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We investigate a radiative correction to the masses of Kaluza-Klein(KK) modesin a universal extra dimensional model which are defined on a six-dimensionalspacetime with extra space as a two-sphere orbifold $S^2/Z_2$. We first definethe Feynman rules which are necessary for the calculation. We then calculatethe one-loop diagrams which contribute to the radiative corrections to the KKmasses, and obtain one-loop corrections to masses for fermions, gauge bosonsand scalar bosons. We estimate the one-loop corrections to KK masses for thefirst KK modes of standard model particles as a function of momentum cut-offscale, and we determine the lightest KK particle which would be a promisingcandidate of a dark matter.

One loop radiative correction to Kaluza-Klein masses in $S^2/Z_2$ universal extra dimensional model