A Visible QCD Axion from an Enlarged Color Group

@article{Gherghetta2016AVQ,
  title={A Visible QCD Axion from an Enlarged Color Group},
  author={Tony Gherghetta and Natsumi Nagata and Mikhail A. Shifman},
  journal={Physical Review D},
  year={2016},
  volume={93},
  pages={115010}
}
We consider the possibility of an enlarged QCD color group, SU(3+$N^\prime$) spontaneously broken to SU(3)$_c\times$SU($N^\prime$) with extra vector-like quarks transforming in the fundamental representation. When the heavy quarks are integrated out below the PQ-breaking scale, they generate an axion coupling which simultaneously solves the strong CP problem for both gauge groups. However, the axion mass now receives a new nonperturbative contribution from the SU($N^\prime$) confinement scale… 

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