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Strong CP problem and mirror world: the Weinberg Wilczek axion revisited

Zurab Berezhiani·Leonida Gianfagna·Maurizio Giannotti
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Abstract

A new possibility for solving the strong CP-problem is suggested,which assumes that apart of the ordinary world of observable particles described by standard model, there exits a mirror sector of particles and two sectors share the same Peccei-Quinn symmetry realized {\it a là} Weinberg-Wilczek model. The mirror gauge group is completely analogous to that of the standard model for ordinary particles but having somewhat larger electroweak scale,which in turn implies the infrared scale $Λ'$ of the mirror strong interactions has to be larger than the ordinary QCD scale $Λ$. In this way, the axion mass and interaction constants are actually determined by mirror sector scales $v'$ and $Λ'$, while the $θ$ terms are simultaneously cancelled in both sectors due to mirror symmetry. The experimental and astrophysical limits on such an axion is discussed. An interesting parameter window is found where $f_a \sim {\rm few}\times 10^4$ GeV whereas the axion mass is $\sim 1$ MeV.

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Zurab Berezhiani, Leonida Gianfagna, Maurizio Giannotti. 2001-01-29. Strong CP problem and mirror world: the Weinberg Wilczek axion revisited. https://doi.org/10.1016/s0370-2693(00)01392-7

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