498 citations · 10.6k across the 168 of their papers we have counts for
140 papers · 1 filter
Lepton number violation at hadron colliders via pseudo-Dirac heavy neutral leptons
Stefan Antusch, Jan Hajer, Bruno M. S. Oliveira
Symmetry-protected low-scale seesaw models can account for the observed neutrino flavour oscillations without fine-tuning, while yielding collider-accessible signatures through pse…
Gravity-assisted neutrino masses
Stefan Antusch, Salvador Centelles Chuliá, Miguel Levy
Gravity is generally expected to violate global symmetries, including lepton number. However, neutrino masses from the Planck-suppressed Weinberg operator are typically too small t…
Discovering heavy neutrino-antineutrino oscillations at the -pole
Stefan Antusch, Jan Hajer, Bruno M. S. Oliveira
Collider-testable type I seesaw extensions of the Standard Model are generally protected by an approximate lepton number (LN) symmetry. Consequently, they predict pseudo-Dirac heav…
Explaining PTA Results by Metastable Cosmic Strings from SO(10) GUT
Stefan Antusch, Kevin Hinze, Shaikh Saad
In a recent paper (see https://doi.org/10.1103/PhysRevD.108.095053), we have demonstrated that the 2023 PTA results, which hint at a stochastic gravitational wave (GW) background a…
Cosmic Strings from Tribrid Inflation
Stefan Antusch, Katarina Trailović
Tribrid inflation is a class of supersymmetric inflation models where the scalar component of a matter superfield, or a -flat direction of matter fields, drives inflation. Simil…
Probing SUSY at Gravitational Wave Observatories
Stefan Antusch, Kevin Hinze, Shaikh Saad +1
Under the assumption that the recent pulsar timing array evidence for a stochastic gravitational wave (GW) background at nanohertz frequencies is generated by metastable cosmic str…
U(2) is Right for Leptons and Left for Quarks
Stefan Antusch, Admir Greljo, Ben A. Stefanek +1
We posit that the distinct patterns observed in fermion masses and mixings are due to a minimally broken flavor symmetry acting on left-handed quarks and righ…
A Generalised Missing Partner Mechanism for SU(5) GUT Inflation
Stefan Antusch, Kevin Hinze, Shaikh Saad +1
We generalise the Missing Partner Mechanism to split the electron-like states from the coloured ones of vectorlike SU(5) 10-plets without fine-tuning. Together with the extra light…
Heavy neutrino-antineutrino oscillations at the FCC-ee
Stefan Antusch, Jan Hajer, Bruno M. S. Oliveira
We discuss the impact of heavy neutrino-antineutrino oscillations (NNOs) on heavy neutral lepton (HNL) searches at proposed electron-positron colliders such as the future circular…
Minimal GUTs with vectorlike fermions
Stefan Antusch, Kevin Hinze, Shaikh Saad
In this work, we attempt to answer the question, "What is the minimal viable renormalizable GUT with representations no higher than adjoints?". We find that an mode…
Singling out SO(10) GUT models using recent PTA results
Stefan Antusch, Kevin Hinze, Shaikh Saad +1
In this work, we construct promising model building routes towards SO(10) GUT inflation and examine their ability to explain the recent PTA results hinting at a stochastic gravitat…
Decoherence effects on lepton number violation from heavy neutrino-antineutrino oscillations
Stefan Antusch, Jan Hajer, Johannes Rosskopp
We study decoherence effects and phase corrections in heavy neutrino-antineutrino oscillations (NNOs), based on quantum field theory with external wave packets. Decoherence damps t…
Quark-lepton Yukawa ratios and nucleon decay in SU(5) GUTs with type-III seesaw
Stefan Antusch, Kevin Hinze, Shaikh Saad
We consider an extension of the Georgi-Glashow SU(5) GUT model by a 45-dimensional scalar and a 24-dimensional fermionic representation, where the latter leads to the generation of…
Fully Testable Axion Dark Matter within a Minimal GUT
Stefan Antusch, Ilja Doršner, Kevin Hinze +1
We present a minimal Grand Unified Theory model, based on gauge symmetry and a global Peccei-Quinn symmetry, that predicts the existence of an ultralight axion dark…
Beyond lepton number violation at the HL-LHC: Resolving heavy neutrino-antineutrino oscillations
Stefan Antusch, Jan Hajer, Johannes Rosskopp
Collider testable low-scale seesaw models predict pseudo-Dirac heavy neutrinos, that can produce an oscillating pattern of lepton number conserving and lepton number violating even…
Simulating lepton number violation induced by heavy neutrino-antineutrino oscillations at colliders
Stefan Antusch, Jan Hajer, Johannes Rosskopp
We study pseudo-Dirac pairs of two almost mass-degenerate sterile Majorana neutrinos which generate light neutrino masses via a low-scale seesaw mechanism. These pseudo-Dirac heavy…
Implications of the Zero 1-3 Flavour Mixing Hypothesis: Predictions for and
Stefan Antusch, Kevin Hinze, Shaikh Saad
We revisit mixing sum rule relations in the lepton and quark sectors under the assumption that the 1-3 elements of the flavour mixing matrices () are zero…
Viable quark-lepton Yukawa ratios and nucleon decay predictions in GUTs with type-II seesaw
Stefan Antusch, Kevin Hinze, Shaikh Saad
We investigate the viability of predictive schemes for quark-lepton Yukawa ratios and nucleon decay in non-supersymmetric SU(5) Grand Unified Theories (GUTs) where neutrino masses…
Explaining excesses in four-leptons at the LHC with a double peak from a CP violating Two Higgs Doublet Model
Stefan Antusch, Oliver Fischer, A. Hammad +1
Extended scalar sectors with additional degrees of freedom appear in many scenarios beyond the Standard Model. Heavy scalar resonances that interact with the neutral current could…
Unveiling Hidden Physics at the LHC
Oliver Fischer, Bruce Mellado, Stefan Antusch +30
The field of particle physics is at the crossroads. The discovery of a Higgs-like boson completed the Standard Model (SM), but the lacking observation of convincing resonances Beyo…
Nucleon decay in a minimal non-SUSY GUT with predicted quark-lepton Yukawa ratios
Stefan Antusch, Kevin Hinze
We investigate the predictions for various nucleon decay rates and their ratios in non-supersymmetric SU(5) Grand Unified Theories (GUTs) where the masses of the third and second f…
Heavy Neutrino-Antineutrino Oscillations in Quantum Field Theory
Stefan Antusch, Johannes Rosskopp
It has been proposed that the coherent propagation of long-lived heavy neutrino mass eigenstates can lead to an oscillating rate of lepton number conserving (LNC) and violating (LN…
Employing nucleon decay as a fingerprint of SUSY GUT models using \texttt{SusyTCProton}
Stefan Antusch, Christian Hohl, Vasja Susič
While the observation of nucleon decay would be a smoking gun of Grand Unified Theories (GUTs) in general, the ratios between the decay rates of the various channels carry rich inf…
Testing CP Properties of Extra Higgs States at the HL-LHC
Stefan Antusch, Oliver Fischer, A. Hammad +1
Extra Higgs states appear in various scenarios beyond the current Standard Model of elementary particles. If discovered at the LHC or future colliders, the question will arise whet…