@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",
note = "Funding Information: We thank the Fermilab staff and the technical staffs of the participating institutions for their vital contributions. This work is supported by the U.S. Department of Energy and the National Science Foundation, the Natural Sciences and Engineering Research Council of Canada, the Istituto Nazionale di Fisica Nucleare of Italy, the Ministry of Education, Science and Culture of Japan, the National Science Council of the Republic of China, and the A. P. Sloan Foundation.",
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",
}