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. Barnes; B. 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

doi:10.1103/PhysRevLett.84.216

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

Physics and Astronomy (Twin Cities)

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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 language	English (US)
Pages (from-to)	216-221
Number of pages	6
Journal	Physical review letters
Volume	84
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevLett.84.216
State	Published - 2000

Bibliographical 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.

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Affolder, T., Akimoto, H., Akopian, A., Albrow, M. G., Amaral, P., Amendolia, S. R., Amidei, D., Antos, J., Apollinari, G., Arisawa, T., Asakawa, T., Ashmanskas, W., Atac, M., Azzi-Bacchetta, P., Bacchetta, N., Bailey, M. W., Bailey, S., de Barbaro, P., Barbaro-Galtieri, A., ... CDF Collaboration (2000). Measurement of the helicity of W bosons in top quark decays. Physical review letters, 84(2), 216-221. https://doi.org/10.1103/PhysRevLett.84.216

Affolder, T, Akimoto, H, Akopian, A, Albrow, MG, Amaral, P, Amendolia, SR, Amidei, D, Antos, J, Apollinari, G, Arisawa, T, Asakawa, T, Ashmanskas, W, Atac, M, Azzi-Bacchetta, P, Bacchetta, N, Bailey, MW, Bailey, S, de Barbaro, P, Barbaro-Galtieri, A, Barnes, VE, Barnett, BA, Barone, M, Bauer, G, Bedeschi, F, Belforte, S, Bellettini, G, Bellinger, J, Benjamin, D, Bensinger, J, Beretvas, A, Berge, JP, Berryhill, J, Bertolucci, S, Bevensee, B, Bhatti, A, Bigongiari, C, Binkley, M, Bisello, D, Blair, RE, Blocker, C, Bloom, K, Blumenfeld, B, Blusk, BS, Bocci, A, Bodek, A, Bokhari, W, Bolla, G, Bonushkin, Y, Bortoletto, D, Cronin-Hennessy, D & CDF Collaboration 2000, 'Measurement of the helicity of W bosons in top quark decays', Physical review letters, vol. 84, no. 2, pp. 216-221. https://doi.org/10.1103/PhysRevLett.84.216

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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 = "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 D. Cronin-Hennessy and {CDF Collaboration}",

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.",

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doi = "10.1103/PhysRevLett.84.216",

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T1 - Measurement of the helicity of W bosons in top quark decays

AU - Affolder, T.

AU - Akimoto, H.

AU - Akopian, A.

AU - Albrow, M. G.

AU - Amaral, P.

AU - Amendolia, S. R.

AU - Amidei, D.

AU - Antos, J.

AU - Apollinari, G.

AU - Arisawa, T.

AU - Asakawa, T.

AU - Ashmanskas, W.

AU - Atac, M.

AU - Azzi-Bacchetta, P.

AU - Bacchetta, N.

AU - Bailey, M. W.

AU - Bailey, S.

AU - de Barbaro, P.

AU - Barbaro-Galtieri, A.

AU - Barnes, V. E.

AU - Barnett, B. A.

AU - Barone, M.

AU - Bauer, G.

AU - Bedeschi, F.

AU - Belforte, S.

AU - Bellettini, G.

AU - Bellinger, J.

AU - Benjamin, D.

AU - Bensinger, J.

AU - Beretvas, A.

AU - Berge, J. P.

AU - Berryhill, J.

AU - Bertolucci, S.

AU - Bevensee, B.

AU - Bhatti, A.

AU - Bigongiari, C.

AU - Binkley, M.

AU - Bisello, D.

AU - Blair, R. E.

AU - Blocker, C.

AU - Bloom, K.

AU - Blumenfeld, B.

AU - Blusk, B. S.

AU - Bocci, A.

AU - Bodek, A.

AU - Bokhari, W.

AU - Bolla, G.

AU - Bonushkin, Y.

AU - Bortoletto, D.

AU - Cronin-Hennessy, D.

AU - CDF Collaboration

N1 - 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.

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevLett.84.216

M3 - Article

AN - SCOPUS:85028209195

SN - 0031-9007

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SP - 216

EP - 221

JO - Physical review letters

JF - Physical review letters

IS - 2

ER -

Measurement of the helicity of W bosons in top quark decays

Abstract

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