Mass hierarchies from MSSM orientifold compactifications
Abstract
We investigate phenomenologically viable four and fivestack MSSM Dbrane quivers which exhibit realistic fermion mass hierarchies. In our analysis, the mass hierarchies arise either from higher order terms containing the VEV’s of SM singlets or from Dinstanton effects, where the latter utilizes either family splitting or a factorizable Yukawa matrix. Extending the systematic bottomup analysis of [1], we present the only fourstack quiver with a semirealistic Yukawa texture. Investigation of fivestack MSSM models reveals many more quivers with analogous Yukawa textures, as well as a few examples which exhibit three different mass scales for the upquarks, downquarks, and electrons. Potential problems in this class of quivers are the presence of U(1) instantons, which might lead to undesired effects, such as Rparity violating couplings, and the presence of dimension 5 operators that could lead to rapid proton decay. We present a fivestack setup which overcomes all of these problems and exhibits three different mass scales for the upquarks, downquarks and electrons.
 Publication:

Journal of High Energy Physics
 Pub Date:
 July 2010
 DOI:
 10.1007/JHEP07(2010)005
 arXiv:
 arXiv:0909.4292
 Bibcode:
 2010JHEP...07..005C
 Keywords:

 Intersecting branes models;
 Dbranes;
 Superstring Vacua;
 High Energy Physics  Theory;
 High Energy Physics  Phenomenology
 EPrint:
 31 pages