In the supersymmetric grand unified theories (SUSY GUTs), gauge bosons associated with the unified gauge group induce proton decay. We investigate the proton decay rate via the gauge bosons in the SUSY GUTs under the two situations; one is with extra vector-like multiplets, and the other is with heavy sfermions. It is found that the proton lifetime is significantly reduced in the former case, while in the latter case it is slightly prolonged. Determination of the particle contents and their mass spectrum below the GUT scale is important to predict the proton lifetime. The proton decay searches have started to access to the 10 16GeV scale.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Oct 2 2012|
Bibliographical noteFunding Information:
We thank Yasumichi Aoki for useful discussion. This work is supported by Grant-in-Aid for Scientific research from the Ministry of Education, Science, Sports, and Culture (MEXT) , Japan, No. 20244037 , No. 20540252 , No. 22244021 and No. 23104011 (J.H.), and also by World Premier International Research Center Initiative (WPI Initiative), MEXT , Japan. The work of N.N. is supported by Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists .