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Current searches for the top squark mostly focus on the decay channels of$\tilde{t}_1 \rightarrow t \chi_1^0$ or $\tilde{t}_1 \rightarrow b \chi_1^\pm\rightarrow bW \chi_1^0$, leading to $tt/bbWW+\not\mathrel{E}_T$ final statesfor top squark pair production at the LHC. In supersymmetric scenarios withlight gauginos other than the neutralino lightest supersymmetric particle(LSP), different decay modes of the top squark could be dominant, whichsignificantly weaken the current top squark search limits at the LHC.Additionally, new decay modes offer alternative discovery channels for topsquark searches. In this paper, we study the top squark and bottom squark decayin the Bino-like LSP case with light Wino or Higgsino next-to-LSPs (NLSPs), andidentify cases in which additional decay modes become dominant. We also performa collider analysis for top squark pair production with mixed top squark decayfinal states of $\tilde{t}_1 \to t {\chi}_2^0 \to th {\chi}_1^0$, $\tilde{t}_1\to b {\chi}_1^\pm \to bW {\chi}_1^0 $, leading to the$bbbbjj\ell+\not\mathrel{E}_T$ collider signature. The branching fraction forsuch decay varies between 25\% and 50\% for a top squark mass larger than 500GeV with $M_2=M_1+150$ GeV. At the 14 TeV LHC with 300 ${\rm fb}^{-1}$integrated luminosity, the top squark can be excluded up to about 1040 GeV atthe 95\% C.L., or be discovered up to 940 GeV at 5$\sigma$ significance.

Complex decay chains of top and bottom squarks