Conveners
Morning session
- Davide Meloni (Istituto Nazionale di Fisica Nucleare)
Morning session
- Davide Meloni (Istituto Nazionale di Fisica Nucleare)
Morning session
- Ferruccio Feruglio (Istituto Nazionale di Fisica Nucleare)
Morning session
- Arsenii Titov (University of Padua and INFN)
Morning session
- Stefano Morisi (Istituto Nazionale di Fisica Nucleare)
Morning session
- Stefano Morisi (Istituto Nazionale di Fisica Nucleare)
Morning session
- Gustavo Burdman
Morning session
- Claudia Hagedorn (IFIC - UV/CSIC)
Morning session
- Stefan Antusch (University of Basel)
Morning session
- Salvador Centelles Chuliá (IFIC (CSIC - U. Valencia))
-
Domizia Orestano (Istituto Nazionale di Fisica Nucleare), Davide Meloni (Dipartimento di Matematica e Fisica & INFN Roma Tre)30/06/2025, 09:30
-
Paul Harrison (University of warwick)30/06/2025, 09:50
We propose a novel quark mass matrix texture-pair with five free parameters, which fits the four quark mass ratios $m_s/m_b$, $m_d/m_b$, $m_c/m_t$, $m_u/m_t$, and the four
Go to contribution page
CKM quark mixing observables. The matrices each have one texture zero, but the main innovation here is a ``geometric'' ansatz exploiting a pair of small complex expansion parameters, based on the geometry of the Unitarity... -
Zhi-zhong Xing (Institute of High Energy Physics, Chinese Academy of Sciences)30/06/2025, 10:30
In the canonical seesaw framework flavor mixing and CP violation in weak charged current interactions of light and heavy Majorana neutrinos are correlated with each other and described respectively by the $3\times 3$ matrices $U$ and $R$. We show that the very possibility of $\big|U^{}_{\mu i}\big| = \big|U^{}_{\tau i}\big|$ (for $i = 1, 2, 3$), which is strongly indicated by current neutrino...
Go to contribution page -
Eligio Lisi (Istituto Nazionale di Fisica Nucleare)30/06/2025, 11:30
-
Antonio Marrone (Istituto Nazionale di Fisica Nucleare)30/06/2025, 12:00
In theories of flavor based on modular invariance, correlations between quark and lepton observables are a natural expectation. These arise from their shared dependence on a common modulus field, from joint experimental constraints, and—in the context of Grand Unified Theories (GUTs) — from possible embedding into common gauge multiplets. Despite this, most bottom-up modular flavor models...
Go to contribution page -
Serguey Petcov (Istituto Nazionale di Fisica Nucleare)01/07/2025, 09:00
In the presence of a finite modular flavour symmetry, fermion mass hierarchies may be
Go to contribution page
generated by a slight deviation of the modulus from a symmetric point. We point out that
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, sourcing
active neutrino masses and the mass splitting... -
Steve King (University of Southampton)01/07/2025, 09:30
-
Michael Ratz (UC Irvine)01/07/2025, 10:00
Modular flavor symmetries are realized in string theory. These symmetries act on KK and winding modes. We show that winding modes (i) are key for the interpretation of modular flavor symmetries, (ii) are gauge fields responsible for conventional flavor symmetries, (iii) have different subsets become massless at different critical values of the modulus, and (iv) play an interesting role in CP violation.
Go to contribution page -
Gui-Jun Ding (University of Science and Technology of China)01/07/2025, 10:30
The original modular flavor symmetry requires supersymmetry to enforce the Yukawa couplings to be holomorphic modular forms. The non-holomorphic modular symmetry is a generation in which supersymmetry is unnecessary in principle. In this talk, we shall present motivation, the formalism and application of non-holomorphic modular symmetry. A predictive model for both quarks and leptons will be...
Go to contribution page -
Mu-Chun Chen (University of California at Irvine)01/07/2025, 11:30
-
Morimitsu Tanimoto (Niigata University)01/07/2025, 12:00
CP invariance is a very attractive solution to the strong CP problem in QCD. This solution requires the vanishing phase of (det M_d det M_u) of the mass matrices for the down- and up-type quarks. It happens if we have several zeros in the quark mass matrices. We proceed a systematic construction of texture zeros for the quark sector in the T^2/Z3 orbifold compactification. We also extend the...
Go to contribution page -
Guido Martinelli (Istituto Nazionale di Fisica Nucleare)02/07/2025, 09:00
-
Salvador Centelles Chuliá (IFIC (CSIC - U. Valencia))02/07/2025, 09:30
In this talk, I explore low-scale seesaw scenarios in which a single global U(1) symmetry — and its spontaneous breaking — plays multiple theoretical roles and determines the resulting phenomenology. I will present four example models that share a similar particle content but differ only in their charge assignments, leading to qualitatively distinct physical scenarios, where the Goldstone...
Go to contribution page -
Claudia Cornella (CERN)02/07/2025, 10:00
The hierarchical structure of fermion masses and mixings suggests the presence of an underlying mechanism, for which many ideas have been put forward. In this talk, I present a systematic framework to explore such mechanisms from a "global" perspective, as developed in recent studies of the Froggatt-Nielsen mechanism in the quark and lepton sectors (arXiv:2306.08026, 2501.00629). This global...
Go to contribution page -
Sebastian Jaeger (University of Sussex)02/07/2025, 10:30
-
Enrico Nardi (INFN-LNF & NICPB, Tallinn)02/07/2025, 11:30
The present acceleration of the Universe can be sourced by the continuous generation of an energy density $\rho_b$ associated with a certain field $\varphi_b$. This idea is implemented by adding a new tensor term to Einstein equation. The creation process requires $\rho_b\neq 0$ as an initial condition, which is enforced by identifying $\varphi_b$ with the axion of a hidden gauge group that...
Go to contribution page -
Marco Nardecchia (Istituto Nazionale di Fisica Nucleare)02/07/2025, 12:00
In recent years, there has been great interest in the community toward New Physics scenarios involving light new degrees of freedom. In this talk, I will discuss the importance of the ultraviolet completion of such scenarios, using the case of a light vector as an example. I will show that the resulting flavour structure is of the Minimal Flavor Violation type, and I will discuss a possible...
Go to contribution page -
Ernest Ma (University of California, Riverside)03/07/2025, 09:00
Flavor symmetry and other ideas beyond the standard model may be achieved using the dark sector, while keeping only the one SM Higgs doublet.
Go to contribution page -
Myriam Mondragon (Instituto de Fisica, UNAM)03/07/2025, 09:30
We present two multi-scalar models, with S3 and Q6 flavour symmetries, respectively. We show how in general the doublet-singlet structure of these types of symmetries accommodates very well the quark sector and CKM matrix. In both models we check whether the co-bimaximal mixing pattern can be found in the neutrino sector. We use S3 as flavour symmetry in a B-L model, and we take complex vev's...
Go to contribution page -
Thomas Kephart (Vanderbilt University)03/07/2025, 10:00
We have been developing the Mathematica package LieART for handling Lie group representation, their products and their decomposition to maximal subgroups. LieART can be a useful tool for model building and other applications. We will give an overview.
Go to contribution page -
Giulia Ricciardi (Istituto Nazionale di Fisica Nucleare)03/07/2025, 10:30
Some key topics characterizing 331 models and their viability—both from
Go to contribution page
a theoretical and phenomenological perspective—are discussed. -
Silvia Pascoli (University of Bologna)03/07/2025, 11:45
In this talk I will discuss the connection between neutrinos and dark sectors. Neutrino masses remain unexplained. Their origin could arise in models at scales below the electroweak one, the so-called dark sectors. I will focus on rich dark sectors that have multiple sectors, in analogy to the Standard Model. I will review how neutrino masses can be generated in such models and how the latter...
Go to contribution page -
Stefan Antusch (University of Basel)03/07/2025, 12:15
Under the assumption that the 2023 pulsar timing array (PTA) results for a stochastic gravitational wave (GW) background at nanohertz frequencies is generated by metastable cosmic strings, we analyze the potential of present and future GW observatories for probing the change of particle degrees of freedom caused, e.g., by a supersymmetric (SUSY) extension of the Standard Model (SM). We find...
Go to contribution page -
Heinrich Päs04/07/2025, 09:00
Quantum gravitational effects are expected to reveal themselves at extreme energies, cosmological distances, in a break-down of standard quantum mechanics, or in the breaking of global symmetries. Neutrinos offer a unique potential to probe such effects: they are perfect quantum probes, their masses may be related to lepton number or flavor and thus global symmetry breaking and extra-galactic...
Go to contribution page -
Gustavo Burdman04/07/2025, 09:30
We explore models of baryogenesis at temperatures below the electroweak scale. In particular, we focus in a realization which makes clear the connection between low temperature baryogenesis and highly displaced vertices. The model involves the out of equilibrium decay of Majorana fermions at post-sphaleron temperatures. We present the phenomenological constraints from flavor, neutron...
Go to contribution page -
Jessica Turner (Durham University)04/07/2025, 10:00
I will discuss the formation and properties of domain walls arising from the spontaneous breaking of non-Abelian discrete symmetries, with a focus on the group S4, commonly used in models of lepton flavour. Such symmetry breaking leads to a rich vacuum structure and the emergence of various types of domain walls. While some of these walls are unstable and decay, others can be longer lived and...
Go to contribution page -
Arsenii Titov (University of Padua and INFN)04/07/2025, 10:30
We show that baryogenesis can arise from the cosmological evolution of a scalar field that governs CP-violating parameters, such as the Yukawa couplings and the theta terms of the Standard Model. During the Big Bang, this scalar may reach a CP-violating minimum, where its mass can be comparable to the inflationary Hubble scale. Such dynamics can emerge in theories featuring either a...
Go to contribution page -
Claudia Hagedorn (IFIC - UV/CSIC)04/07/2025, 11:30
We systematically investigate the possible phenomenological impact of residual flavour groups in the charged lepton sector. We consider all possible flavour charge assignments for abelian residual symmetries up to Z8. The allowed flavour structures of operators in Standard Model Effective Field Theory (up to dimension six) lead to distinctive and observable patterns of cLFV processes. We...
Go to contribution page -
Ivo de Medeiros Varzielas (CFTP, IST)04/07/2025, 12:00
I will cover some attempts at solving the flavour problem that employ modular flavour symmetries.
Go to contribution page