Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2000-09-25
Phys.Lett. B500 (2001) 286-296
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 LaTex pages, 3 Postscript figures
Scientific paper
10.1016/S0370-2693(00)01392-7
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 l\`a} 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 $\Lambda'$ of the mirror strong interactions has to be larger than the ordinary QCD scale $\Lambda$. In this way, the axion mass and interaction constants are actually determined by mirror sector scales $v'$ and $\Lambda'$, while the $\theta$ 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.
Berezhiani Zurab
Gianfagna Leonida
Giannotti Maurizio
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