Weekly seminars

Rethinking the QCD axion

by Federico Mescia (Universitat de Barcelona)

auditorium (LAPTh)



9 chemin de Bellevue 74940 Annecy

The established theory of strong interactions, QCD, lacks a cogent 
explanation for why it does not violate the charge-parity symmetry to 
measurable levels.
An elegant mechanism, due to Roberto Peccei and Helen Quinn, comes with 
the clear-cut prediction of a new particle, the axion.
Although axions have been searched for since their proposal, in recent 
years this field is experiencing a strong increase of interest in the 
world-wide community.
After reviewing the axion solution of the strong-CP problem and the 
experimental status of axion searches, I will focus on some recent 
developments in axion model building, showing that the QCD axion 
parameter space is much larger than what traditionally thought. The 
implications for astrophysical limits and future experiments will be 
discussed as well.