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Vacuum instability and false vacuum decay induced by domain walls in the N2HDM Open
The next-to-two-Higgs-doublet model (N2HDM) has a rich vacuum structure where multiple electroweak (EW) breaking minima, as well as CP and electric-charge breaking minima, can coexist. These minima can be deeper than the electroweak vacuum…
Vacuum Instability and False Vacuum Decay Induced by Domain Walls in the N2HDM Open
The Next-to-Two-Higgs-Doublet model (N2HDM) has a rich vacuum structure where multiple electroweak (EW) breaking minima, as well as CP and electric-charge breaking minima, can coexist. These minima can be deeper than the electroweak vacuum…
Electroweak symmetry restoration in the N2HDM via domain walls Open
A bstract Domain walls are a type of topological defect that can arise in the early universe after the spontaneous breaking of a discrete symmetry. They can form in several beyond the Standard Model theories with an extended Higgs sector s…
View article: Updated baseline design for HALHF: the hybrid, asymmetric, linear Higgs factory
Updated baseline design for HALHF: the hybrid, asymmetric, linear Higgs factory Open
Particle physicists aim to construct a electron-positron Higgs factory as the next major particle collider. However, the high associated costs motivate the development of more affordable collider designs. Plasma-wakefield acceleration is a…
Phenomenology of the dark matter sector in the 2HDM extended with complex scalar singlet Open
The two-Higgs-doublet model augmented with a complex scalar singlet (2HDMS) is a well-motivated candidate for Beyond Standard Model (BSM) Physics. We investigate the dark matter phenomenology of the 2HDMS with the complex scalar singlet as…
R&D for positron sources at high-energy lepton colliders Open
Positron Sources for high luminosity high-energy colliders are a challenge for all future lepton colliders as, for instance, the International Linear Collider (ILC) as well as new concepts as the HALHF collider design. In the talk new R$\&…
View article: A High-Flux Electron Detector System to Measure Non-linear Compton Scattering at LUXE
A High-Flux Electron Detector System to Measure Non-linear Compton Scattering at LUXE Open
Recently, advancements in high-intensity laser technology have enabled the exploration of non-perturbative Quantum Electrodynamics (QED) in strong-field regimes. Notable aspects include non-linear Compton scattering and Breit-Wheeler pair …
Electroweak Symmetry Restoration in Extended Higgs Sectors via Domain Walls Open
Domain walls are a type of topological defects that can arise in the early universe after the spontaneous breaking of a discrete symmetry. This occurs in several beyond Standard Model theories with an extended Higgs sector such as the Next…
Dark matter phenomenology in 2HDMS in light of the 95 GeV excess Open
The Two Higgs Doublet model extended with a complex scalar singlet (2HDMS) is a well-motivated Beyond Standard Model candidate addressing several open problems of nature. In this work, we focus on the dark matter (DM) phenomenology of the …
View article: Compton transmission polarimetry of laser-plasma accelerated electron beams
Compton transmission polarimetry of laser-plasma accelerated electron beams Open
Polarised particle beams are indispensable for the study of spin-dependent processes . The LEAP (Laser Electron Acceleration with Polarisation) project at DESY aims to demonstrate the acceleration of polarised electrons in the extremely hi…
Electroweak Symmetry Restoration in the N2HDM via Domain Walls Open
Domain walls are a type of topological defects that can arise in the early universe after the spontaneous breaking of a discrete symmetry. They can form in several beyond the Standard Model theories with an extended Higgs sector such as th…
Domain walls in the Two-Higgs-Doublet Model and their charge and CP-violating interactions with Standard Model fermions Open
A bstract Discrete symmetries play an important role in several extensions of the Standard Model (SM) of particle physics. For instance, in order to avoid flavor changing neutral currents, a discrete Z 2 symmetry is imposed on the Two-Higg…
Determination of CP-violating Higgs couplings with transversely-polarized beams at the ILC Open
We study possible CP-violation effect of the Higgs to $Z$ boson coupling\nat the future $e^+ e^-$ collider (ILC). We find that the azimuthal angular distribution of the muon pair, produced by $e^+ e^- \\rightarrow H Z \\rightarrow H \\mu^+…
Dark matter phenomenology in Z’2 broken singlet extended 2HDM Open
Many different approaches have been made to explain the nature of dark matter (DM), but it remains and unsolved mystery of our universe. In this work we examine a type II two-Higgs-doublet model extended by a complex singlet (2HDMS), where…
R&D for positron sources at high-energy lepton colliders Open
Several designs for high-energy Lepton Colliders serving as Higgs factories but extendable to higher energies up to the TeV range are under discussion. The most mature design is the International Linear Collider (ILC), but also the Compact…
SM fermion scattering off electric charge and CP-violating domain walls in the 2HDM Open
In several models of beyond Standard Model physics (BSM) discrete symmetries play an important role. For instance, in order to avoid flavor changing neutral currents (FCNC), a discrete $Z_2$ symmetry is imposed on Two-Higgs-Doublet-Models …
View article: Focus topics for the ECFA study on Higgs / Top / EW factories
Focus topics for the ECFA study on Higgs / Top / EW factories Open
In order to stimulate new engagement and trigger some concrete studies in areas where further work would be beneficial towards fully understanding the physics potential of an $e^+e^-$ Higgs / Top / Electroweak factory, we propose to define…
Investigation Of Plasma Stability Of The Prototype Plasma Lens For Positron Matching Open
The quest for novel technologies in the ever-evolving landscape of scientific exploration has led to the investigation of plasma lensing as a potential solution for optical matching devices for all kinds of positron sources. This research …
Impact of longitudinally and transversely polarized beams on probing <i>CP</i>-violating <i>HZZ</i> interactions at the ILC Open
We study possible CP-violation effects of the Higgs to Z -boson coupling at a future e + e − collider, e.g. the International Linear Collider (ILC). We find that the azimuthal angular distribution of the muon pair, produced by e + e − → HZ…
View article: High-rate electron detectors to study Compton scattering in non-perturbative QED
High-rate electron detectors to study Compton scattering in non-perturbative QED Open
Research in non-perturbative QED in strong-field backgrounds has gained interest in recent years, due to advances in high-intensity laser technologies that make extreme fields accessible in the laboratory. One key signature of strong-field…
Dark matter phenomenology in Z'2 broken singlet extended 2HDM Open
Many different approaches have been made to explain the nature of dark matter (DM), but it remains and unsolved mystery of our universe. In this work we examine a type II two-Higgs-doublet model extended by a complex singlet (2HDMS), where…
Dark Matter phenomenology in 2HDMS Open
The constituents of dark matter are still an unresolved puzzle. Several Beyond Standard Model (BSM) Physics offer suitable candidates. In this study here we consider the Two Higgs Doublet model augmented with a complex scalar singlet (2HDM…
Status Report on the Hydrodynamic Simulations of a Tapered Plasma Lens for Optical Matching at the ILC $e^+$ Source Open
The International Linear Collider is a planned electron-positron linear collider with its positron source producing positrons by aiming undulator radiation onto a rotating target. The resulting, highly divergent positron beam requires imme…
Target tests for the ILC positron source Talk presented at the International Workshop on Future Linear Colliders (LCWS2023) Open
The positron source is an essential component of the International Linear Collider (ILC) and is an area that poses some design challenges. One consideration is the material for the target, where the 1014 positrons per second for the ILC ar…
Opportunities for studying $${ C }$$-even resonances at a 3–12 GeV photon collider Open
Recently, a $$\gamma \gamma $$ collider based on the existing 17.5 GeV linac of the European XFEL has been proposed. High-energy photons will be generated by Compton scattering of laser photons with a wavelength of 0.5–1 $${\,\upmu \mathrm…
Dark Matter Phenomenology in 2HDMS Open
The constituents of dark matter are still an unresolved puzzle. Several Beyond Standard Model (BSM) Physics offer suitable candidates. In this study here we consider the Two Higgs Doublet model augmented with a complex scalar singlet (2HDM…