FLASY 2018: 7th Workshop on Flavour Symmetries and Consequences in Accelerators and Cosmology

Session

Afternoon session I

2 Jul 2018, 14:30

Lecture Hall 1, Foyer, Department of Physics (University of Basel)

17. Sterile neutrino searches with the ICARUS detector

Andrea Zani (CERN)

02/07/2018, 14:30

The 760 ton ICARUS T600 detector performed a successful three-year physics run at the underground LNGS laboratories studying neutrino oscillations with the CNGS neutrino beam from CERN, and searching for atmospheric neutrino interactions. ICARUS performed a sensitive search for LSND like anomalous nu_e appearance in the CNGS beam, which contributed to constrain the allowed parameters to a...

16. Sterile Neutrino Searches at Future Colliders

Oliver Fischer (Karsruhe Institute of Technology)

02/07/2018, 15:00

Sterile neutrinos are among the most attractive extensions of the SM to generate the light neutrino masses observed in neutrino oscillation experiments.
When the sterile neutrinos are subject to a protective symmetry, they can have masses around the electroweak scale and potentially large neutrino Yukawa couplings, which makes them testable at planned future particle colliders.

In this talk...

27. Discrete Dark Matter and the reactor mixing angle

Eduardo Peinado (Universidad Nacional Autonoma de Mexico)

02/07/2018, 15:30

The existence of non-baryonic Dark Matter (DM) is well established by cosmological and astrophysical probes, however its detailed nature still remains elusive. Among the extensions of the Standard Model explaining the DM relic aboundance, the simplest one is the addition of an inert scalar to the theory. In this talk I intend to give a brief review of this scenario and its possible connection...

53. Fully Constrained Majorana Neutrino Mass Matrices Using Sigma(72x3)

Paul Fraser Harrison (University of Warwick (GB))

03/07/2018, 14:30

In many flavour models, the vacuum expectation values of flavon multiplets
form the fermion mass matrices. The VEVs and their symmetries lead to
constraints among the masses and the mixing observables. The presence of
coupling constants (corresponding to various flavon multiplets) leaves
some degrees of freedom of the mass matrices unconstrained. Recently we
introduced a single sextet of...

57. Pathways to Dirac Neutrinos

Rahul Srivastava (Instituto de Fisica Corpuscular (IFIC), Valencia - SPAIN)

03/07/2018, 15:00

More than eighty years after they were first proposed, neutrinos still remain an enigma. Although they are an integral part of Standard Model, still we know very little about them. In particular, the Dirac or Majorana nature of neutrinos remains a mystery. For a long time theoretical particle physicists believed that neutrinos must be Majorana in nature and several elegant mass generation...

9. Seesaw models for Dirac Neutrinos

Salva Centelles Chuliá

03/07/2018, 15:30

We describe the many pathways to generate Dirac neutrino mass through generalized dimension-5 operators a la Weinberg and dimension 6 operators. The presence of new scalars beyond the Standard Model Higgs doublet implies new possible field contractions, which are required in the case of Dirac neutrinos. We also notice that the extra symmetries needed to ensure the Dirac nature of neutrinos can...

28. Three loop neutrino masses

Ricardo Cepedello (IFIC - UV)

03/07/2018, 16:00

We systematically analyze the $d=5$ Weinberg operator at 3-loop order. From all possible topologies only a small number of them can generate a genuine 3-loop neutrino mass for which $d=5$ tree-level, 1-loop and 2-loop, as well as $d=7$ up to 1-loop, are guaranteed to be absent. Moreover, from the large list of all possible genuine neutrino mass diagrams, we find that they consist of variations...

26. Can an unbroken flavour symmetry provide an approximate description of lepton masses and mixing?

Prof. Andrea Romanino (SISSA)

04/07/2018, 14:30

We answer the following question: what are the flavour groups and representations providing, in the symmetric limit, an approximate description of lepton masses and mixings? We assume that neutrinos masses are described by the Weinberg operator. We find that in all cases the neutrinos are either anarchical or have an inverted hierarchical spectrum. In the context of SU(5) unification, only the...

25. SUSY Flavour in an A4xSU(5) model of muon g-2 and Dark Matter

Mr Jordan BERNIGAUD (LAPTh)

04/07/2018, 15:00

We investigate the structure of different softs terms in the context of an A4xSU(5) SUSY GUT model. While starting from a minimal flavour violation (MFV) benchmark point which lies in the correct region for dark matter constraint and giving the experimental value of muon g-2, we perform a scan over the different off-diagonal soft terms and study the impact of the flavour and dark matter...

55. Predicting the PMNS phase, theta_23 and fermion mass ratios from GUT flavour models with CSD2

Charanjit Kaur (IISc)

04/07/2018, 15:30

Constrained Sequential neutrino Dominance of type 2 (referred to as CSD2) is an attractive building block for Grand Unified Theory (GUT) flavour models because it predicts a non-zero leptonic mixing angle $\theta_{13}^{PMNS}$, a deviation of $\theta_{23}^{PMNS}$ from $\pi /4$, as well as a leptonic Dirac CP phase $\delta^{PMNS}$ which is directly linked to the CP violation relevant for...

41. A Realistic U(2) Model of Flavor

Dr Robert Ziegler (CERN)

04/07/2018, 16:00

I will discuss a simple $U(2)$ flavor model compatible with an $SU(5)$ GUT structure. All hierarchies in fermion masses and mixings arise from powers of two small parameters that control the $U(2)$ breaking pattern. In contrast to previous $U(2)$ models this setup can be realized without supersymmetry and provide an excellent fit to all SM flavor observables including neutrinos, thus...

35. Effective Theories of Flavor and the Non-Universal MSSM

María Luisa López Ibáñez (Università di Roma Tre)

05/07/2018, 14:30

Flavor symmetries à la Froggatt-Nielsen (FN) provide a compelling way to explain the hierarchies of fermionic masses and mixing angles in the Yukawa sector. In Supersymmetric (SUSY) extensions of the Standard Model where the mediation of SUSY breaking occurs at scales larger than the breaking of flavor, this symmetry must be respected not only by the Yukawas of the superpotential, but by the...

40. Slepton Non-Universality in the Flavor-Effective MSSM

Aurora Melis

05/07/2018, 15:00

Supersymmetric theories supplemented by an underlying flavor-symmetry provide a rich playground for model building aimed at explaining the flavor structure of the Standard Model. In the case where supersymmetry breaking is mediated by gravity, the soft-breaking Lagrangian typically exhibits large tree-level flavor violating effects, even if it stems from an ultraviolet flavor-conserving...

49. FLASY 2018 Summary talk

Ivo de Medeiros Varzielas (CFTP, IST, University of Lisbon)

05/07/2018, 15:30

Will be added later