FLASY 2022 - 9th Workshop on Flavour Symmetries and Consequences in Accelerators and Cosmology

Session

Parallel Session II.1

28 Jun 2022, 16:45

Conveners

Parallel Session II.1

• Monika Blanke

25. Long-lived particles and meson decays in $N_R$LEFT

Rebeca Beltran (IFIC (CSIC-UV))

28/06/2022, 16:45

Electroweak scale neutrino mass models predict the existence of heavy neutral leptons (HNLs) at an energy range that could be within reach of collider experiments. In particular, GeV scale HNLs could be produced in heavy meson decays at the LHC. In this scenario, the relevant theory to study HNL phenomenology is the low-energy effective field theory extended with right-handed neutrinos, $N_R$,...

36. Multiboson signals in the UN2HDM

João Seabra

28/06/2022, 17:00

Cascade decays of new particles like a heavy Z’ gauge boson might produce distinctive experimental signatures that are still uncovered by new physics searches at the Large Hadron Collider. We introduce in this work the UN2HDM, which enlarges the gauge symmetry of the Next-to-two-Higgs doublet model (N2HDM), a Standard Model extension with two complex Higgs doublets and one complex Higgs...

12. Collider phenomenology of neutral scalars in a flavoured muti-Higgs model

João Pedro Pino Gonçalves (University of Aveiro)

28/06/2022, 17:15

In this presentation, I shall discuss on collider signatures with a focus on new physics scenarios that are predicted in various classes of multi-Higgs doublet models, with a focus on a recently proposed BGL-like model, enhanced with an abelian U(1) flavour symmetry. A thorough analysis of one of these signatures is conducted in the context of the Large Hadron collider, based on a topology...

34. Exploring multi-Higgs models with softly broken large discrete symmetry groups

Miguel Levy (CFTP/IST)

28/06/2022, 17:30

We develop methods to study the scalar sector of multi-Higgs models with large discrete symmetry groups that are softly broken. While in the exact symmetry limit, the model has very few parameters and can be studied analytically, proliferation of quadratic couplings in the most general softly broken case makes the analysis cumbersome. We identify two sets of soft breaking terms which play...

18. A flavor model for cobimaximal mixing

Biswajit Karmakar

28/06/2022, 17:45

The lepton mixing ansatz, known as cobimaximal mixing, still remains an allowed mixing scheme for leptons which predicts a maximal value for the atmospheric mixing angle ($\theta_{23}=45^{\circ}$) and the Dirac CP phase is fixed at $\delta=\pm 90^{\circ}$. Here we analyze a minimal model to understand the cobimaximal lepton mixing based on $A_4$ non-Abelian discrete flavor symmetry. Tiny...

10. Hunting for Discrete Goldstone Bosons

Víctor Enguita-Vileta (Universidad Autónoma de Madrid)

28/06/2022, 18:00

Pseudo Goldstone Bosons (pGBs) arising from the spontaneous breaking of an exact discrete symmetry have non-zero scalar masses which are immune to quadratic corrections. This is at variance with non-linearly realized continuous symmetries, for which the masses of pGBs require an explicit breaking mechanism and enjoy no such protection. The resulting symmetry-protected masses and potentials...

97. Heavy neutrino-antineutrino oscillations at the HL-LHC

Jan Hajer (Universidade de Lisboa)

28/06/2022, 18:15

The Standard Model lacks an explanation for the observed light neutrino oscillation data. This can be alleviated by adding at least two right-handed Majorana fermions in order to generate neutrino masses via the seesaw mechanism. These right-handed Majorana fermions can be light enough to be collider accessible as long as they are nearly mass degenerate. These pseudo-Dirac heavy neutral...