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SUMMARY:Supersymmetric unification and R symmetries - Ratz\, M (Technische
  Universitt Mnchen)
DTSTART:20120626T083500Z
DTEND:20120626T091000Z
UID:TALK38661@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:After reviewing some virtues and problems of the minimal super
 symmetric standard model (MSSM)\, I will show that\, if one demands anomal
 y freedom and fermion masses\, only R symmetries can forbid the supersymme
 tric Higgs mass term mu. I will then prove that R symmetries are not avail
 able in conventional grand unified theories (GUTs) and argue that this pre
 vents natural solutions to the doublet-triplet splitting problem in four d
 imensions. On the other hand\, higher-dimensional GUTs do not suffer from 
 this problem. I will briefly discuss an explicit string-derived model in w
 hich the mu and dimension five proton decay problems are solved by an orde
 r four discrete R symmetry\, and comment on the higher-dimensional origin 
 of this symmetry.\n\n
LOCATION:Seminar Room 1\, Newton Institute
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