Search for pair production of third generation leptoquarks in the $\tau\tau b \bar{b}$ final state with the D0 detector

We report the the search for the third generation leptoquarks in $p\bar{p}$ collisions at a center-of-mass energy of $\sqrt{s} = 1.96$ TeV using data with an integrated luminosity of 982 pb$^{-1}$ collected by the D0 dectector at Run II of the Fermilab Tevatron. Leptoquarks are assumed to be pair produced and each decays into a $\tau$ lepton and a b quark with a branching ratio $\beta=100\% $. The signature is a di-$\tau$ plus di-b-jet final state where one $\tau$ is required to decay into a $\mu$ and the other $\tau$ decays hadronically. No evidence for third generation leptoquarks production is observed, and limits are set on $\sigma(p\bar{p}\rightarrow{\mathrm LQ3} \overline{\mathrm LQ3}\rightarrow\tau^+ b\tau^- \bar{b}$.