Editing Proton decay (section)

== Projected proton lifetimes ==
{| class="wikitable"
|-
! Theory class
! Proton lifetime (years)<ref>{{Cite journal |last1=Bueno |first1=Antonio |last2=Melgarejo |first2=Antonio J |last3=Navas |first3=Sergio |last4=Dai |first4=Zuxiang |last5=Ge |first5=Yuanyuan |last6=Laffranchi |first6=Marco |last7=Meregaglia |first7=Anselmo |last8=Rubbia |first8=André |date=2007-04-11 |title=Nucleon decay searches with large liquid Argon TPC detectors at shallow depths: atmospheric neutrinos and cosmogenic backgrounds |url=http://stacks.iop.org/1126-6708/2007/i=04/a=041?key=crossref.289d2df8e7c5228ed3c2136a08194b62 |journal=Journal of High Energy Physics |volume=2007 |issue=4 |pages=041 |doi=10.1088/1126-6708/2007/04/041 |issn=1029-8479|arxiv=hep-ph/0701101 |bibcode=2007JHEP...04..041B |s2cid=119426496 }}</ref>
! Ruled out experimentally?
|-
| Minimal SU(5) ([[Georgi–Glashow model|Georgi–Glashow]])
| 10<sup>30</sup>–10<sup>31</sup>
| {{success|Yes}}
|-
| Minimal [[Supersymmetry|SUSY]] SU(5)
| 10<sup>28</sup>–10<sup>32</sup>
| {{success|Yes}}
|-
| [[Supergravity|SUGRA]] SU(5)
| 10<sup>32</sup>–10<sup>34</sup>
| {{success|Yes}}
|-
| SUSY [[SO(10)]]
| 10<sup>32</sup>–10<sup>35</sup>
| {{partial success|Partially}}
|-
| SUSY SU(5) ([[Minimal Supersymmetric Standard Model|MSSM]])
| ~10<sup>34</sup>
| {{partial success|Partially}}
|-
| SUSY SU(5) – 5 dimensions
| 10<sup>34</sup>–10<sup>35</sup>
| {{partial success|Partially}}
|-
| SUSY SO(10) MSSM G(224)
| {{val|2|e=34}}
| {{failure|No}}
|-
| Minimal (Basic) SO(10) – Non-SUSY
| < ~10<sup>35</sup> (maximum range)
| {{failure|No}}
|-
| [[Flipped SU(5)]] (MSSM)
| 10<sup>35</sup>–10<sup>36</sup>
| {{failure|No}}
|-
|}

The lifetime of the proton in vanilla SU(5) can be naively estimated as <math display="inline">\tau_p\sim M_X^4/m_p^5 </math>.<ref>{{cite journal |last1=Chanowitz |first1=Michael S. |last2=Ellis |first2=John |last3=Gaillard |first3=Mary K. |title=The price of natural flavour conservation in neutral weak interactions |journal=Nuclear Physics B |date=3 October 1977 |volume=128 |issue=3 |pages=506–536 |doi=10.1016/0550-3213(77)90057-8 |issn=0550-3213|bibcode=1977NuPhB.128..506C |s2cid=121007369 |url=https://cds.cern.ch/record/878518 }}</ref>  Supersymmetric GUTs with reunification scales around {{math|µ ~}}&nbsp;{{val|2e16|ul=GeV/c2}} yield a lifetime of around {{val|e=34|u=yr}}, roughly the current experimental lower bound.