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We present an analysis of two-loop mixed QCD and electroweak corrections tothe decay of the Z boson into light quarks. We find that the naivefactorization of QCD and electroweak corrections does not describe correctlythe two-loop effects. The nonfactorizable corrections shift the width of the Zboson by approximately -0.55(3) MeV and increase the central value of thestrong coupling constant determined at LEP by 0.001.Comment: 9 pages, Revte

physical review letters

Nonfactorizable QCD and Electroweak Corrections to the Hadronic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">Z</mml:mi></mml:math>Boson Decay Rate

Nonfactorizable QCD and Electroweak Corrections to the HadronicZBoson Decay Rate