We present a measurement of the W-boson polarization in top-quark decays in t (t) over bar events with decays to dilepton final states using data corresponding to 5.1 fb(-1) of integrated luminosity in p (p) over bar 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. (C) 2013 Elsevier B.V. All rights reserved.

T., A., B. A., G., S., A., D., A., A., A., A., A., et al. (2013). W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector. PHYSICS LETTERS. SECTION B, 722(1-3), 48-54 [10.1016/j.physletb.2013.03.032].

W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector

BARRIA, PATRIZIA;GAROSI, PAOLA;MAESTRO, PAOLO;RUFFINI, FABRIZIO;SCRIBANO, ANGELO;SQUILLACIOTI, PAOLA;
2013-01-01

Abstract

We present a measurement of the W-boson polarization in top-quark decays in t (t) over bar events with decays to dilepton final states using data corresponding to 5.1 fb(-1) of integrated luminosity in p (p) over bar 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. (C) 2013 Elsevier B.V. All rights reserved.
2013
T., A., B. A., G., S., A., D., A., A., A., A., A., et al. (2013). W-boson polarization measurement in the t(t)over-bar dilepton channel using the CDF II detector. PHYSICS LETTERS. SECTION B, 722(1-3), 48-54 [10.1016/j.physletb.2013.03.032].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/45612
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