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In supersymmetric theories, the top quark can decay into its scalar partnerplus a neutralino, with an appreciable rate. We calculate the $O(\alpha_s)$ QCDcorrections to this decay mode in the minimal supersymmetric extension of theStandard Model. These corrections can be either positive or negative andincrease logarithmically with the gluino mass. For gluino masses below 1 TeV,they are at most of the order of ten percent and therefore, well under control.Comment: 15 pages including 4 figs (using psfig.sty). A few typos have been  corrected and some references added. The results for Figs. 3 and 4 are now  presented in the dimensional reduction scheme. Version to appear in Phys.  Rev.

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

QCD corrections to the top quark decay mode<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>t</mml:mi><mml:mo>→</mml:mo><mml:mrow><mml:mrow><mml:mover><mml:mrow><mml:mi>t</mml:mi></mml:mrow><mml:mrow><mml:mi>̃</mml:mi></mml:mrow></mml:mover></mml:mrow></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mi>χ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>

QCD corrections to the top quark decay modet→t̃χ0