Conveners
Axions
- Stefano Rigolin
We investigate the time modulation of alpha and weak nuclear decays as a method to probe axion dark matter. To this end, we develop a theoretical framework to compute the $\theta$-dependence of alpha and weak nuclear decays, including electron capture and $\beta$ decay, which enables us to predict the time variation of alpha and weak radioactivity in response to an oscillating axion dark...
Part of the community has intensively searched for ALP signals, as well as conducted dedicated data analyses to identify potential evidence of New Physics compatible with an ALP, resulting in constraints on the ALP parameter space. Therefore, it is now the time to present a tool, ALPaca, that facilitates the combination among the different information on ALP physics.
The focus of this talk...
CP-violating probes are among the most promising and yet relatively unexplored ways to look for Axion-Like Particles (ALPs) and to investigate their phenomenology. In this talk, I will offer a complete and up-to-date overview of these new physics candidates. First, I will discuss in detail the phenomenology associated to this class of ALPs, with a focus on the possibility to probe them by...
We identify $m^2_{12}$ as a spurion of non-invertible Peccei-Quinn symmetry in the type II 2HDM with gauged quark flavor. Thus a UV theory which introduces quark color-flavor monopoles can naturally realize alignment without decoupling and can furthermore revive the Weinberg-Wilczek axion. As an example we consider the SU(9) theory of color-flavor unification, which needs no new fermions. This...
Froggatt-Nielsen models typically predict the existence of a light axion-like particle, pushing the new dynamic to a very high scale.
In this talk I will focus on models based on $Z_N$ discrete symmetries, which are counterexamples in which the new scale might in fact be much lower.
I will first chart the allowed parameter space from a set of theoretical considerations, and then focus on a...
Small instantons which increase the axion mass due to an appropriate modification of QCD at a high energy scale, can also enhance the effect of CP-violating operators to shift the axion potential minimum by an amount $\theta_{\rm ind}$, which is severely constrained by neutron electric dipole moment (nEDM) experiments.
In this talk, focusing on the dimension-six CP-odd operators in the...
