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Limits on the Higgs boson mass restrict CKM mixing of a possible fourthfamily beyond the constraints previously obtained from precision electroweakdata alone. Existing experimental and theoretical bounds on the Higgs massalready significantly restrict the allowed parameter space. Zero CKM mixing isexcluded and mixing of order the Cabibbo angle is allowed. Upper and lowerlimits on 3-4 CKM mixing are exhibited as a function of the Higgs mass. We usethe default inputs of the Electroweak Working Group and also explore thesensitivity of both the three and four family fits to alternative inputs.

Higgs Mass Constraints on a Fourth Family: Upper and Lower Limits on CKM Mixing