# Possible large mass effects in direct determination of the CKM elements in top decays Academic Article

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• Overview
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• Research
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• We discuss the possibility that mass effects, beyond phase space, may have substantial influence on the direct determination of ${V}_{\mathrm{tq}}$ in decays of top quarks. In principle, our considerations are valid both for singly produced top and for $t\overline{t}$ pair production. The mass effect is practically irrelevant for the extraction of ${V}_{\mathrm{tb}}$ from Fermilab Tevatron data, but it may have implications for higher energy multijet top decay.