Ultraheavy diquark decaying into vectorlike quarks at the LHC

Abstract: We explore the discovery potential of ultraheavy $(7-8.5$ TeV) diquark scalars $(S_{uu})$ produced in the collision of two up quarks at the LHC. Assuming that the diquark scalar decays in two vectorlike quarks of mass around 2 TeV, each of them decaying into a $W^{+}$ boson and a $b$ quark, we focus on the fully hadronic final state. We present a signal-from-background separation study based on a discriminator built with Machine Learning techniques. For this six-jet final state and a luminosity of $3000 \ \text{fb}^{-1}$, we estimate that a diquark scalar of mass near 8 TeV may be discovered or ruled out even when its coupling to up quarks is as low as 0.2.