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We investigate the radiative process of the $\Lambda_b\rightarrow \Lambda\gamma$ in the standard model as well as models with one or two compactuniversal extra dimensions. Using the form factors entered to the low energymatrix elements, calculated via light cone QCD in full theory, we calculate thetotal decay width and branching ratio of this decay channel. We compare theresults of the extra dimensional models with those of the standard model on theconsidered physical quantities and look for the deviations of the results fromthe standard model predictions at different values of the compactificationscale (1/R).

Analysis of the radiative $\Lambda_b\rightarrow \Lambda \gamma$ transition in SM and scenarios with one or two universal extra dimensions