782 citations · 8.1k across the 115 of their papers we have counts for
87 papers · 1 filter
Learning Astrophysical Uncertainties in Dark Matter Direct Detection with Simulation-Based Inference
Felix Kahlhoefer, Niklas Reus
We present a proof-of-concept study of neural ratio estimation (NRE) - a simulation-based inference algorithm - applied to WIMP direct detection using the XENONnT experiment as an…
Inverse phase transitions via dark sector chemical equilibration
Esau Cervantes, Felix Kahlhoefer, Jonas Matuszak +1
We study the cosmological evolution of the effective potential in a dark sector with a spontaneously broken Abelian gauge symmetry, populated out of equilibrium through the freeze-…
Can the universe be matter-dominated after a supercooled first-order phase transition?
Henda Mansour, Yann Gouttenoire, Felix Kahlhoefer
We show that the answer is generally no, at least not immediately. Bubble collisions leave behind a highly inhomogeneous scalar field with persistent relativistic gradients, produc…
Probing Sub-GeV Dark Matter via Migdal Effect-Induced Electron Excitations
Felix Kahlhoefer, Liangliang Su
The electron ionization predicted by the Migdal effect in dark matter-nucleus scattering enhances experimental sensitivity to sub-GeV dark matter. In this work, we demonstrate that…
Branching ratios for Higgs-mixed scalars at the GeV scale from hadronisation models with conservation laws
Stefan Gieseke, Felix Kahlhoefer, Henry Seebach
We investigate the decay modes of a CP-even scalar boson that mixes with the Standard Model Higgs boson, focusing on the mass range between 2 GeV and . Starting from a h…
Sub-GeV dark matter and multi-decay signatures from dark showers at beam-dump experiments
Elias Bernreuther, Nicoline Hemme, Felix Kahlhoefer +2
In models of strongly-interacting dark sectors, the production of dark quarks at accelerators can give rise to dark showers with multiple dark mesons in the final state. If some of…
Probing the Higgs Portal to a Strongly-Interacting Dark Sector at the FCC-ee
Cesare Cazzaniga, Annapaola de Cosa, Felix Kahlhoefer +3
This work explores exotic signatures from confining dark sectors that may arise in the collision mode at the Future Circular Collider. Assuming the Higgs boson mediates th…
DAMA/LIBRA and dark matter: decisive tension or contrived cancellation
Giorgio Busoni, Jonathan M. Cornell, Will Handley +6
The ANAIS-112 and COSINE-100 experiments were constructed to test the long-observed dark matter-like annual modulation signal reported by DAMA. While they have reported null result…
Dark Higgs-strahlung at Belle II: A distinctive dark sector signature with displaced vertices and missing energy
Francesca Acanfora, Felix Kahlhoefer
Dark photons with kinetic mixing are compelling mediators for the interactions between dark matter and Standard Model particles. While most experimental searches focus on fully vis…
Dark matter phase-in: producing feebly-interacting particles after a first-order phase transition
Cristina Benso, Felix Kahlhoefer, Henda Mansour
The freeze-in mechanism describes the out-of-equilibrium production of dark matter (DM) particles via feeble couplings or non-renormalisable interactions with large suppression sca…
t-channel dark matter at the LHC -- a whitepaper
Chiara Arina, Benjamin Fuks, Luca Panizzi +67
This report, summarising work achieved in the context of the LHC Dark Matter Working Group, investigates the phenomenology of -channel dark matter models, spanning minimal setup…
Leptophilic ALPs in Laboratory Experiments
Alexander Eberhart, Marco Fedele, Felix Kahlhoefer +2
We study the collider phenomenology of leptophilic axion-like particles (ALPs), i.e. pseudoscalar particles that couple only to charged leptons. Loops of charged leptons induce eff…
Sub-GeV dark matter and nano-Hertz gravitational waves from a classically conformal dark sector
Sowmiya Balan, Torsten Bringmann, Felix Kahlhoefer +2
Strong first-order phase transitions in a dark sector offer a compelling explanation for the stochastic gravitational wave background in the nano-Hertz range recently detected by p…
Finding excesses in model parameter space
Kierthika Chathirathas, Torben Ferber, Felix Kahlhoefer +1
Simulation-based inference (SBI) makes it possible to infer the parameters of a model from high-dimensional low-level features of the observed events. In this work we show how this…
Resonant or asymmetric: The status of sub-GeV dark matter
Sowmiya Balan, Csaba Balázs, Torsten Bringmann +9
Sub-GeV dark matter (DM) particles produced via thermal freeze-out evade many of the strong constraints on heavier DM candidates but at the same time face a multitude of new constr…
Not-so-inelastic Dark Matter
Giovani Dalla Valle Garcia, Felix Kahlhoefer, Maksym Ovchynnikov +1
Models of inelastic (or pseudo-Dirac) dark matter commonly assume an accidental symmetry between the left-handed and right-handed mass terms in order to suppress diagonal couplings…
Riding the dark matter wave: Novel limits on general dark photons from LISA Pathfinder
Jonas Frerick, Joerg Jaeckel, Felix Kahlhoefer +1
We note the possibility to perform a parametrically improved search for gauged baryon () and baryon minus lepton () Dark Photon Dark Matter (DPDM) using auxiliary channel d…
Dark matter relic density in strongly interacting dark sectors with light vector mesons
Elias Bernreuther, Nicoline Hemme, Felix Kahlhoefer +1
Stable dark matter particles may arise as pseudo-Goldstone bosons from the confinement of dark quarks interacting via a non-Abelian gauge force. Their relic abundance is determined…
Phenomenology of axion-like particles with universal fermion couplings -- revisited
Giovani Dalla Valle Garcia, Felix Kahlhoefer, Maksym Ovchynnikov +1
Axion-like particles (ALPs) emerge in many extensions of the Standard Model as pseudo-Goldstone bosons of a spontaneously broken global symmetry. Understanding their phenomenology…
Reconstructing axion-like particles from beam dumps with simulation-based inference
Alessandro Morandini, Torben Ferber, Felix Kahlhoefer
Axion-like particles (ALPs) that decay into photon pairs pose a challenge for experiments that rely on the construction of a decay vertex in order to search for long-lived particle…
Feebly Interacting Particles: FIPs 2022 workshop report
C. Antel, M. Battaglieri, J. Beacham +75
Particle physics today faces the challenge of explaining the mystery of dark matter, the origin of matter over anti-matter in the Universe, the origin of the neutrino masses, the a…
Dark Higgs Bosons at Colliders
Torben Ferber, Alexander Grohsjean, Felix Kahlhoefer
The Large Hadron Collider (LHC) has confirmed the Higgs mechanism to be responsible for generating mass in the Standard Model (SM), making it attractive to also consider spontaneou…
Fast and accurate AMS-02 antiproton likelihoods for global dark matter fits
Sowmiya Balan, Felix Kahlhoefer, Michael Korsmeier +2
The antiproton flux measurements from AMS-02 offer valuable information about the nature of dark matter, but their interpretation is complicated by large uncertainties in the model…
Global fits of simplified models for dark matter with GAMBIT II. Vector dark matter with an -channel vector mediator
Christopher Chang, Pat Scott, Tomás E. Gonzalo +2
Global fits explore different parameter regions of a given model and apply constraints obtained at many energy scales. This makes it challenging to perform global fits of simplifie…