New limits on top squark NLSP from ATLAS 4.7 $f{b}^{-1}$ data

Abstract

Using the ATLAS 4.7 $f{b}^{-1}$ data on new physics search in the jets + $\met$ channel, we obtain new limits on the lighter top squark (${\tilde{t}}_1$) considering all its decay modes assuming that it is the next to lightest supersymmetric particle (NLSP). If the decay $\lstop$ $\ra c \lspone$ dominates and the production of dark matter relic density is due to NLSP - LSP co-annihilation then the lower limit on $\mlstop $ is 240 GeV. The limit changes to 200 GeV if the decay $\lstop$ $\ra b W \lspone$ dominates. Combining these results it follows that $\lstop $ NLSP induced baryogenesis is now constrained more tightly.

9 pages, 2 figures, published in MPLA

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• New Physics from the Top at the LHC
• Dark matter signals at the LHC: forecasts from ton-scale direct detection experiments
• Light stop squarks and b-tagging