Fusing vectors into scalars at high energy lepton colliders

Self Cite

We show that a new gauge group with one new scalar leads to automatically stable Dark Matter candidates. We consider theories where the Higgs phase is dual to the confined phase: it is known that SU(2) gauge theories with a scalar doublet (like the Standard Model) obey this non-trivial feature. We provide a general criterion, showing that this self-duality holds for SU(N ), SO(N ), Sp(N ) and G 2 gauge dynamics with a scalar field in the fundamental representation. The resulting Dark Matter phenomenology has non-trivial features that are characteristic of the group, and that we discuss case by case. Just to mention a few, SU(N ) has an accidental conserved dark baryon number, SO(2N + 1) leads to stable glue-balls thanks to a special parity, G 2 leads to a Dark Matter system analogous to neutral kaons. The cosmological Dark Matter abundance is often reproduced for masses around 100 TeV: all constraints are satisfied and lighter dark glueballs can affect Higgs physics. These theories acquire additional interest and predictivity assuming that both the dark and weak scales are dynamically generated.

Section: Dark Glue-ballsmentioning

confidence: 95%

Dark Matter from self-dual gauge/Higgs dynamics

Buttazzo

Luzio

Landini

et al. 2019

Self Cite

“…Vector-like confinement [88] pioneered this study in the context of vector-like fermions that transform under part of the SM group as well as under a new, strongly-coupled group with scales near or above the electroweak scale. Further explorations into the phenomenology and especially the meson sector included [20,38,55,73,[89][90][91][92][93][94][95][96][97]. In theories with somewhat lower confinement scales, the dark sector may lead to dark showers and related phenomena [98][99][100][101][102][103][104], displaced signals [105,106] and potentially intriguing spectroscopy [47,107,108].…”

Section: Introductionmentioning

confidence: 99%

Dark mesons at the LHC

Kribs

Martin

Ostdiek

et al. 2019

A new, strongly-coupled "dark" sector could be accessible to LHC searches now. These dark sectors consist of composites formed from constituents that are charged under the electroweak group and interact with the Higgs, but are neutral under Standard Model color. In these scenarios, the most promising target is the dark meson sector, consisting of dark vector-mesons as well as dark pions. In this paper we study dark meson production and decay at the LHC in theories that preserve a global SU (2) dark flavor symmetry. Dark pions -like the pions of QCD -can be pair-produced through resonant dark vector meson production, pp → ρ D → π D π D , and decay in one of two distinct ways: "gaugephobic", when π D → ff generally dominates; or "gaugephilic", when π D → W + h, Z + h dominates once kinematically open. Unlike QCD, the decay π 0 D → γγ is virtually absent due to the dark flavor symmetry. We recast a vast set of existing LHC searches to determine the current constraints on (and future opportunities for) dark meson production and decay. When m ρ D is slightly heavier than 2m π D and ρ ±,0 D kinetically mixes with the weak gauge bosons, the 8 TeV same-sign lepton search strategy sets the best bound, m π D > 500 GeV. Yet, when only the ρ 0 D kinetically mixes with hypercharge, we find the strongest LHC bound is m π D > 130 GeV, that is only slightly better than what LEP II achieved two decades ago. We find the relative insensitivity of LHC searches, especially at 13 TeV, can be blamed mainly on their penchant for high mass objects or large missing energy. Dedicated searches would undoubtedly yield substantially improved sensitivity. We provide a GitHub page to speed the implementation of these searches in future LHC analyses. Our findings for dark meson production and decay provide a strong motivation for model-independent searches of the form pp → A → B + C → SM SM + SM SM where the theoretical prejudice is for SM to be a 3rd generation quark or lepton, W, Z, or h.

“…We thank Jorge De Blas for correspondence about this point 8. For a recent phenomenological analysis pointing out the advantages of a muon collider see Ref [39]9.…”

mentioning

confidence: 92%

Probing new electroweak states via precision measurements at the LHC and future colliders

Luzio

Gröber

Panico

2019

Several new physics scenarios, motivated e.g. by dark matter, feature new electroweakly charged states where the lightest particle in the multiplet is stable and neutral. In such cases direct searches at LHC are notoriously difficult, while electroweak precision tests both at hadron and lepton colliders offer the possibility to indirectly probe those states. In this work, we assess the sensitivity of the highluminosity phase of the LHC on new electroweak multiplets via the modification of neutral and charged Drell-Yan processes, and compare the reach of future hadron and lepton colliders presently under consideration. *