LHC probes of the 10 TeV scale

TL;DR

This paper explores how the LHC could detect ultraheavy diquark particles up to 10 TeV, significantly extending the search range for new particles beyond the usual TeV scale by analyzing high-energy final states and decay channels.

Contribution

It demonstrates the potential for discovering ultraheavy diquarks at the LHC through various decay channels and final states, including cascade decays and exotic signatures involving top quarks and Higgs bosons.

Findings

Diquarks up to 10 TeV could produce detectable events at the 14 TeV LHC.

Multiple decay channels provide distinctive signatures for detection.

Heavy diquarks can decay into various particles, leading to high-energy final states.

Abstract

The usual range of new particle masses, up to a few TeV, searched for at the LHC may be substantially extended if ultraheavy diquark particles exist. A diquark scalar, $S_{uu}$, that interacts perturbatively with two up quarks may be as heavy as 10 TeV and would still produce tens of spectacular events at the 14 TeV LHC. It is shown here that an ultraheavy $S_{uu}$ could be discovered through final states of very high energy in various channels, especially if the diquark can decay into other new heavy particles. Examples include cascade decays of $S_{uu}$ via a second scalar produced in pairs, which leads to two dijet resonances, or to more exotic signals with top quarks, Higgs bosons, electroweak bosons, and high-$p_T$ jets. Another possibility is that the diquark decays into a vectorlike quark of multi-TeV mass and a top or up quark. Signal events include one or two highly boosted top quarks and a Higgs boson or a $Z$, without counterparts containing top antiquarks. Similarly, direct decays of the diquark into $tj$ or $tt$ with leptonic top decays involve only positively charged leptons.