Evidence for unification of couplings

metroplex021
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Hi there - I'm looking for a reference on the issue of whether the three fundamental couplings unify. The most recent reference I have is from 1993, at which time it looked like the odds were against unification, but does anyone know a more recent reference? Thanks!
 
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The usual claim is that the couplings fail to unify in the standard model, but they do in the MSSM.
 

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