@article{d8d7096571fc4e219614215c4a0249f7,
title = "Measurement of the helicity of W bosons in top quark decays",
abstract = "We use the transverse momentum spectrum of leptons in the decay chain t→bW with W→lv to measure the helicity of the W bosons in the top quark rest frame. Our measurement uses a t{\=t} sample isolated in 106±4pb-1 of data collected in p{\=p} collisions at √s=1.8TeV with the CDF detector at the Fermilab Tevatron. Assuming a standard V-A weak decay, we find that the fraction of W's with zero helicity in the top rest frame is F0=0.91±0.37(stat)±0.13(syst), consistent with the standard model prediction of F0=0.70 for a top mass of 175GeV/c2.",
author = "{CDF Collaboration} and T. Affolder and H. Akimoto and A. Akopian and Albrow, {M. G.} and P. Amaral and Amendolia, {S. R.} and D. Amidei and J. Antos and G. Apollinari and T. Arisawa and T. Asakawa and W. Ashmanskas and M. Atac and P. Azzi-Bacchetta and N. Bacchetta and Bailey, {M. W.} and S. Bailey and {de Barbaro}, P. and A. Barbaro-Galtieri and Barnes, {V. E.} and Barnett, {B. A.} and M. Barone and G. Bauer and F. Bedeschi and S. Belforte and G. Bellettini and J. Bellinger and D. Benjamin and J. Bensinger and A. Beretvas and Berge, {J. P.} and J. Berryhill and S. Bertolucci and B. Bevensee and A. Bhatti and C. Bigongiari and M. Binkley and D. Bisello and Blair, {R. E.} and C. Blocker and K. Bloom and B. Blumenfeld and Blusk, {B. S.} and A. Bocci and A. Bodek and W. Bokhari and G. Bolla and Y. Bonushkin and D. Bortoletto and J. Olsen",
year = "2000",
doi = "10.1103/PhysRevLett.84.216",
language = "English (US)",
volume = "84",
pages = "216--221",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "2",
}