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We calculate the full one-loop electroweak (FEW) corrections to$H^-\to\widetilde{\chi}^-_1\widetilde{\chi}^0_i$ in the minimal supersymmetricstandard model (MSSM), and compare with the leading order (LO) correctionsincluding the loops of the (s)quarks only in the third generation and thecomplete leading order (CLO) corrections including the loops of the (s)quarksin all the three generations. We find that the magnitudes of the FEWcorrections can be larger than 10% for $\tan\beta>30$. Moreover, comparing withthe FEW corrections, both of the LO and the CLO corrections are negligiblesmall for the mode 1($H^-\to\widetilde{\chi}^-_1\widetilde{\chi}^0_1$) when$\tan\beta<5$, and for the mode2($H^-\to\widetilde{\chi}^-_1\widetilde{\chi}^0_2$) when $\tan\beta>45$,respectively, since there are not enhancements from the Yukawa couplings. Wealso calculate the FEW corrections in the minimal supergravity (mSUGRA)scenario, where the FEW corrections can be larger than the LO and the CLOcorrections by more than 60% and 50%, respectively.Comment: 38 pages, 18 figures, revised version, to appear in Phys. Rev.

Full one-loop electroweak corrections to the charged Higgs decays into a chargino and neutralino in the MSSM