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Measurement of W-boson helicity fractions in top-quark decays using cos θ*

Publication ,  Journal Article
Aaltonen, T; Adelman, J; Akimoto, T; Álvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Apresyan, A ...
Published in: Physics Letters Section B Nuclear Elementary Particle and High Energy Physics
April 20, 2009
Published version (DOI)

Fully reconstructed t over(t, ̄) → W+ b W- over(b, ̄) → ℓ ν q over(q, ̄)′ b over(b, ̄) events are used to determine the fractions of right-handed (f+) and longitudinally polarized (f0) W bosons produced in top-quark decays. The helicity fractions are sensitive to the couplings and the Dirac structure of the Wtb vertex. This Letter reports measurements of the W-boson helicity fractions from two different methods using data corresponding to an integrated luminosity of 1.9 fb- 1 of p over(p, ̄) collisions at a center-of-mass energy of 1.96 TeV collected by the CDF II detector operating at the Fermilab Tevatron. Combining the results from the two methods, we find f0 = 0.62 ± 0.10 (stat) ± 0.05 (syst) under the assumption that f+ = 0, and f+ = - 0.04 ± 0.04 (stat) ± 0.03 (syst) with f0 fixed to the theoretically expected value of 0.70. Model-independent fits are also performed and simultaneously determine f0 = 0.66 ± 0.16 (stat) ± 0.05 (syst) and f+ = - 0.03 ± 0.06 (stat) ± 0.03 (syst). All these results are consistent with standard model expectations. © 2009 Elsevier B.V.

Duke Scholars

Alfred T. Goshaw
Author Alfred T. Goshaw Physics
Ashutosh V. Kotwal
Author Ashutosh V. Kotwal Physics
Mark C. Kruse
Author Mark C. Kruse Physics
Seog Oh
Author Seog Oh Physics

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

10.1016/j.physletb.2009.02.040

ISSN

0370-2693

Publication Date

April 20, 2009

Volume

674

Issue

3

Start / End Page

160 / 167

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics
 

Citation

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Aaltonen, T., Adelman, J., Akimoto, T., Álvarez González, B., Amerio, S., Amidei, D., … Clark, D. (2009). Measurement of W-boson helicity fractions in top-quark decays using cos θ*. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, 674(3), 160–167. https://doi.org/10.1016/j.physletb.2009.02.040
Aaltonen, T., J. Adelman, T. Akimoto, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, et al. “Measurement of W-boson helicity fractions in top-quark decays using cos θ*.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics 674, no. 3 (April 20, 2009): 160–67. https://doi.org/10.1016/j.physletb.2009.02.040.
Aaltonen T, Adelman J, Akimoto T, Álvarez González B, Amerio S, Amidei D, et al. Measurement of W-boson helicity fractions in top-quark decays using cos θ*. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2009 Apr 20;674(3):160–7.
Aaltonen, T., et al. “Measurement of W-boson helicity fractions in top-quark decays using cos θ*.” Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, vol. 674, no. 3, Apr. 2009, pp. 160–67. Scopus, doi:10.1016/j.physletb.2009.02.040.
Aaltonen T, Adelman J, Akimoto T, Álvarez González B, Amerio S, Amidei D, Anastassov A, Annovi A, Antos J, Apollinari G, Apresyan A, Arisawa T, Artikov A, Ashmanskas W, Attal A, Aurisano A, Azfar F, Badgett W, Barbaro-Galtieri A, Barnes VE, Barnett BA, Barria P, Bartsch V, Bauer G, Beauchemin PH, Bedeschi F, Beecher D, Behari S, Bellettini G, Bellinger J, Benjamin D, Beretvas A, Beringer J, Bhatti A, Binkley M, Bisello D, Bizjak I, Blair RE, Blocker C, Blumenfeld B, Bocci A, Bodek A, Boisvert V, Bolla G, Bortoletto D, Boudreau J, Boveia A, Brau B, Bridgeman A, Brigliadori L, Bromberg C, Brubaker E, Budagov J, Budd HS, Budd S, Burke S, Burkett K, Busetto G, Bussey P, Buzatu A, Byrum KL, Cabrera S, Calancha C, Campanelli M, Campbell M, Canelli F, Canepa A, Carls B, Carlsmith D, Carosi R, Carrillo S, Carron S, Casal B, Casarsa M, Castro A, Catastini P, Cauz D, Cavaliere V, Cavalli-Sforza M, Cerri A, Cerrito L, Chang SH, Chen YC, Chertok M, Chiarelli G, Chlachidze G, Chlebana F, Cho K, Chokheli D, Chou JP, Choudalakis G, Chuang SH, Chung K, Chung WH, Chung YS, Chwalek T, Ciobanu CI, Ciocci MA, Clark A, Clark D. Measurement of W-boson helicity fractions in top-quark decays using cos θ*. Physics Letters Section B Nuclear Elementary Particle and High Energy Physics. 2009 Apr 20;674(3):160–167.
Journal cover image

Published In

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics

DOI

10.1016/j.physletb.2009.02.040

ISSN

0370-2693

Publication Date

April 20, 2009

Volume

674

Issue

3

Start / End Page

160 / 167

Related Subject Headings

  • Nuclear & Particles Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics
  • 0201 Astronomical and Space Sciences
  • 0105 Mathematical Physics