Ultraheavy diquark decaying into vectorlike quarks at the LHC

Abstract

We explore the discovery potential of an ultraheavy $(7-8.5$ TeV) diquark scalar produced in the collisions of two up quarks at the LHC. Assuming that the diquark scalar decays into 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.

Comments: 9 pages, 3 figures. v2: Several new explanatory paragraphs