In this chiral U(1)_{B-L} axion model, demanding high axion quality forces a minimal axion-electron coupling that can exceed standard KSVZ-model predictions.
Using the cubic equation (16), one obtains CB−L≥max m2 + 3 4 , n2 + 3 4 .(19) The analysis above does not fully account for the integer nature of the solutionsa j andb j
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A quality-coupling relation in chiral $U(1)_{B-L}$ axion model
In this chiral U(1)_{B-L} axion model, demanding high axion quality forces a minimal axion-electron coupling that can exceed standard KSVZ-model predictions.