Speaker
Dr
NING CHEN
(Nankai University)
Description
We propose an SU(6) GUT, which enjoys a global symmetry of SU(2)*U(1)_{PQ}. The GUT breaking to the SM gauge symmetry undergoes two stages. The second stage of symmetry breaking scale corresponds to the axion physics scale. By studying the Peccei-Quinn quality constraint, we show an upper bound to the axion decay constant to be consistent with the classical axion window. The QCD axion, which has a KSVZ-type coupling to the vector-like quarks, has a DFSZ-type effective di-photon couplings, and can be probed by the upcoming IAXO experiment. Some other issues of the SU(6) GUT will be discussed as well.
Primary author
Dr
NING CHEN
(Nankai University)
Co-authors
Mr
ZHAOLONG TENG
Mr
YUTONG LIU
