XXVI DAE-BRNS High Energy Physics Symposium 2024

On the common origin of flavour hierarchies and strong CP

Not scheduled

20m

Swatantrata Bhavan, Banaras Hindu University, Varanasi

Oral Beyond the standard model

Speaker

GURUCHARAN MOHANTA (Physical Research Laboratory, Ahmedabad, India)

Description

We propose a class of models based on the parity invariant Left-Right Symmetric Model (LRSM) which incorporates the mechanism of radiative generation of fermion masses while simultaneously possessing the solution to the Strong CP problem. A flavour non-universal gauged abelian symmetry is imposed on top of LRSM, which helps in inducing the masses of second and first-generation fermions at one-loop and two-loop, respectively, and thereby reproduces the hierarchical spectrum of the masses. Parity invariance sets the strong CP parameter vanishing at the zeroth order and the non-zero contribution arises at the two-loop level which is in agreement with the experimental constraints. The minimal model predicts flavour symmetry breaking scale and the $SU(2{)}_R$ symmetry breaking scale at the same level. Flavor non-universality of the new gauge interaction leads to various flavour-changing transitions both at quarks and leptonic sectors and, therefore, has various phenomenologically interesting signatures. The model predicts a new physics scale near ${10}^8$ GeV or above for phenomenological consistent solutions.