Upper Bound on the Proton Lifetime and the Minimal Non-SUSY Grand Unified Theory

Abstract

In this talk we show that it is possible to find an upper bound on the total proton lifetime. We conclude that the minimal realistic non-supersymmetric grand unified theory is the modified Georgi-Glashow model with a Higgs sector composed of 5_H, 24_H, and 15_H. We discuss the possibility to test this scenario at the next generation of proton decay experiments and future colliders through the production of light scalar leptoquarks.

Comments: 8 pages. Based on the Talks given at NURT'06 (V International Symposium on Nuclear and Related Techniques, Havana, CUBA, 3-7 April 2006), PLANCK'06 (The ninth European meeting "From the Planck scale to the ElectroWeak scale", Paris, FRANCE, 29 May 29 - 2 June,2006) and SUSY'06 (14th International Conference on Supersymmetry and the Unification of Fundamental Interactions. Irvine, California, USA. 12-17 June 2006)