Theta in new QCD-like sectors

Abstract

New QCD-like `hypercolor' sectors can generate a broad class of new signatures at hadron colliders and furnish a variety of dark matter candidates. Paired diboson resonances are a particularly important collider signature, arising both from $CP$-conserving vector hypermeson decays of the form $\tilde{\rho }\to \tilde{\pi }\tilde{\pi }\to 4V$ and from $CP$-violating pseudoscalar hypermeson decays of the form $\tilde{\eta }\to \tilde{\pi }\tilde{\pi }\to 4V$. The latter are sensitive to the vacuum angle $\tilde{\theta }$ in the hypercolor sector. We study single- and paired-diboson resonance signatures in final states involving gluons and photons at the LHC and a future 100 TeV $pp$ collider, illustrating the discovery potential at both colliders in simple benchmark models. We also describe some of the theoretical and cosmological consequences of $\tilde{\theta }$. If $CP$-violating hypermeson decays are observable at hadron colliders, ordinary QCD must have an axion. Such scenarios also provide a natural setting for a dark pion component of dark matter, with its relic abundance set by $CP$-violating annihilations. If the new vacuum angle is relaxed to zero by a dark axion, the relic density can instead be a mixture of axions and dark axions. Overproduction of dark axions is most easily avoided if the universe underwent a period of early matter domination.

33 pages + appendices, 18 figures

References in corpus (43)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• DELPHES 3, A modular framework for fast simulation of a generic collider experiment
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• String Axiverse
• Axions In String Theory
• An Improved Experimental Limit on the Electric Dipole Moment of the Neutron
• In Wino Veritas? Indirect Searches Shed Light on Neutralino Dark Matter
• Search for new phenomena in dijet events using 37 fb${}^{-1}$ of $pp$ collision data collected at $\sqrt{s}=$13 TeV with the ATLAS detector
• Wino Dark Matter Under Siege
• Anomalous solutions to the strong CP problem
• Search for new phenomena in high-mass diphoton final states using 37 fb${}^{-1}$ of proton-proton collisions collected at $\sqrt{s}=13$ TeV with the ATLAS detector
• Cosmological Implications of Dark Matter Bound States
• Factoring the Strong CP Problem
• Vectorlike Confinement at the LHC
• Cosmology and Accelerator Tests of Strongly Interacting Dark Matter
• Search for high-mass diphoton resonances in proton-proton collisions at 13 TeV and combination with 8 TeV search
• Search for pair-produced resonances decaying to jet pairs in proton-proton collisions at sqrt(s) = 8 TeV
• Weakly Interacting Stable Pions
• Supersymmetry, Axions and Cosmology
• Constraining CP-violating Higgs Sectors at the LHC using gluon fusion
• Effects of theta on the deuteron binding energy and the triple-alpha process
• A search for pair-produced resonances in four-jet final states at $\sqrt{s}$ =13 TeV with the ATLAS detector
• Shedding Light on Diphoton Resonances
• Colored Resonances at the Tevatron: Phenomenology and Discovery Potential in Multijets
• Searching for Multijet Resonances at the LHC
• The LHC Phenomenology of Vectorlike Confinement
• Hadronically decaying color-adjoint scalars at the LHC
• Composite Octet Searches with Jet Substructure
• Confronting the Moduli-Induced LSP Problem
• Strong CP and SUZ${}_2$
• Topological Pions
• Di-jet resonances at future hadron colliders: A Snowmass whitepaper
• Collider Tests of the Renormalizable Coloron Model
• Diphotons, New Vacuum Angles, and Strong CP
• A Tale of Two Timescales: Mixing, Mass Generation, and Phase Transitions in the Early Universe
• Moduli or Not
• Some Remarks on Anthropic Approaches to the Strong CP Problem
• Search for new phenomena in high-mass final states with a photon and a jet from $pp$ collisions at $\sqrt{s}$ = 13 TeV with the ATLAS detector
• Color-octet Companions of a 750 GeV Heavy Pion
• Search for excited states of light and heavy flavor quarks in the $\gamma$+jet final state in proton-proton collisions at $\sqrt{s}=$ 13 TeV
• A possible anthropic solution to the Strong CP problem

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• Probing the Early Universe with Axion Physics and Gravitational Waves
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• Dark Matter Targets for Axion-like Particle Searches
• Dark Mesons at the LHC
• The future search for low-frequency axions and new physics with the FLASH resonant cavity experiment at Frascati National Laboratories
• The QCD Axion and Gravitational Waves in light of NANOGrav results
• Glueball Dark Matter revisited
• Indirect Signs of the Peccei-Quinn Mechanism
• Effective Theories of Dark Mesons with Custodial Symmetry
• Composite Dark Matter with Forbidden Annihilation
• Glueball dark matter, precisely
• Hexapod Coloron at the LHC
• Composite heavy axion-like dark matter
• Uncovering an Axion Mechanism with the EDM Portfolio