Bounding CKM Mixing with a Fourth Family

Details Bounding CKM Mixing with a Fourth Family Bounding CKM Mixing with a Fourth Family

2009-04-22

arxiv.org/abs/0904.3570v2

Phys.Rev.D79:113008,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 3 figures: added references, minor revisions

Scientific paper

10.1103/PhysRevD.79.113008

CKM mixing between third family quarks and a possible fourth family is constrained by global fits to the precision electroweak data. The dominant constraint is from nondecoupling oblique corrections rather than the Zbb vertex correction used in previous analyses. The possibility of large mixing suggested by some recent analyses of FCNC processes is excluded, but 3-4 mixing of the same order as the Cabbibo mixing of the first two families is allowed.

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