Présidents de session
Parallel session 4: Neutrinos and Flavors
- Sacha Davidson
Parallel session 4: Neutrinos and Flavors
- Sandra Robles (King's College London)
Parallel session 4: Neutrinos and Flavors
- Danny Marfatia (University of Hawaii)
Parallel session 4: Neutrinos and Flavors
- Juan Herrero Garcia (University of Valencia, IFIC)
Parallel session 4: Formal aspects
- Susha Parameswaran (Liverpool University)
Parallel session 4: Formal aspects
- Susha Parameswaran (Liverpool University)
We present a simple extension of the Standard Model with three right-handed neutrinos with an additional U(1) abelian flavor symmetry, with a non standard leptonic charge 𝐿𝑒−𝐿𝜇−𝐿𝜏 for lepton doublets and arbitrary right-handed charges. We present a see-saw realization of such a scenario. The baryon asymmetry of the Universe is generated via thermal leptogenesis through CP-violating decays of...
I shall discuss a new spectrum of super heavy right handed neutrinos that can generate the observed Dark Matter relic and baryon asymmetry of the universe. Cosmological setting of the scenario is based on an universe filled with ultralight evaporating blackholes. I shall discuss how in this mechanism cosmic strings that come out as a consequence of dynamical generation of lepton number,...
The long-existing problem of neutrino mass and mixing can be connected to cosmological phenomena, such as the leptogenesis and the existence of dark matter (DM). In the extension of the type I seesaw model with two right-handed (RH) neutrinos, the seesaw Yukawa can drive the DM production, even with the competition from gravitational effect and constraints from leptogenesis. However, the DM...
Sterile neutrinos with masses below the keV scale might interact with standard model leptons via electromagnetic multipoles. While the electromagnetic interactions of active neutrinos are, either predicted to be very small, or strongly constrained by observations, the electromagnetic interactions of sterile neutrinos are orders of magnitude less constrained, and the predictions are model...
In this talk we will discuss the possibility of communicating between the visible and dark sectors via right-handed sterile neutrinos, which generate active neutrino masses. We will focus on the case of Majorana dark matter, with its relic abundance set by thermal freeze-out through annihilations into sterile neutrinos. We consider both an effective field theory approach and some simplified...
The super-weak model is a particle physics model which extends the Standard Model (SM) by a new U(1) gauge symmetry. In addition to the new mediator 𝑍′, a scalar particle 𝜒 is added to deal with the meta-stability of the SM vacuum, and right-handed neutrinos are introduced to account for the non-vanishing neutrino masses. In this talk, we investigate the cosmological implications of such an...
In this talk I will discuss the effect of Coherent Elastic neutrino Nucleus Scattering (CEvNS) observations on dark matter (DM) models mediated by a Z' boson. In these models a U(1)' gauge symmetry is introduced under which SM particles and dark sector fermions are charged. Several anomaly-free models are presented and we analyze the effect of the U(1)' interaction between quarks and lepton in...
The recent B-meson anomalies are coherently explained at the TeV scale by 4321 gauge models with hierarchical couplings reminiscent of the Standard Model Yukawas. We show that such models arise as the low-energy limit of a complete theory of flavor, based on a warped fifth dimension where each Standard Model family is quasi-localized in a different brane. The Higgs is identified as a...
The discrepancies between 𝑏→𝑠ℓ+ℓ− data and the corresponding Standard Model predictions constitute a very intriguing hint for new physics and many scenarios that can account for these anomalies have been proposed in the literature. However, only a single light new physics explanation, with a mass below the B meson scale, is possible: a light 𝑍′ boson.
I will discuss this solution together...
In this work we discuss MFV in the context of the Inverse Seesaw. The suppression in certain entries required for this approximation is explained with an additional 𝑈(1). The Goldstone Boson generated appears as a Majoron that can at the same time be identified with the axion of the MFVA model. The model presents heavy neutrinos that can be as light as a few 𝑇𝑒𝑉 in some cases, together with...
We discuss leptogenesis in a specific scotogenic model, where the Standard Model is extended by scalar and fermionic singlets and doublets charged odd under a 𝑍2 parity. This model is phenomenologically attractive as it is designed to dynamically generate small neutrino masses, provide viable dark matter candidates and also account for the current value of the (𝑔𝜇−2) anomaly. In this talk, we...
Neutrino oscillations are among the most promising sources of information on leptonic CP
violating phase, which can be obtained from the measurement of oscillation probabilities.
Matter can both suppress and enhance those probabilities and therefore affect the prospects
for successful measurement of this quantity. In my talk, I'll summarize results of a recent
study (2005.07719) in which...
European Spallation source (ESS) is a highly ambitious and promising multi-disciplinary research facility based on the World's most powerful pulsed neutrons. It will also generate the high intensity neutrino fluxes from very low to high energies suitable for the studies of both the neutrino oscillation as well as Coherent Elastic Neutrino-Nucleus Scattering (CE𝜈NS) at different baselines....
The Hyper-Kamiokande (HyperK) experiment, currently under construction, is expected to conduct precise measurements of the Diffuse Supernova Neutrino Background (DSNB). This requires all backgrounds to be well understood. A possible source of background that has not been considered
so far is that from sub-GeV dark matter (DM) which annihilates into neutrinos. We conduct dedicated simulations...
The Tadpole Conjecture puts sever constraints on the stabilization of a large number of moduli by claiming that in such settings the flux contribution to the tadpole grows at least linearly with the number of stabilized fields. In this talk we present the first conceptual argument that explains this linear scaling setting and clarifies why it sets in only for a large number of stabilized...
Gravitational wave detection has motivated the study of effective field theories (EFTs) that describe deviations from General Relativity in the strong-field regime. One example is given by EFTs describing a shift-symmetric scalar field coupled to the graviton, which can lead to black hole hair if specific interactions are considered.
We can constrain such interactions from the point of view...
We perform a quantization of globally scale-invariant quadratic gravity by means of the covariant operator formalism and arrive at a fresh perspective on the ghost problem in fourth order theories of gravity. After reducing the originally fourth order theory to second order in time derivatives via the introduction of an auxiliary tensor field, we identify the full Fock space of quantum states...
We compare the massive Kalb-Ramond and Proca fields with a quartic self-interaction and show that the same strong coupling scale is present in both theories. In the Proca theory, the longitudinal mode enters the strongly coupled regime beyond this scale, while the two transverse modes propagate further and survive in the massless limit. In contrast, in case of the massive Kalb-Ramond field,...
We present a method to obtain a scalar potential at tree level from a pure gauge theory on nilmanifolds, a class of negatively-curved compact spaces, and discuss the spontaneous symmetry breaking mechanism induced in the residual Minkowski space after compactification at low energy. We show that the scalar potential is completely determined by the gauge symmetries and the geometry of the...
During the last decade, superrenormalizable or UV-finite theories of pure gravity and gauge theories were proposed in the framework of weakly nonlocal quantum field theories, regardless of the number of spatial dimensions. They are inspired by the success of string theory to improve the UV-behavior of local quantum field theories. Furthermore, the nonlocal scale acts as a smooth...
Gauge theories are central in describing the fundamental interactions of particles both within and beyond the Standard Model. However, our knowledge on the infrared phases (for instance the vacuum structure) is limited once the theory becomes strongly-coupled. In this talk, we will try to sketch a generic and rigorous proof of chiral symmetry breaking in the confining phase of QCD-like...
