We report the combination of recent measurements of the helicity of the W
boson from top quark decay by the CDF and D0 collaborations, based on data
samples corresponding to integrated luminosities of 2.7 - 5.4 fb^-1 of ppbar
collisions collected during Run II of the Fermilab Tevatron Collider. Combining
measurements that simultaneously determine the fractions of W bosons with
longitudinal (f0) and right-handed (f+) helicities, we find f0 = 0.722 pm
0.081 [pm 0.062 (stat.) pm 0.052 (syst.)] and f+ = -0.033 pm 0.046 [pm
0.034 (stat.) pm 0.031 (syst.)]. Combining measurements where one of the
helicity fractions is fixed to the value expected in the standard model, we
find f0 = 0.682 pm 0.057 [pm 0.035 (stat.) pm 0.046 (syst.)] and f+ =
-0.015pm0.035 [pm 0.018 (stat.) pm 0.030 (syst.)]. The results are
consistent with standard model expectations.
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