# 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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Abstract
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