Search for direct production of bottom and top squark pairs in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$

This note presents a search for direct production of bottom or top squark pairs in proton-proton collisions at a center-of-mass energy of $\sqrt{s}=13~\mathrm{TeV}$ collected by the CMS experiment at the LHC in 2016. The data used correspond to an integrated luminosity of $36~\mathrm{fb}^{-1}$. This search is performed in a final state of two, three, or four jets accompanied by a significant imbalance in the transverse momentum. No statistically significant excess of events is found beyond the expected contribution from standard model processes. Exclusion limits are set in the context of simplified models of bottom- or top-squark pair production. Bottom squarks with masses below $1225~\mathrm{GeV}$ are excluded at $95\%~\mathrm{CL}$ for small values of the neutralino mass. Top squarks with masses below $525~\mathrm{GeV}$ are excluded if the mass difference to the lightest neutralino is close to $10~\mathrm{GeV}$.