[SLAC] [SLAC Pubs and Reports]

SLAC-PUB-7761
Fermion Mass Hierarchy without Flavour Symmetry

Abstract

We discuss a supersymmetric grand unified model which has gauge group SU(5) $\times$ SU(5) $\times$ SU(5), with matter fields transforming asymmetrically under different gauge SU(5) groups. We observe that the gauge structure of the model leads to approximate texture zero structures in fermion mass matrices and a natural hierarchy in the Yukawa couplings. The proton lifetime is estimated to be larger than $10^{34}$ years in this model. As in more conventional supersymmetric GUT models with product gauge groups, this model possesses no tensor fields with rank higher than 2, so that it might arise from a level 1 string construction.

(Equations render on Windows, Mac OS, AIX, Linux, Solaris, and IRIX with the techexplorer plug-in.)

Full Text

PDF

Compressed PostScript

techexplorer

Notes

The PDF version of this document was distilled from a PostScript file created from LaTeX source which may have used Type 3 fonts. The resultant PDF may be unreadable on the screen at the default viewing magnification, though the fonts will be legible at slightly higher magnifications.

Despite the cosmetic problems resulting from the Type 3 fonts, such PDF files print without problems; likewise, the onscreen text is searchable and selectable.

More Information

Full bibliographic data for this document, including its complete author list, is (or soon will be) available from SLAC's SPIRES-HEP Database.

Please report problems with this file to posting@slac.stanford.edu. The SLAC preprint inventory is provided by the SLAC Technical Publications Department.
Page generated 04 Apr 2001 @ 15:08 PDT by htmlme.pl