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In view of the recent interest in the pMSSM with light third generationsquarks, we consider a hitherto neglected scenario where the lighter bottomsquark ($\widetilde{b}_1$) is the next lightest supersymmetric particle (NLSP)which co-annihilates with the lightest supersymmetric particle (LSP), the darkmatter (DM) candidate. Since the co-annihilation cross section receivescontributions from both electroweak and strong vertices, it is relativelylarge. As a result relatively large NLSP-LSP mass difference (25 - 35 GeV) isconsistent with the PLANCK data. This facilitates the LHC signatures of thisscenario. We consider several variants of the sbottom NLSP scenario with andwithout light stops and delineate the parameter space allowed by the PLANCKdata. We point out several novel signal (e.g., $\widetilde{t}_1 \rightarrow\widetilde{b}_1 W$) which are not viable in the stop NLSP scenario of DMproduction. Finally, we consider gluino ($\widetilde g$) decays in thisscenario and using the current ATLAS data in the jets (with or withoutb-tagging) + $\not \!\! E_T$ channel, obtain new limits in the$m_{\widetilde{b}_1} - m_{\widetilde g}$ mass plane. We find that for$m_{\widetilde{b}_1}$ upto 500 GeV, $m_{\widetilde g} \geq$ 1.1 - 1.2 TeV inthis scenario.

Gluino mass limits with sbottom NLSP in coannihilation scenarios