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Volodymyr Takhistov (QUP, KEK)10/8/24, 9:15 AM
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Michal Malinský (IPNP, Charles University, Prague)10/8/24, 9:45 AM
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David Milstead (Fysikum, Stockholms Universitet)10/8/24, 10:15 AM
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John Gargalionis (IFIC)10/8/24, 11:15 AM
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HOOMAN DAVOUDIASL (Brookhaven National Laboratory)10/8/24, 11:40 AM
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Yohei Ema10/8/24, 12:05 PM
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Bahaa Ilyas (Technical University of Munich)10/8/24, 12:30 PM
A persistent issue in electroweak baryogenesis calculations is the significant disparity in predictions yielded by different approaches, with variations spanning several orders of magnitude. In this study, we examine a system comprising two fermion flavours, proposing the existence of two sources of CP-violating. The semiclassical force and a new resonantly enhanced mixing source can be...
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Ana M. Teixeira (LPC Clermont)10/8/24, 2:15 PM
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Julian Heeck (University of Virginia)10/8/24, 2:45 PM
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Giovanni Dal Maso (Psul Sherrer Insitut - PSI)10/8/24, 3:05 PM
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Stefan E. Müller (Helmholtz-Zentrum Dresden-Rossendorf)10/8/24, 3:25 PM
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Youngjoon Kwon (Department of Physics, Yonsei University)10/8/24, 4:15 PM
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Riccardo Fantechi (INFN - Sezione di Pisa)10/8/24, 4:35 PM
Rare kaon decays are among the most sensitive probes of both heavy and light new physics beyond the Standard Model description thanks to high precision of the Standard Model predictions, availability of very large datasets, and the relatively simple decay topologies. The NA62 experiment at CERN is a multi-purpose high-intensity kaon decay experiment, and carries out a broad rare-decay and...
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Mr Kevin Alberto Urquía-Calderón (Niels Bohr Institute)10/8/24, 4:55 PM
Heavy Neutral Leptons (HNLs) are hypothetical particles that are able to explain neutrino oscillations. The presence of HNLs induces charged lepton flavor violating (cLFV) processes. Non-observations of these processes puts the strongest limits on parameters of HNL much heavier than the electroweak scale.
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We demonstrate that for such HNLs, the branching ratio of cLFV processes is actually... -
Mr Tim Kretz (Karlsruher Institut für Technologie (KIT - TTP))10/8/24, 5:15 PM
In modern experiments on flavour physics it is possible to search for the decays of $B$’s, $D$’s, or $\tau$’s into final states with heavy neutrinos $N$ (a.k.a. heavy neutral leptons). I present a common study of theorists and experimentalists from Belle II on constraints on $B-> D^{*} \ell N$. Next I discuss the status of the theory predictions of the various $N$ decay rates. In scenarios in...
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René Reimann (Johannes Gutenberg University, Mainz)10/8/24, 5:35 PM
The magnetic moment anomaly of the muon, that relates the cyclotron and spin precession frequency, provides one of the most stringent tests of the Standard Model of Particle Physics since it is measured and theoretically predicted to very high precision. Deviations between theoretical prediction and experimental measurements can be used to investigate tensions in the methods or can be...
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Stefan Antusch (University of Basel)10/9/24, 9:00 AM
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Richard Ruiz (IFJ PAN)10/9/24, 9:30 AM
Whether lepton number is a conserved or violated symmetry of nature remains one of the most pressing questions today, with far-reaching consequences across astrophysics, particle physics, and nuclear physics. If lepton number is indeed violated, it is also unknown whether it occurs at a scale accessible with laboratory experiments. The discovery of lepton number violation in the laboratory...
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Jonathan Kriewald (IJS)10/9/24, 9:55 AM
We determine the prospect of observing genuine lepton number violating (LNV) signals at hadron
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colliders in the context of type II seesaw.
The model features smoking gun signals with same-sign di-leptons and jets that may be the
primary observable channel in a certain portion of parameter space.
The charged lepton flavour composition in the minimal model relates to the origin of neutrino... -
Michele Frigerio10/9/24, 10:15 AM
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Nuria Rius (IFIC, CSIC-Valencia University)10/9/24, 11:05 AM
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Peter Maták (Comenius University in Bratislava)10/9/24, 11:35 AM
We present a Dirac leptogenesis model in which the only out-of-equilibrium particles are right-handed neutrinos undergoing asymmetric scatterings. They are produced from a negligible initial abundance and their density freezes in soon after reheating. Even though the asymmetry source term vanishes, we demonstrate that opposite asymmetries of right-handed neutrinos and standard model leptons...
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Dr Rishav Roshan (University Of Southampton)10/9/24, 12:00 PM
We show that the process of non-instantaneous reheating during the post-inflationary period can have a sizable impact on the charged lepton Yukawa equilibration temperature in the early Universe. This suggests relooking the effects of lepton flavors in the leptogenesis scenario where the production and decay of right-handed neutrinos take place within this prolonged era of reheating. We find...
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Soumen Kumar Manna (Indian Institute of Technology Guwahati)10/9/24, 12:20 PM
A derivative coupling of an axion-like particle (ALP) with a B-L current can lead to the baryon asymmetry of the universe through spontaneous leptogenesis, provided there is a lepton number-breaking interaction in thermal equilibrium. Typically, this requires heavy ALPs and a high reheating temperature, as the lepton number-breaking is also linked to neutrino mass generation. In this study, we...
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Michele Maltoni (Instituto de Fisica Teorica UAM/CSIC)10/9/24, 2:00 PM
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Prof. Renata Zukanovich Funchal10/9/24, 2:30 PM
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Joscha Lauer (KIT)10/9/24, 2:55 PM
The Karlsruhe Tritium Neutrino (KATRIN) experiment aims to measure the effective electron antineutrino mass using ultra-high precision spectroscopy of tritium $\beta$-decay in the kinematic endpoint region. The most stringent upper limit on the neutrino mass was recently placed at $m_\nu c^2 < 0.45\,\mathrm{eV}$ ($90\,\%$ CL), using a fraction of the final dataset and improved operational...
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Daniel Naredo (IFT-UAM/CSIC)10/9/24, 3:15 PM
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Stefan Vogl10/9/24, 4:05 PM
Sterile neutrinos are well-motivated and simple dark matter (DM) candidates. However, sterile neutrino DM produced through oscillations by the Dodelson-Widrow mechanism is excluded by current X-ray observations and bounds from structure formation. One minimal extension, that preserves the attractive features of this scenario, is self-interactions among sterile neutrinos. In this work, we...
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Maksym Ovchynnikov (Karlsruhe Institute of Technology)10/9/24, 4:25 PM
Primordial neutrinos are important messengers from the Early Universe, affecting several key observables such as primordial nuclear abundances and cosmic microwave background. If some new physics existed at the time around neutrino decoupling, it would have left imprints on the neutrino distribution function, which requires solving the neutrino Boltzmann equation. Existing approaches have...
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Julian Günther (Universität Bonn)10/9/24, 4:45 PM
At the Deep Underground Neutrino Experiment (DUNE), a proton beam hits a fixed target leading to large production rates of mesons. These mesons can decay and potentially provide a source of long-lived neutral fermions. Examples of such long-lived fermions are heavy neutral leptons which can mix with the standard-model active neutrinos, and the bino-like lightest neutralino in...
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Chui-Fan Kong10/9/24, 5:05 PM
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Alejandro Ibarra (Technical University of Munich)10/10/24, 9:00 AM
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Francesco D'Eramo (University of Padua & INFN Padua)10/10/24, 9:30 AM
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Laura Lopez-Honorez10/10/24, 9:55 AM
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Dr Camilo Garcia Cely10/10/24, 10:20 AM
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Juri Smirnov (University of Liverpool)10/10/24, 11:15 AM
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Gonzalo Herrera (Virginia Tech)10/10/24, 11:35 AM
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Kevin Gonzalez Quesada (Case Western Reserve University)10/10/24, 11:55 AM
We discuss a simple theory for physics beyond the Standard Model where a Majorana dark matter is predicted from anomaly cancellation. We discuss in detail the minimal theory where the baryon number is a local symmetry spontaneously broken at the low scale. The correlation between the cosmological constraints on the dark matter relic density, the direct detection and collider bounds is...
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Giovani Dalla Valle Garcia (IAP - KIT)10/10/24, 12:15 PM
Models of inelastic (or pseudo-Dirac) Dark Matter (DM) commonly assume an accidental symmetry between the left-handed and right-handed mass terms in order to suppress diagonal couplings. We point out that this symmetry is unnecessary, because for Majorana fermions the diagonal couplings are not strongly constrained. Removing the requirement of such an accidental ad-hoc symmetry instead relaxes...
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Marieke Postma (Nikhef, Amsterdam, Netherlands)10/10/24, 2:00 PM
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Lisa Biermann (Institute for Theoretical Physics, Karlsruhe Institute of Technology)10/10/24, 2:30 PM
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Yuber F Perez-Gonzalez (IPPP, Durham University)10/10/24, 2:50 PM
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Sascha Weber (JGU Mainz)10/10/24, 3:20 PM
In this talk, we investigate the interplay between the observation of lepton number violating processes and the generation of the baryon asymmetry of the Universe via low-scale leptogenesis. We focus on the impact of non-standard interactions, beyond the usual Majorana mass term, on the observation of neutrinoless double beta decay and the resulting parameter space for successful leptogenesis....
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Miha Nemevšek (Jožef Stefan Institute)10/10/24, 4:10 PM
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Oleksii Mikulenko (Leiden University)10/10/24, 4:40 PM
A quasi-Dirac pair of Heavy Neutral Leptons possesses a number of features that make it an appealing target for search in the GeV mass scale at future collider experiments. This scenario is studied in the Left-Right Symmetric Model. Predictions for the HNL couplings to different lepton flavors are derived, and the possible probes of the model based on the LNV signature are considered.
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Jelle Groot (University of Amsterdam)10/10/24, 5:00 PM
An investigation of relatively light (GeV-scale), long-lived right-handed neutrinos is performed within minimal left-right symmetric models using the neutrino-extended Standard Model Effective Field Theory framework. Light sterile neutrinos can be produced through rare decays of kaons, $D$-mesons, and $B$-mesons at the Large Hadron Collider (LHC) and the Long-Baseline Neutrino Facility (LBNF)...
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Prativa Pritimita (Indian Institute of Science, Bangalore)10/10/24, 5:20 PM
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Herbert Dreiner (University of Bonn)10/11/24, 9:00 AM
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Julieta Gruszko (UNC Chapel Hill/TUNL)10/11/24, 9:25 AM
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Dr Jose Cuenca Garcia (University of Zurich)10/11/24, 9:55 AM
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Jing-Yu Zhu10/11/24, 10:15 AM
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Rebeca Beltrán (IFIC - University of Valencia and CSIC (Spain))10/11/24, 11:05 AM
In this talk, we discuss tree-level UV completions for dimension 6 and 7 operators in the Standard Model Effective Field Theory extended with right-handed neutrinos ($N_R$SMEFT). We reveal that every model generating lepton number violating (LNV) operators with right-handed neutrinos also leads to the formation of active neutrino masses. This intrinsic connection between LNV processes and the...
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Vaisakh Plakkot10/11/24, 11:25 AM
The addition of two gauge singlet right-handed neutrinos to the Standard Model is a minimal extension that can potentially solve multiple open questions at once, including the observed neutrino masses via the Type-I seesaw mechanism, and the baryon asymmetry of the universe via leptogenesis. We show that combining the constraints from low-scale leptogenesis and the current non-observation of...
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Martin Mojahed (JGU/ TUM)10/11/24, 11:45 AM
We investigate the possibility of disentangling different new physics contributions to the rare meson decays $K\rightarrow\pi+$invisible and $B\rightarrow K(K^*)+$invisible through kinematic distributions in the missing invariant mass squared. We employ dimension-$6$ operators within the Low-Energy Effective Field Theory (LEFT), identifying the invisible part of the final state as either...
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Prof. Silvia Pascoli10/11/24, 12:05 PM
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Hridoy Debnath (Case Western Reserve University)
We discuss a class of theories that predict a fermionic dark matter candidate from gauge anomaly cancellation.
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As an explicit example, we study the predictions in theories where the global symmetry associated with baryon number is promoted to a local gauge symmetry.
In this context the symmetry-breaking scale has to be below the multi-TeV scale in order to be in agreement with the... -
Prof. Julia Harz
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Lukas Graf (Nikhef)
The new particle physics underlying any potential lepton-number-violating signal can be parametrized within the framework of effective field theory in terms of a set of higher-dimensional operators triggering a variety of distinct mechanisms for neutrinoless double beta decay (0vbb). While it appears to be challenging to unravel the dominant source of lepton number violation from the...
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