Invisibles25 Workshop

Session

Neutrinos

Sep 1, 2025, 9:30 AM

500/1-001 - Main Auditorium (CERN)

Conveners

Neutrinos

• Joachim Kopp (CERN)

Neutrinos

• Joachim Kopp (CERN)

Neutrinos

• Andrea Caputo (U. Rome La Sapienza)

Neutrinos

• Andrea Caputo (U. Rome La Sapienza)

18. Welcome

Clara Murgui Galvez (CERN), Joachim Kopp (CERN), Maria Pestana Da Luz Pereira Ramos, Miguel Escudero Abenza (CERN), Valerie Domcke (CERN)

9/1/25, 9:30 AM

Talk

28. Neutrino Signals at Dark Matter Experiments

Patrick Foldenauer (Instituto de Física Teórica UAM/CSIC Madrid)

9/1/25, 9:45 AM

Invited Talk

29. Supernova Neutrinos

Damiano Francesco Giuseppe Fiorillo (Niels Bohr Institute, University of Copenhagen)

9/1/25, 10:15 AM

Invited Talk

137. Sufficient and Necessary Conditions for Collective Neutrino Instabilities

Dwaipayan Mukherjee (Tata Institute of Fundamental Research)

9/1/25, 11:30 AM

Talk

A dense neutrino gas can exhibit collective flavor oscillations, driven by neutrino–neutrino forward scattering, which profoundly affect flavor evolution in core-collapse supernovae and the early Universe. While numerous studies have shown that a zero crossing in the difference of flavor distributions ($g_{\Gamma}$) of neutrinos determines the existence and character of instabilities, a...

135. Tracing Neutrino–Dark Matter Interactions via Neutrino Clustering

Pietro Ghedini

9/1/25, 11:35 AM

Talk

We investigate the clustering of neutrinos on both galactic and extragalactic scales, with the aim of probing their standard and non-standard properties. We focus on potential signatures of neutrino–dark matter interactions, which could imprint detectable features on the local distribution of cosmological neutrinos. Our phenomenological approach aims to produce testable predictions for future...

132. Primordial High Energy Neutrinos

Nicolas Grimbaum Yamamoto (Université Libre de Bruxelles)

9/1/25, 11:40 AM

Talk

Among the few methods to probe the early Universe through the observation of primordial particles, one possibility remains relatively unexplored: the detection of high-energy neutrinos emitted shortly after the Big Bang, originating from the decay or annihilation of early-Universe relics.

We present a general study of this scenario. First, we emphasise that such neutrinos could exhibit...

117. Does the 220 PeV Event at KM3NeT Point to New Physics?

Dibya S. Chattopadhyay (Oklahoma State University)

9/1/25, 11:45 AM

Talk

The KM3NeT collaboration recently reported the observation of KM3-230213A, a neutrino event with an energy of 220 PeV, $\mathcal{O}(10)$ times more energetic than the highest-energy neutrino in IceCube’s catalog. Despite its larger effective area and longer data-taking period, IceCube has not observed similar events, leading to a tension quantified between ~2$\sigma$ and 3.5$\sigma$, depending...

14. Benchmarking nuclear matrix elements of 0νββ decay with high-energy nuclear collisions

Giuliano Giacalone

9/1/25, 11:50 AM

Talk

Reducing uncertainties in theoretical evaluations of the nuclear matrix elements (NME) is crucial for designing and interpreting experiments aimed at discovering neutrinoless double beta decay. In this work, we identify a new class of observables, distinct from those employed in low-energy nuclear structure applications, that are strongly correlated with the values of the NME: momentum...

11. A new modular mechanism for neutrino masses from low-scale seesaw

Matteo Parriciatu (Università degli Studi Roma Tre)

9/1/25, 11:55 AM

Talk

In the presence of a finite modular flavour symmetry, fermion mass hierarchies may be generated by a slight deviation of the modulus from a symmetric point. This small parameter governing charged-lepton mass hierarchies may also be responsible for the breaking of lepton number in a symmetry-protected low-scale seesaw. In this talk, I will illustrate the implementation and the phenomenological...

35. Stars as a Laboratory for Fundamental Physics

Georg Raffelt (MPI Physik, Munich)

9/1/25, 2:00 PM

Invited Talk

32. Ab-initio Nuclear Matrix Elements

Jason Holt

9/1/25, 3:45 PM

Invited Talk

56. Nuclear matrix elements for neutrinoless double-beta decay

Javier Menendez (University of Barcelona)

9/1/25, 4:15 PM

Invited Talk

33. Neutrino flavor instabilities in dense astrophysical environments

Julien Froustey (University of California, Berkeley (USA))

9/1/25, 4:45 PM

Invited Talk