CP2023

Session

Theory

14 févr. 2023, 11:00

Amphi (École de Physique des Houches)

35. The shift-invariant orders of an ALP

Jonathan Kley (DESY)

14/02/2023 11:00

Usually, effective field theories (EFTs) for axion-like particles (ALPs) are built assuming a shift symmetry for the ALP due to the global U(1) Peccei-Quinn (PQ) symmetry that is at the heart of the axion mechanism. However, it is generally believed that global symmetries, in particular axion shift symmetries, can only be approximate. Therefore, it is important to include shift-breaking...

36. CP violating invariants in SMEFT

Emanuele Gendy Abd El Sayed (DESY)

14/02/2023 11:20

The Standard Model Effective Field Theory (SMEFT) is a framework that incorporates in a fairly model-independent way possible deviations from the Standard Model (SM). The additional terms it contains, in the form of higher-dimensional operator, may be include new sources of CP violation that could spoil the delicate CKM mechanism characterizing the SM. We argue that the best way to capture...

38. A late baryogenesis in an ekpyrotic-like universe with a hidden CP violation

Michaël Sarrazin (Institut UTINAM, CNRS/INSU, UBFC)

14/02/2023 17:00

Two-brane universes are among the cosmological models of interest such as ekpyrotic models. It is then a major concern to constrain these scenarios. In the last two decades, it has been theoretically demonstrated that matter exchange between branes can occur and can be a way to test these scenarios. Thus, neutron disappearance (reappearance) toward (from) a hidden brane has been recently...

46. CP violation and neutrinos

Jonathan Kriewald (LPC Clermont)

14/02/2023 17:30

39. Overview leptogenesis

Stéphane Lavignac (IPhT Saclay)

16/02/2023 10:50

40. Leptogenesis via a first-order phase-transition

Rémi Faure (Institut de Physique Théorique (CEA Saclay, Paris)), Rémi Faure (IPhT)

16/02/2023 11:20

Sterile Neutrinos are an attractive explanation for the masses of Standard Model neutrinos. They may also explain the asymmetry between matter and antimatter in our Universe. We will discuss a scenario in which these sterile Neutrinos acquire a time-dependent (Majorana) mass during a first-order phase-transition. This out-of-equilibrium process may lead to matter-antimatter asymmetry in the...

41. Implications of A_4 modular symmetry on neutrino mass, mixing and leptogenesis with linear seesaw

Rukmani Mohanta (University of Hyderabad)

16/02/2023 11:40

Motivated by the crucial role played by the discrete flavour symmetry groups in explaining the observed neutrino oscillation data, we consider the application $A_4$ modular symmetry in the linear seesaw framework. The basic idea behind using the modular symmetry is to minimize the necessity of the inclusion of extra flavon fields having specific vacuum expectation value (VEV) alignments. The...