Pheno Journal Club: ‘GeV-scale QCD Axion’
January 29 | 12:00 - 13:00
Title: ‘GeV-scale QCD Axion’
Speaker: Thomas Steingasser (IFT)
Venue & Time: 12:00 / Gray Room 3
Abstract: In order to solve the strong CP problem, we study the possibility that the Peccei–Quinn symmetry is broken below the QCD scale. We find that a QCD axion can be above GeV, and may be among the observed η resonances. It is immune to quantum gravity corrections. The only fermion that has a U (1) Peccei–Quinn charge is the right-handed up quark. Flavor-changing neutral currents are surprisingly small, except for a possible but not necessary contribution to D0–D0 mixing. All accelerator and astrophysical limits can be evaded. The most significant constraint is the mass splitting between π± and π0. In a UV completed model, LHC can look for a dijet resonance in u ̄u,u ̄d, d ̄u channels.