ via ${\tilde{\chi }}_1^{\pm }$ at the LHC and HL-LHC, with multi-lepton signatures

Abstract

The search potential for sbottom pair production in an R-parity conserving scenario is explored in multi-lepton final states at LHC Run-3 and the HL-LHC. In this model, the sbottom decays via a chargino, ${\tilde{b}}_1\to t{\tilde{\chi }}_1^{\pm }$, with a branching ratio (BR) of 100%. The chargino subsequently decays into a $W$ boson and the lightest neutralino, ${\tilde{\chi }}_1^{\pm }\to W{\tilde{\chi }}_1^0$, also with a BR of 100%. Two mass configurations are considered for ${\tilde{\chi }}_1^0$: a fixed value of 50 GeV, and a scenario where ${\tilde{\chi }}_1^{\pm }$ is 100 GeV heavier than ${\tilde{\chi }}_1^0$. The study follows the ATLAS object definitions and event selection criteria as detailed in Refs.1-3, extending the analysis presented in Ref. 2. Results are presented as projected exclusion limits in the ${\tilde{b}}_1$-${\tilde{\chi }}_1^0$ and ${\tilde{b}}_1$-${\tilde{\chi }}_1^{\pm }$ mass planes for three center-of-mass energies (13 TeV, 13.6 TeV, and 14 TeV) and three integrated luminosity scenarios (139 fb${}^{-1}$, 300 fb${}^{-1}$, and 3000 fb${}^{-1}$). Depending on the ${\tilde{\chi }}_1^0$ mass assumption, sbottom masses up to 1.28 TeV can be excluded at the HL-LHC with 3000 fb${}^{-1}$. These projections highlight the impact of alternative mass configurations on the sensitivity of multi-lepton \sbsbModel searches and provide guidance for future strategies targeting challenging SUSY scenarios at the LHC.

Comments: 20 pages, 11 figures