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.

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

References in corpus (9)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Vector-like Singlet Quarks: a Roadmap
• Prospects for top-prime quark discovery at the Tevatron
• Search for pair production of vector-like quarks in leptonic final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Search for pair-production of vector-like quarks in lepton+jets final states containing at least one $b$-tagged jet using the Run 2 data from the ATLAS experiment
• Search for resonant and nonresonant production of pairs of dijet resonances in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Pursuit of paired dijet resonances in the Run 2 dataset with ATLAS
• Searches for pair-produced multijet resonances using data scouting in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• A search for R-parity-violating supersymmetry in final states containing many jets in $pp$ collisions at $\sqrt{s}=13\text{TeV}$ with the ATLAS detector

Cited by in corpus (2)

• R-parity violation and 8 TeV four-jet events at the LHC
• Observability of an ultraheavy diquark decaying into vectorlike quarks at the LHC