385 citations · 2.3k across the 47 of their papers we have counts for
39 papers · 1 filter
Testing Heavy Neutral Leptons in Cosmic Ray Beam Dump experiments
Oliver Fischer, Baibhab Pattnaik, José Zurita
In this work, we discuss the possibility to test Heavy Neutral Leptons (HNLs) using Cosmic Ray Beam Dump experiments. In analogy with terrestrial beam dump experiments, wher…
-mediated Majorana dark matter: suppressed direct-detection rate and complementarity of LHC searches
T. Alanne, F. Bishara, J. Fiaschi +3
We study the direct-detection rate for axial-vectorial dark matter scattering off nuclei in an invariant effective theory and compare it agains…
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…
Robustness of ARS Leptogenesis in Scalar Extensions
Oliver Fischer, Manfred Lindner, Susan van der Woude
Extensions of the Standard Model (SM) with sterile neutrinos are well motivated from the observed oscillations of the light neutrinos and they have shown to successfully explain th…
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…
Displaced Neutrino Jets at the LHeC
Giovanna Cottin, Oliver Fischer, Sanjoy Mandal +2
Extending the Standard Model with right-handed neutrinos (RHNs) is well motivated by the observation of neutrino oscillations. In the type-I seesaw model, the RHNs interact with th…
Avenues to new-physics searches in cosmic ray air showers
Oliver Fischer, Maximilian Reininghaus, Ralf Ulrich
Cosmic Rays (CR) impinging on the terrestrial atmosphere provide a viable opportunity to study new physics in hadron-nucleus collisions at energies covering many orders of magnitud…
Testing the Anomaly at the LHeC
Georges Azuelos, Oliver Fischer, Sudip Jana
B-Physics anomalies have recently raised renewed interest in leptoquarks (LQ), predicted in several theoretical frameworks. Under simplifying but conservative assumptions, we show…
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…
Exotic Higgs decays into displaced jets at the LHeC
Kingman Cheung, Oliver Fischer, Zeren Simon Wang +1
Profiling the Higgs boson requires the study of its non-standard decay modes. In this work we discuss the prospects of the Large Hadron electron Collider (LHeC) to detect scalar pa…
Model Independent Bounds on the Non-Oscillatory Explanations of the MiniBooNE Excess
Vedran Brdar, Oliver Fischer, Alexei Yu. Smirnov
We consider the non-oscillatory explanations of the low energy excess of events detected by MiniBooNE. We present a systematic search for phenomenological scenarios based on new ph…
Explaining the MiniBooNE excess by a decaying sterile neutrino with mass in the 250 MeV range
Oliver Fischer, Alvaro Hernandez-Cabezudo, Thomas Schwetz
The MiniBooNE collaboration has reported an excess of electron-like events (). We propose an explanation of these events in terms of a sterile neutrino decayi…
Searching for Dark Photons at the LHeC and FCC-he
Monica D'Onofrio, Oliver Fischer, Zeren Simon Wang
Extensions of the Standard Model (SM) gauge group with a new predict an additional gauge boson. Through kinetic mixing with the SM photons featured by a coupling , the…
Lepton-Trijet and Displaced Vertex Searches for Heavy Neutrinos at Future Electron-Proton Colliders
Stefan Antusch, Oliver Fischer, A. Hammad
Electron proton (ep) colliders could provide particle collisions at TeV energies with large data rates while maintaining the clean and pile~up-free environment of lepton colliders,…
Closing the light gluino gap with electron-proton colliders
David Curtin, Kaustubh Deshpande, Oliver Fischer +1
The future electron-proton collider proposals, LHeC and FCC-he, can deliver (TeV) center-of-mass energy collisions, higher than most of the proposed lepton accelerator…
Low scale type II seesaw: Present constraints and prospects for displaced vertex searches
Stefan Antusch, Oliver Fischer, A. Hammad +1
The type II seesaw mechanism is an attractive way to generate the observed light neutrino masses. It postulates a SU(2)-triplet scalar field, which develops an induced…
Prospects for Heavy Scalar Searches at the LHeC
Luigi Delle Rose, Oliver Fischer, A. Hammad
In this article we study the prospects of the proposed Large Hadron electron Collider (LHeC) in the search for heavy neutral scalar particles. We consider a minimal model with one…
BSM physics at the LHeC and the FCC-he
Georges Azuelos, Monica D'Onofrio, Oliver Fischer +1
Electron-proton () colliders are an ideal laboratory to study common features of electron and quarks with production via electroweak bosons, leptoquarks, multi-jet final stat…
Long-Lived Particles at the Energy Frontier: The MATHUSLA Physics Case
David Curtin, Marco Drewes, Matthew McCullough +85
We examine the theoretical motivations for long-lived particle (LLP) signals at the LHC in a comprehensive survey of Standard Model (SM) extensions. LLPs are a common prediction of…
Lepton Flavor Violating Dilepton Dijet Signatures from Sterile Neutrinos at Proton Colliders
Stefan Antusch, Eros Cazzato, Oliver Fischer +2
In this article we investigate the prospects of searching for sterile neutrinos in lowscale seesaw scenarios via the lepton flavour violating (but lepton number conserving) dilepto…
Probing BSM physics with electron-proton colliders
David Curtin, Kaustubh Deshpande, Oliver Fischer +1
In this talk I will illustrate with two examples (Higgsino dark matter and Exotic Higgs decays) how electron-proton colliders present unique opportunities to probe BSM scenarios wh…
Probing the Seesaw Mechanism and Leptogenesis with the International Linear Collider
Stefan Antusch, Eros Cazzato, Marco Drewes +4
We investigate the potential of the International Linear Collider (ILC) to probe the mechanisms of neutrino mass generation and leptogenesis within the minimal seesaw model. Our re…
New Physics Opportunities for Long-Lived Particles at Electron-Proton Colliders
David Curtin, Kaustubh Deshpande, Oliver Fischer +1
Future electron-proton collider proposals like the LHeC or the FCC-eh can supply 1/ab of collisions with a center-of-mass energy in the TeV range, while maintaining a clean experim…
Probing Leptogenesis at Future Colliders
Stefan Antusch, Eros Cazzato, Marco Drewes +4
We investigate the question whether leptogenesis, as a mechanism for explaining the baryon asymmetry of the universe, can be tested at future colliders. Focusing on the minimal sce…