Helicity fractions of W bosons from top quark decays at NNLO in QCD

Details Helicity fractions of W bosons from top quark decays at NNLO in QCD Helicity fractions of W bosons from top quark decays at NNLO in QCD

2010-05-14

arxiv.org/abs/1005.2625v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 1 figure

Scientific paper

Decay rates of unpolarized top quarks into longitudinally and transversally
polarized W bosons are calculated to second order in the strong coupling
constant alpha_s. Including the finite bottom quark mass and electroweak
effects, the Standard Model predictions for the W boson helicity fractions are
F_L=0.687(5), F_+=0.0017(1), and F_-=0.311(5).

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