Proton lifetime is believed to be comparable to the lifetime of the
universe. What is the most recent experimental numbers of
proton lifetime ? What are the unified models which are ruled
out by the latest data of proton lifetime ?
Perhaps this would help, from 2006: http://arxiv.org/abs/hep-ph/0601023. http://pdg.lbl.gov/2008/tables/rpp2008-tab-baryons-N.pdf lists the proton partial mean life at 10^30 years. Also see http://arxiv.org/abs/0903.0676.
This was a very hot topic but about 20-30 years ago. The only result of these searches was a lower limit on the proton lifetime, which was quite discouraging to continue experiments on this subject. Most of these experiments were converted into the dark matter searches. Some theoretical studies ( https://journals.aps.org/prd/abstract/10.1103/PhysRevD.72.095003) of the lepton and baryon number violation were also quite pessimistic concerning a chance to detect such processes at the LHC. So up to my knowledge there are no new developments in this field.
Proton decay can be forbidden in extra dimensional models of
coupling unification. An interesting model is given by Kawamura.
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