Colorful Twisted Top Partners and Partnerium at the LHC

Abstract

In scenarios that stabilize the electroweak scale, the top quark is typically accompanied by partner particles. In this work, we demonstrate how extended stabilizing symmetries can yield scalar or fermionic top partners that transform as ordinary color triplets but carry exotic electric charges. We refer to these scenarios as "hypertwisted" since they involve modifications to hypercharge in the top sector. As proofs of principle, we construct two hypertwisted scenarios: a supersymmetric construction with spin-0 top partners, and a composite Higgs construction with spin-1/2 top partners. In both cases, the top partners are still phenomenologically compatible with the mass range motivated by weak-scale naturalness. The phenomenology of hypertwisted scenarios is diverse, since the lifetimes and decay modes of the top partners are model dependent. The novel coupling structure opens up search channels that do not typically arise in top-partner scenarios, such as pair production of top-plus-jet resonances. Furthermore, hypertwisted top partners are typically sufficiently long lived to form "top-partnerium" bound states that decay predominantly via annihilation, motivating searches for rare narrow resonances with diboson decay modes.

GUT precursors and entwined SUSY: The phenomenology of stable nonsupersymmetric strings

“…One striking observation concerning our resultsundoubtedly connected with the cancellations discussed above-is that e-SUSY, which emerges automatically in our construction, has a structure which bears a strong resemblance to the structures underlying "folded SUSY" [5], "supersymmetry in slow motion" [60], and more recently "hypertwisted SUSY" [61]. Indeed all of these latter symmetries have been proposed in the literature as mechanisms for stabilizing the weak scale in a way that might be hard or impossible to detect at current colliders.…”

Bounds and prospects for stable multiply charged particles at the LHC

“…Mass bounds for scalar and fermion CTTPs of charges −1/3, 2/3, −4/3, 5/3 can be inferred from the plots presented in ref. [4]. In addition, the authors of [32] obtained bounds for colored scalars with charges −7/3, 8/3, −10/3 and of different SU (2) weak representations.…”

“…It is possible that such a particle has exotic and possibly large electric charge; we will refer to this as a multiply-charged heavy stable particle (MCHSP). Within the context of the naturalness problem (see e.g [3]), such MCHSP can cure the quadratic divergence in the Higgs mass parameter; this has recently been realized in the framework of colored twisted top partners (CTTPs) [4]. The CTTP can take the form of a spin-0 or spin-1/2 color-triplet of arbitrary electric charge.…”

“…An important implication of their long lifetime is the presence of a near-threshold, positronium-like bound state. In the top partner case, this is known as the partnerium [4], and we will use this term to denote the bound state in the generic case. The colored particle-antiparticle pair is bound by both a Coulomb-like Quantum Chromodynamics (QCD) potential and by Electromagnetism (EM), with the latter becoming important for large charges.…”

Removing the conspiracy of BSM physics and BSM cosmology

“…Nonsupersymmetric solution for the problem of Higgs mass divergence may be related to the composite nature of Higgs boson [16,17,18,19,20,21]. Then this divergence is cut at the scale, at which Higgs constituents are bound.…”