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 + $\text{met}$ 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 $\text{lstop}$ $\text{ra}c\text{lspone}$ dominates and the production of dark matter relic density is due to NLSP - LSP co-annihilation then the lower limit on $\text{mlstop}$ is 240 GeV. The limit changes to 200 GeV if the decay $\text{lstop}$ $\text{ra}bW\text{lspone}$ dominates. Combining these results it follows that $\text{lstop}$ NLSP induced baryogenesis is now constrained more tightly.

Comments: 9 pages, 2 figures, published in MPLA