Yukawa radiative corrections to the triple self-couplings of neutral CP-even Higgs bosons and to the H → hh decay rate within the minimal supersymmetric standard model

Within the minimal supersymmetric standard model, four self-couplings,lambda(hhh), lambda(hhH), lambda(hHH), and lambda(HHH), and the decay rate Gamma(H -> hh) are calculated with allowance for one-loop corrections induced by the contribution of the t, b, and c quarks, the Gamma lepton, and the corresponding superpartners and with the aid of the on-shell renormalization scheme. An analysis of the dependences of these features on tan beta and the mass of the A Higgs boson, MA, shows that, in a specific region of the model-parameter space, the calculated corrections can make a significant contribution to the couplings and decay rate in the one-loop approximation. The inclusion of the radiative corrections in question is mandatory in reconstructing the Higgs potential.