Color sextet scalars at the CERN Large Hadron Collider

Taking a phenomenological approach, we study a color sextet scalar at the LHC. We focus on the QCD production of a color sextet pair Phi(6)(Phi) over bar (6) through gg fusion and q (q) over bar annihilation. Its unique coupling to (psi) over bar (c)psi allows the color sextet scalar to decay into same-sign diquark states, such as Phi(6) -> tt/tt*. We propose a new reconstruction in the multijet plus same-sign dilepton with missing transverse energy samples (bb + l(+/-)l(+/-) + is not an element of(T) + Nj, N >= 6) to search for on-shell tt (t) over bar(t) over bar final states from sextet scalar pair production. Thanks to the large QCD production, the search covers the sextet mass range up to 1 TeV for 100 fb(-1) integrated luminosity.