Invisibles24 Workshop

Session

Poster Session

4 Jul 2024, 13:10

Aula Giorgio Prodi - San Giovanni in Monte, University of Bologna (Bologna, Italy)

39. A closer look at dark photon production modes

Peter Reimitz (Instituto de Fisica, USP)

High luminosity colliders and fixed target facilities using proton beams are sensitive to new weakly coupled degrees of freedom across a broad mass range. We discuss various production modes for dark vector particles in proton beam experiments. In particular, we will have a closer look at bremsstrahlung which is important for dark vectors with masses between 0.5 GeV and 1.5 GeV, due to...

18. A framework for Sommerfeld effect and bound state formation of colored mediators in dark matter studies

Martin Napetschnig (Technische Universität München)

Simplified t-channel dark matter models serve as a versatile and well-motivated framework for rich dark sectors that are widely studied by ongoing experimental and theoretical efforts. In this work,
we investigate the impact of non-perturbative effects on the dark matter relic abundance for two representative models of this kind of models, focusing on regions of parameter space where...

1. Constraining majoron from big bang nucleosynthesis

Sougata Ganguly (Chungnam National University)

Majoron-like particle $J$ in the mass range between 1MeV to 10 GeV, which dominantly decays into the standard model (SM) neutrinos, can be constrained from the big-bang nucleosynthesis (BBN). For majoron lifetime ($\tau_J$) smaller than 1sec, the injected neutrinos from the majoron decay heat up the background plasma and it results in the deficit of Helium-4 abundance and enhancement of...

63. Freeze-in at Strongly Coupling in the $Z^\prime$ Model

David Cabo Almeida (University of Messina (Italy))

We consider the possibility for Dark Matter (DM) freeze-in occurring at high values of the couplings between the DM and the SM states. Such a possibility requires a reheating temperature of the Universe below the value of the DM mass. Contrary to conventional freeze-in scenarios, the values of the DM couplings required by the correct relic density are within the reach of Direct Detection...

14. Gravitational wave imprints of the doublet left-right symmetric model

Dhruv Ringe (Indian Institute of Technology Indore)

We study the stochastic gravitational wave (GW) background resulting from the strong first-order phase transition (SFOPT) associated with $SU(2)_R\times U(1)_{B-L}$-breaking in the doublet left-right symmetric model (DLRSM). For different values of the symmetry-breaking scale $v_R =20,~30$, and $50$ TeV, we construct the one-loop finite temperature effective potential to explore the parameter...

25. Limits on heavy neutral leptons, $Z'$ bosons and majorons from high-energy supernova neutrinos

Kensuke Akita (University of Tokyo)

Light hypothetical particles with masses up to $\mathcal{O}(100)$ MeV can be produced in the core of supernovae. Their subsequent decays to neutrinos can produce a flux component with higher energies than the standard flux. We study the impact of heavy neutral leptons, $Z'$ bosons, in particular $U(1)_{L_\mu−L_\tau}$ and ${\rm U}(1)_{B−L}$ gauge bosons, and majorons coupled to neutrinos...

45. The ALP window to HNLs

Marta Burgos

Axion-Like Particles (ALPs) and Heavy Neutral Leptons (HNLs) represent compelling extensions to the Standard Model, each offering solutions to distinct shortcomings of this framework. Investigating the simultaneous presence of both ALPs and HNLs opens an intriguing window for new detection opportunities. We focus on a particularly promising process, the JALZ topology, which exploits the...

3. The Dark Hypercharge Symmetry

Hemant Kumar Prajapati (Indian Institute of Science Education and Research Bhopal)

$U(1)$ extension of the Standard Model (SM) is well motivated, where the charges of SM fermions are fixed by gauge anomaly cancellations and Yukawa interactions. The scientific literature extensively covers the study of vector solutions in which SM fermions are vector-like under new $U(1)_X $ symmetry, allowing the Yukawa structure to remain invariant. On the other hand, chiral solutions in...

30. The Light Dark Matter eXperiment (LDMX)

Einar Elén (Lund university)

The constituents of dark matter are still unknown, and the viable possibilities span a very large mass range. Specific scenarios for the origin of dark matter sharpen the focus on a narrower range of masses: the natural scenario where dark matter originates from thermal contact with familiar matter in the early Universe requires the DM mass to lie within about an MeV to 100 TeV. Considerable...

41. The SABRE South Experiment at the Stawell Underground Physics Laboratory

The SABRE South Collaboration .

The SABRE experiment aims to detect an annual rate modulation from dark matter interactions in ultra-high purity NaI(Tl) crystals in order to provide a model independent test of the signal observed by DAMA/LIBRA. It is made up of two separate detectors that rely on joint crystal R&D activity; SABRE South located at the Stawell Underground Physics Laboratory (SUPL), in regional Victoria,...

7. Tidal Disruption Events as Dark Matter Probe

Dr Motoko Fujiwara (Technical University of Munich)

Tidal Disruption Event (TDE) is an astrophysical event where stars are tidally disrupted as they pass near a black hole. This event results in a flux of high-energy neutrinos. IceCube data suggests the presence of these neutrinos in TDEs. The emitting region of neutrinos and photons is likely to be located near the central black hole, where the dark matter density may be significantly higher...

6. Using the motion of galaxies to investigate the nature of dark matter

Yan Lai (The University of Queensland)

Two of the biggest mysteries of modern cosmology are the nature of dark matter and dark energy. One of the leading candidates for explaining these is a modified theory of gravity. In this talk, I will present an improved method of using the motion of galaxies (peculiar velocity) to measure the rate of growth of the Large-Scale Structure. The growth rate of the Large-Scale Structure (fσ_8) is...