Di-decay signature of new physics particles at intensity frontier experiments

Abstract

We present a discovery-era strategy for Intensity Frontier experiments based on ``di-decay'' events, in which feebly interacting particles (FIPs) are produced in pairs and then both decay inside the detector. This signature may exist in broad classes of models with FIPs decaying in the same way as minimal ``portal'' particles. The two displaced vertices may allow reconstruction of the pair invariant mass and hence reveal the production channel, information normally inaccessible at these facilities. This, in turn, lets one discriminate between FIP models that share identical decay signatures. As a case study, we consider the model of Higgs-like scalars and show that SHiP, Belle II, and the Downstream@LHCb can each cover wide domains of viable parameter space using di-decays.

9+20 pages. Matches published version

References in corpus (32)

• Collider Probes of Axion-Like Particles
• A taste of dark matter: Flavour constraints on pseudoscalar mediators
• Flavor probes of axion-like particles
• Emerging Jets
• The Present and Future Status of Heavy Neutral Leptons
• Broadening the Higgs Boson with Right-Handed Neutrinos and a Higher Dimension Operator at the Electroweak Scale
• Searches for Long-Lived Particles at the Future FCC-ee
• Cosmological beam dump: constraints on dark scalars mixed with the Higgs boson
• Reinterpreting the ATLAS bounds on heavy neutral leptons in a realistic neutrino oscillation model
• A search for decays of the Higgs boson to invisible particles in events with a top-antitop quark pair or a vector boson in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Dark Higgs Bosons at Colliders
• Spying an invisible Higgs
• Sensitivities to feebly interacting particles: public and unified calculations
• The see-saw portal at future Higgs Factories
• Phenomenology of axion-like particles with universal fermion couplings -- revisited
• The Axion-Higgs Portal
• Search for a long-lived spin-0 mediator in $b\to s$ transitions at the Belle II experiment
• Searches for long-lived dark photons at proton accelerator experiments
• Dark showers from Z-dark Z' mixing
• LHCb potential to discover long-lived new physics particles with lifetimes above 100 ps
• Search for light long-lived neutral particles that decay to collimated pairs of leptons or light hadrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Advancing the phenomenology of GeV-scale axion-like particles
• Search for short- and long-lived axion-like particles in $H\to aa\to 4\gamma$ decays with the ATLAS experiment at the LHC
• Search for the decay of the Higgs boson to a pair of light pseudoscalar bosons in the final state with four bottom quarks in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Design of the Global Reconstruction Logic in the Belle II Level-1 Trigger system
• Distinguishing Dirac from Majorana Heavy Neutrino at Future Lepton Colliders
• Search for new resonances decaying to pairs of merged diphotons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Model-independent search for pair production of new bosons decaying into muons in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Sub-GeV dark matter and multi-decay signatures from dark showers at beam-dump experiments
• A Downstream and vertexing algorithm for Long Lived Particles (LLP) selection at the first High-level trigger (HLT1) of LHCb
• PREFACE: A search for long-lived particles at the Large Hadron Collider
• Finding excesses in model parameter space