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

Aaltonen T.
•
Álvarez González B.
•
Amerio S.
altro
Zucchelli S.
2013
  • journal article

Periodico
PHYSICS LETTERS. SECTION B
Abstract
We present a measurement of the W-boson polarization in top-quark decays in t tbar events with decays to dilepton final states using data corresponding to 5.1 fb(-1) of integrated luminosity in p pbar collisions collected by the CDF II detector at the Tevatron. Assuming a top-quark mass of 172.5 GeV/c(2), a simultaneous measurement of the fractions of longitudinal (f(0)) and right-handed (f(+)) W-bosons yields the results f(0) = 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 f(0) = 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.
DOI
10.1016/j.physletb.2013.03.032
WOS
WOS:000318745300004
Archivio
http://hdl.handle.net/11390/984948
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84876865961
Diritti
metadata only access
Scopus© citazioni
8
Data di acquisizione
Jun 7, 2022
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Web of Science© citazioni
3
Data di acquisizione
Mar 19, 2024
Visualizzazioni
3
Data di acquisizione
Apr 19, 2024
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