1993/08/31 by Edi Halyo
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/0370-2693(93)90460-y
published as Phys.Lett. B318 (1993) 597-603 · 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 the global symmetry is clarified.)
arxiv created 1993/09/12 · openalex publication_date 1993/12/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
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 Z2 twisted sectors which use a Z4 twist.