在LHC上观测超重双夸克衰变成向像夸克的可观测性

在LHC上衰变为矢量样夸克的超重双夸克

Ultraheavy diquark decaying into vectorlike quarks at the LHC

本文研究LHC上质量7-8.5 TeV的超重双夸克标量经矢量样夸克衰变到全强子六喷注末态的发现潜力，利用机器学习判别器实现信号与背景分离，表明在3000 fb^-1亮度下耦合低至0.2时仍可发现或排除该粒子。

高能轻子对撞机对超重$S_{uu}$二夸克在$uχ$通道的灵敏度

HL-LHC sensitivity to an ultraheavy $S_{uu}$ diquark in the $uχ$ channel

研究HL-LHC对超重$S_{uu}$二夸克在$uχ$通道的灵敏度，通过机器学习判别器分析四喷注拓扑，提升对超重二夸克的探测能力。

Ultraheavy resonances at the LHC: beyond the QCD background

We study the theory and some experimental hints of ultraheavy resonances at the LHC. The production of an ultraheavy narrow particle may have a larger rate than the QCD background even when the final state includes only hadronic jets. We consider two classes of models that lead to 4-jet signals. In the first class a diquark scalar decays into two vectorlike quarks. In the second one a coloron decays into two color-octet scalars or into a pair of vectorlike quarks. We show that a diquark as heavy as 11.5 TeV, or a coloron as heavy as 8.5 TeV may be discovered at the LHC. We point out that a CMS…

LHC probes of the 10 TeV scale

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,…

Vectorlike Confinement at the LHC

We argue for the plausibility of a broad class of vectorlike confining gauge theories at the TeV scale which interact with the Standard Model predominantly via gauge interactions. These theories have a rich phenomenology at the LHC if confinement occurs at the TeV scale, while ensuring negligible impact on precision electroweak and flavor observables. Spin-1 bound states can be resonantly produced via their mixing with Standard Model gauge bosons. The resonances promptly decay to pseudo-Goldstone bosons, some of which promptly decay to a pair of Standard Model gauge bosons, while others are ch…

Gauge Baryon Number and Dibaryonic Dark Matter

The minimal standard model of quarks and leptons is extended with a set of vectorlike fermions to allow baryon number $B$ to become a gauged $U(1)_B$ symmetry. The $B$ assignments of the new particles are determined by renormalizable interactions with the known quarks through a color triplet scalar diquark. The spontaneous breaking of $U(1)_B$ by a scalar with $B=3$ results in a conserved residual global $B$ symmetry. A singlet neutral scalar with $B=2$ is a possible long-lived dark-matter candidate.