Can the Axions of Standard--like Superstring Models Solve the Strong CP Problem?

Details Can the Axions of Standard--like Superstring Models Solve the Strong CP Problem? Can the Axions of Standard--like Superstring Models Solve the Strong CP Problem?

1993-08-03

arxiv.org/abs/hep-ph/9308211v2

Phys.Lett. B318 (1993) 597-603

Physics

High Energy Physics

High Energy Physics - Phenomenology

WIS-93/66/JUL-PH, 13 pages in Phyzzx.Tex and 1 table in Tables.Tex. (Axion mixing is taken into account and the point about th

Scientific paper

10.1016/0370-2693(93)90460-Y

We find that there are three axions in standard--like superstring models in
the four dimensional free fermionic formulation. These axions are either
harmful or very heavy. Therefore, they cannot solve the strong CP problem. We
show that this is a general result in superstring models with chiral
generations from the $Z_2$ twisted sectors which use a $Z_4$ twist.

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