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Advances in High Energy Physics
Volume 2015, Article ID 652029, 8 pages
Research Article

Effects of the Variation of SUSY Breaking Scale on Yukawa and Gauge Couplings Unification

1Department of Physics, Gauhati University, Guwahati 781014, India
2Department of Physics, Manipur University, Canchipur, Imphal 795003, India

Received 28 February 2015; Accepted 6 May 2015

Academic Editor: Emil Bjerrum-Bohr

Copyright © 2015 Konsam Sashikanta Singh and N. Nimai Singh. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. The publication of this article was funded by SCOAP3.


The present analysis addresses an interesting primary question on how do the gauge and Yukawa couplings unification scales vary with varying SUSY breaking scales , assuming a single scale for all supersymmetric particles. It is observed that the gauge coupling unification scale increases with whereas third-generation Yukawa couplings unification scale decreases with . The rising of the unification scale and also the mass of the color triplet multiplets is necessary to increase the proton decay lifetime; the analysis is carried out with two-loop RGEs for the gauge and Yukawa couplings within the minimal supersymmetric SU(5) model, while ignoring for simplicity the threshold effects of the heavy particles, which could be as large as a few percentages.