W-boson polarization measurement in the tt- dilepton channel using the CDF II detector

CDF Collaboration

doi:10.1016/j.physletb.2013.03.032

W-boson polarization measurement in the tt- dilepton channel using the CDF II detector

CDF Collaboration

Department of Physics

University of Helsinki
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Fermi National Accelerator Laboratory
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National Institute for Nuclear Physics
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Abstract

We present a measurement of the W-boson polarization in top-quark decays in tt- events with decays to dilepton final states using data corresponding to 5.1 fb^-1 of integrated luminosity in pp- collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c², a simultaneous measurement of the fractions of longitudinal ( f₀) and right-handed ( f₊) W-bosons yields the results f₀ = 0.70_-0.17 ^+0.18 (stat) ± 0.06(syst) and f₊ =-0.09 ± 0.09(stat) ± 0.03(syst). Combining this measurement with our previous measurement based on single-lepton final states, we obtain f₀ = 0.84 ± 0.09(stat) ± 0.05(syst) and f₊ =-0.16 ± 0.05(stat) ± 0.04(syst). The results are consistent with the standard model expectation.

Original language	English
Pages (from-to)	48-54
Number of pages	7
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	722
Issue number	1-3
DOIs	https://doi.org/10.1016/j.physletb.2013.03.032
State	Published - 13 May 2013

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@article{281c42249ed74d298e0f6ad550319d83,

title = "W-boson polarization measurement in the tt- dilepton channel using the CDF II detector",

abstract = "We present a measurement of the W-boson polarization in top-quark decays in tt- events with decays to dilepton final states using data corresponding to 5.1 fb-1 of integrated luminosity in pp- collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c2, a simultaneous measurement of the fractions of longitudinal ( f0) and right-handed ( f+) W-bosons yields the results f0 = 0.70-0.17 +0.18 (stat) ± 0.06(syst) and f+ =-0.09 ± 0.09(stat) ± 0.03(syst). Combining this measurement with our previous measurement based on single-lepton final states, we obtain f0 = 0.84 ± 0.09(stat) ± 0.05(syst) and f+ =-0.16 ± 0.05(stat) ± 0.04(syst). The results are consistent with the standard model expectation.",

author = "\{CDF Collaboration\} and T. Aaltonen and \{{\'A}lvarez Gonz{\'a}lez\}, B. and S. Amerio and D. Amidei and A. Anastassov and A. Annovi and J. Antos and G. Apollinari and Appel, \{J. A.\} and T. Arisawa and A. Artikov and J. Asaadi and W. Ashmanskas and B. Auerbach and A. Aurisano and F. Azfar and W. Badgett and T. Bae and A. Barbaro-Galtieri and Barnes, \{V. E.\} and Barnett, \{B. A.\} and P. Barria and P. Bartos and M. Bauce and F. Bedeschi and S. Behari and G. Bellettini and J. Bellinger and D. Benjamin and A. Beretvas and A. Bhatti and D. Bisello and I. Bizjak and Bland, \{K. R.\} and B. Blumenfeld and A. Bocci and A. Bodek and D. Bortoletto and J. Boudreau and A. Boveia and L. Brigliadori and C. Bromberg and E. Brucken and J. Budagov and Budd, \{H. S.\} and K. Burkett and G. Busetto and P. Bussey and A. Buzatu and Lee, \{J. S.\}",

year = "2013",

month = may,

day = "13",

doi = "10.1016/j.physletb.2013.03.032",

language = "English",

volume = "722",

pages = "48--54",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier B.V.",

number = "1-3",

}

TY - JOUR

T1 - W-boson polarization measurement in the tt- dilepton channel using the CDF II detector

AU - CDF Collaboration

AU - Aaltonen, T.

AU - Álvarez González, B.

AU - Amerio, S.

AU - Amidei, D.

AU - Anastassov, A.

AU - Annovi, A.

AU - Antos, J.

AU - Apollinari, G.

AU - Appel, J. A.

AU - Arisawa, T.

AU - Artikov, A.

AU - Asaadi, J.

AU - Ashmanskas, W.

AU - Auerbach, B.

AU - Aurisano, A.

AU - Azfar, F.

AU - Badgett, W.

AU - Bae, T.

AU - Barbaro-Galtieri, A.

AU - Barnes, V. E.

AU - Barnett, B. A.

AU - Barria, P.

AU - Bartos, P.

AU - Bauce, M.

AU - Bedeschi, F.

AU - Behari, S.

AU - Bellettini, G.

AU - Bellinger, J.

AU - Benjamin, D.

AU - Beretvas, A.

AU - Bhatti, A.

AU - Bisello, D.

AU - Bizjak, I.

AU - Bland, K. R.

AU - Blumenfeld, B.

AU - Bocci, A.

AU - Bodek, A.

AU - Bortoletto, D.

AU - Boudreau, J.

AU - Boveia, A.

AU - Brigliadori, L.

AU - Bromberg, C.

AU - Brucken, E.

AU - Budagov, J.

AU - Budd, H. S.

AU - Burkett, K.

AU - Busetto, G.

AU - Bussey, P.

AU - Buzatu, A.

AU - Lee, J. S.

PY - 2013/5/13

Y1 - 2013/5/13

N2 - We present a measurement of the W-boson polarization in top-quark decays in tt- events with decays to dilepton final states using data corresponding to 5.1 fb-1 of integrated luminosity in pp- collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c2, a simultaneous measurement of the fractions of longitudinal ( f0) and right-handed ( f+) W-bosons yields the results f0 = 0.70-0.17 +0.18 (stat) ± 0.06(syst) and f+ =-0.09 ± 0.09(stat) ± 0.03(syst). Combining this measurement with our previous measurement based on single-lepton final states, we obtain f0 = 0.84 ± 0.09(stat) ± 0.05(syst) and f+ =-0.16 ± 0.05(stat) ± 0.04(syst). The results are consistent with the standard model expectation.

AB - We present a measurement of the W-boson polarization in top-quark decays in tt- events with decays to dilepton final states using data corresponding to 5.1 fb-1 of integrated luminosity in pp- collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c2, a simultaneous measurement of the fractions of longitudinal ( f0) and right-handed ( f+) W-bosons yields the results f0 = 0.70-0.17 +0.18 (stat) ± 0.06(syst) and f+ =-0.09 ± 0.09(stat) ± 0.03(syst). Combining this measurement with our previous measurement based on single-lepton final states, we obtain f0 = 0.84 ± 0.09(stat) ± 0.05(syst) and f+ =-0.16 ± 0.05(stat) ± 0.04(syst). The results are consistent with the standard model expectation.

UR - https://www.scopus.com/pages/publications/84876865961

U2 - 10.1016/j.physletb.2013.03.032

DO - 10.1016/j.physletb.2013.03.032

M3 - Article

AN - SCOPUS:84876865961

SN - 0370-2693

VL - 722

SP - 48

EP - 54

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 1-3

ER -

W-boson polarization measurement in the tt- dilepton channel using the CDF II detector

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