Measurement of the helicity of W bosons in top quark decays

T. Affolder, H. Akimoto, A. Akopian, M. G. Albrow, P. Amaral, S. R. Amendolia, D. Amidei, J. Antos, G. Apollinari, T. Arisawa, T. Asakawa, W. Ashmanskas, M. Atac, P. Azzi-Bacchetta, N. Bacchetta, M. W. Bailey, S. Bailey, P. de Barbaro, A. Barbaro-Galtieri, V. E. BarnesB. A. Barnett, M. Barone, G. Bauer, F. Bedeschi, S. Belforte, G. Bellettini, J. Bellinger, D. Benjamin, J. Bensinger, A. Beretvas, J. P. Berge, J. Berryhill, S. Bertolucci, B. Bevensee, A. Bhatti, C. Bigongiari, M. Binkley, D. Bisello, R. E. Blair, C. Blocker, K. Bloom, B. Blumenfeld, B. S. Blusk, A. Bocci, A. Bodek, W. Bokhari, G. Bolla, Y. Bonushkin, D. Bortoletto, D. Cronin-Hennessy, CDF Collaboration

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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 tt̄ sample isolated in 106±4pb-1 of data collected in pp̄ 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.

Original languageEnglish (US)
Pages (from-to)216-221
Number of pages6
JournalPhysical review letters
Volume84
Issue number2
DOIs
StatePublished - 2000

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